Baby Clark (Kal-El) arrives on Earth. Teen Clark starts high school, saves Lex's life after a car accident, and finds out about his past and birth parents.

Bug-lover Greg has an accident involving meteor rocks and his own insect collection, giving him creepy insect characteristics and powers. Lana is endangered when Greg decides that she is the perfect mate to start a colony.

When Coach Walt Arnold's football legacy is threatened by a cheating scandal, the coach entices Clark onto the team. Meteor Rocks in the coach's sauna infects him with the ability to generate fire, and his enemies start getting burned.

Clark discovers that he has X-ray vision, but struggles to use it properly. Meanwhile, shape-shifter Tina Greer robs a bank impersonating Lex Luthor, and then decides that she wants to become Lana Lang - permanently.

Obnoxious athlete Sean Kelvin drowns in an icy, Meteor Rock-infested lake, and is resurrected with an intense need for body heat. He freezes his old girlfriend to death and sets his sights on Chloe.

Lana befriends Harry, an elderly murderer living incognito in a nursing home. He falls into a Meteor Rock pond and regains his youth. Harry starts killing descendants of the jurors who convicted him, one of whom was Jonathan Kent's father.

Overweight teen Jodi submits to a diet of meteor-infected vegetables from her father's greenhouse. They magically make her thin, but she has an intense craving for body fat. Anyone in her vicinity is in danger, including her date, Pete.

Earl Jenkins claims that his violent shaking disease was a result of illicit experiments on Level 3 of Luthorcorp. Lionel denies that it exists, so Earl takes a plant tour group hostage. Lex offers himself in exchange for the hostages.

Corrupt detective Sam Phelan learns about Clark's abilities, and he offers to keep quiet if Clark steals some internal police files. When Clark refuses, Phelan frames Jonathan for murder to extort Clark into stealing from Luther Corp.

Lex and his girlfriend, Victoria, are attacked by an invisible entity. Suspicion falls upon the Palmer family, who are caretakers at Lex's mansion. Chloe believes that daughter Anna Palmer is responsible because of her jealousy of Victoria.

Bob Rickman is an evil businessman with a supernatural power of persuasion, which he uses to buy the Kent farm despite Jonathan's repeated refusals. Clark recruits Rickman's reclusive former business partner to help undo the damage.

Clark and classmate Eric Summer are both struck by lightning while Eric is holding a meteor rock, and Clark's powers are transferred to Eric. While Clark experiences normal humanity, the emotionally challenged Eric goes on a rampage.

Depressed from losing his scholarship, Whitney joins a gang of thieves. He gets a meteor rock-laced tattoo and gains the gang's power of phasing through walls. They rob Luthor mansion and seriously injure Chloe, who is interviewing Lex.

As Lex helps Lana prepare for the re-opening of the Smallville theater, The Talon, as a coffee shop, a man from Lex's past, named Jude Royce, arrives in town and begins stalking Lex wanting to hold him in conjunction with a shooting death at Club Zero in Metropolis three years ago that Lex may have been responsible for. Meanwhile, Chloe looks into Clark's past as an adopted child while Martha and Jonathan try to thwart Chloe's moves.

After stealing an experimental flower laced with meteor-rock pollen from Dr. Steven Hamilton, the employee of the Luthor Corp, James Beales has a truck accident on the road and is rescued by Jonathan Kent. However, the flower releases its pollen on Jonathan's face, and he unleashes his innermost repressed desires first with Martha and his anger towards the Luthors. He enters in coma later. Then Lana becomes affected and tries to seduce Clark. Pete also becomes affected by the Nicodemus flower in the same way. While Clark helps Lex track down the source, Lex hides from Clark that Dr. Steven Hamilton is working for him, but they find the cure in an old book.

Martha Kent injures mind-reading Ryan in an auto accident, and he fakes amnesia to get away from his criminal step-parents. His step-parents hatch an elaborate plan to steal him back and use his abilities to rob Lex Luthor.

Meteor fragments resurrect a young man with the ability to suck the life out of suffering people. He learns about Whitney's sick father and targets him for euthanasia.

Along the dispute of an election of the president in Smallville High School, candidate Paul Chan is severely injured by a swarm of bees. Pete decides to promote Clark Kent as the substitute for the spot. When the other aspirant schoolmate, Felice Chandler, is also attacked by bees, Clark believes that last competitor, Sasha Woodman, who has the meteor-rock ability to control bees, is behind the attacks. Meanwhile, Lex Luthor is threatened by an opportunist and ambitious reporter from Metropolis, named Carrie Castle, over some dark secrets of his that she's investigating. Also, The Talon, the thematic coffee shop where Lana works, is completely empty, losing clients to the competition; with the threat of closing the doors, Clark turns to Lex to ask for help to keep it open for Lana's sake.

After Justin Gaines romances Chloe, she learns that he has telekinesis ability. Clark angers Chloe by speculating that Justin is responsible for some mysterious accidents, to get revenge for his own hit-and-run injuries.

Lana develops a form of clairvoyance after being injured by an explosion, and she has visions of the activity of a local serial kidnapper and killer. When Chloe is kidnapped, Clark must rely on clues from Lana's visions to save her.

Lex and Lionel engage in a struggle over closing down the fertilizer plant. Reporter Roger Nixon steals Clark's spacecraft and learns his secret. Whitney joins the Marines, and Clark takes Chloe to the prom, while a huge tornado approaches.

Clark saves Lana from the tornado, leading Lana to be suspicious of Clark. While protecting Clark's secret, Jonathan gets trapped with reporter Roger Nixon in an underground mausoleum. Lex and Clark search for Jonathan.

When the "hot" new Biology teacher Desiree Atkins (Krista Allen) arrives in Smallville, Clark Kent gets excited in her presence and his hormonal surge sets off a new ability: heat vision. Lex Luthor meets and falls for Atkins and they decide to get married. Meanwhile, Clark's heat vision causes another fire at The Talon when Clark is talking with Lana, leading Clark to get briefly jailed on suspicions of arson. Lex invites Clark to be his best man, but when Desiree tries to seduce Clark, he realizes that she is a meteor freak with the power to seduce men.

When Dr. Steven Hamilton, physically sick from repeated exposure to meteor rock radiation, causing constant Parkinson-like twitches, becomes a liability to Lex Luthor, he terminates their contract. Dr. Hamilton leaves the mansion and drives down the road like a lunatic and causes a serious accident with a truck driven by Ray Wallace. The truck overturns in a cornfield near Clark Kent's spacecraft and, while trying to rescue Ray, Pete Ross sees the UFO. The next morning, Pete asks Clark to help him to bring the object to his workshop. When Dr. Hamilton steals the spacecraft, Pete believes Clark has taken it, so Clark discloses his secret to his friend. Meanwhile, the now blind Lionel Luthor moves into Lex's mansion forcing Lex to care for him. Also, to Lana's dismay, her aunt Nell Potter is in love with a new boyfriend named Dean.

Clark gets his Smallville class ring, but these rings contain RED KRYPTONITE making him turn into DARK CLARK.

Lana Lang finds some poems from a secret admirer in the gravestone of her parents in the cemetery. Later, she meets the author, Byron Moore, a weird teenager kept locked by his parents in the basement of their farmhouse. They believe the boy is abused by his parents, but soon they realize that he was the subject of an experiment of a laboratory of Luthor Corp, which made him powerfully evil and super-strong when he comes into contact with sunlight. Meanwhile, Martha Kent is invited to work as the assistant of Lionel Luthor, and she accepts the invitation under the reluctance of Jonathan Kent.

At Smallville High School, a swimmer mysteriously ages and dies after meeting his girlfriend Chrissy Parker. The new principal Reynolds arrives and comes into conflict with Clark Kent because he is a friend of Lex Luthor's. Clark asks Chloe and Pete to investigate Principal Reynolds' history, as well as Chrissy whom they suspect is a life-draining freak who needs three youths to stay eternally young every 12 years. Meanwhile, the Kents are having financial problems and Martha contacts her estranged father, whom she hasn't seen for twenty years, to borrow some money, much to Jonathan's disapproval. Lana Lang also finds an old picture of her mother with an apparent boyfriend. After not getting any help from Aunt Nelle, Lana then asks Lex to help her investigate.

A woman appears in Smallville claiming that Clark is her biological son by Lionel Luthor, and she kidnaps Lex to force a confession from Lionel. Clark demands that his parents explain what role Lionel Luthor played in his adoption.

Clark rescues mind-reading Ryan James from a research hospital that treats him like a lab rat. Ryan's guardian doctor sues to get Ryan back, and Clark learns that Ryan has a brain tumor that needs treatment.

Ian Randall is a mentally unbalanced, overachieving student desperate to succeed who gets a 'C' from his stern shop teacher John Frankle. Ian freaks out, duplicates himself and kills Mr. Frankle. The meteor-rock mutant simultaneously invites Lana and Chloe on a literal 'double date', aiming to get a scholarship from Luthor Corp to Yale by using the girls who know Lex Luther. Meanwhile, Lana moves to Chloe's house to live with her and divorced father after Nell leaves town. Clark tries to advise Lana and Chloe about the personality and ability of Ian, but he is misunderstood. Elsewhere, Jonathan breaks his leg, and Lex Luthor meets Dr. Helen Bryce, who is treating Jonathan where an immediate attraction develops between Lex and Dr. Bryce.

While practicing motocross with Pete, Clark Kent falls down through a hole in an underground cave and meets a young Native American woman named Kyla Willowbrook (Tamara Fieldman). Kyla is investigating some mysterious ancient paintings in the walls of the cave, and she and Clark immediately fall in love with each other. Her grandfather Professor Willowbrook and some ecologists are fighting against the construction of a Luther Corp building that will destroy the caves, but generate 1,000 new jobs in Smallville. Martha becomes split between the both interests, but the blind Lionel is motivated only by greed and self-interest to keep the project open, while Lana rallies the rest of the town in a protest to stop the construction project. Meanwhile, a mysterious wolf-creature kills a construction foreman, and threatens Martha and the blind Lionel. Following investigation by Chloe, Clark believes that the Professor Willowbrook is a mutant with the power of transforming himself in a wolf. But the real culprit is Kyla.

Just as Clark and Lana are making progress and he finally sums up enough courage to ask Lana out on a date to a local festival, an old flame rekindles when Lana's former beau, Whitney Fordman, returns from the Marines to make up for lost time. But something is wrong with Whitney for he isn't himself, and Clark sets off to find out what's wrong and why Whitney doesn't remember some things. But the big twist is that the real Whitney was killed in action in Indonesia, and that the meteor-rock shape shifter Tina Greer (from the 'X-Ray' episode) is impersonating Whitney to get romantically close to Lana. Soon, Clark finds himself in a bind then Tina traps and immobilizes Clark in his storm cellar tied up with Lana's kryptonite necklace, until help comes from of all things... the spaceship. Meanwhile, Lex confronts Helen Bryce about her employment with Lionel and questions her motives for being in Smallville.

When Lex Luthor loses a $150 million contract to Luthor Corp, he finds that his mansion was bugged by his father. He hires a team to bug the offices of Luthor Corp expecting to find the building empty since it is Sunday, but Lionel Luthor assigns Martha for work in his office with him. Jonathan becomes very upset, since it is their wedding anniversary, and he was planning a picnic with Martha. Lex calls off the action, but the leader of the group of industrial spies is killed by a member who wants to steal the contents of Lionel's safe. Martha and Lionel become hostages of the criminals, and when they open the safe, a great secret is disclosed. Meanwhile, Lana schedules a meeting with Mr. & Mrs. Small in The Talon to get to know Jennifer Small, who warns Lana about her husband.

Lionel Luthor is shot twice in the Luthor's mansion by an unknown assailant. When Jonathan Kent is found drunk, with a pistol in one hand and a bottle of tequila in the other hand sleeping in his truck, he becomes the prime suspect of the attempt. All the evidences point to him, but Clark believes in his innocence and tries to prove that his father did not shoot Lionel. Clark and Pete team up to investigate leads Lionel had, and learns that the conspiracy to frame Jonathan goes back to the town sheriff. Meanwhile, Lex deals with his father's associate, Dominic Senatori, who thinks Lex was the culprit who shot Lionel, but Lex thinks Dominic is the guilty one. Meanwhile, Lana asks Chloe to investigate Henry Small after he refuses to take Jonathan's case.

During a rave party in the underground cave discovered by the Indian descendant Kyla Willowbrook, the student Travis has a reckless attitude climbing a lamp tower and dies. Soon after, Pete is pierced by a parasite hiding the cave wall, thus becoming reckless and bold. Meanwhile, Lex Luthor hires the linguistic specialist Dr. Fredrick Walden to decipher the meaning of the paintings in the cave. Clark invites Lana to date on the next evening. Later, Clark goes with Chloe Sullivan to the cave, and she is also pierced, changing immediately her behavior. When Pete puts a piece of red kryptonite in the pocket of Clark, he once against becomes 'Dark Clark' or 'Red Clark' in which the trio makes lots of trouble in Smallville and hurts the feelings of Lana.

Lex Luthor rescues his gambler, estranged, half-brother Lucas from a dangerous situation involving Chinese triad gangsters, and brings him to Smallville to help him in a commercial dispute against their father, Lionel. However, Lucas stays side by side with Lionel in his plans of getting his hands on all of Lex's money to feed his gambling habit. The homeless Lex is lodged by Jonathan and his family, while Clark Kent tries to fix the situation with the crafty Lucas before he can carry out his plan to rip off the Luther fortune. But who is playing who? Meanwhile, Clark asks Chloe to put a good word for him to get a job at The Talon which is then bought by Lucas, and Lional reveals that he has regained his eyesight but does not inform anyone.

While hiding the spaceship key in the farm's storm cellar, Martha Kent breathes some unknown meteor-rock spores and immediately gets ill. She is sent to Smallville Medical Center under the care of Dr. Helen Bryce, and the results of her blood tests are sent to the Disease Control Agency (DCA). Because DCA agents are coming to inspect the farm and put it under quarantine, Clark and Pete hurry to move the spaceship. Clark inhales some of the spores and also gets sick, weakening him. The DCA agents find the key, so Jonathan Kent must retrieve it from a military base, expecting a miracle to save the lives of Martha and Clark. With Clark having lost his powers, Helen takes a sample of his blood for examination, and begins to suspect Clark's secret. Meanwhile, Lex fears losing Helen when she gets an offer to leave Smallville to study medicine at a prestigious hospital on the East Coast. Lex also finds out about Clark's condition and secretly takes Helen's medical file on him.

Clark has some weird dreams with the cave and about flying. When he puts the octagonal key in a hole in the wall of the cave, he immediately learns how to decode the symbols. Then, while waiting for Chloe at the Kents' farm, his uncontrolled vision burns a symbol on the wall of the barn. Chloe publishes the picture in the front page of The Torch, and Clark soon receives an e-mail from a wealthy and prominent scientist from New York. Clark goes to New York and meets the reclusive and quadriplegic Dr. Virgil Swann, who tells Clark about his origins from the planet Krypton, his real birth name of Kal-El. Clark also finds another message in the spaceship which troubles Clark. Elsewhere, Dr. Waldon finds the octagonal key left behind in the cave and when he puts it in the cave hole, he gets hit with the so-called Kryptonian knowledge which overloads his brain and ends up in coma, which further fuels Lex's suspicions about the cave and Clark. Also, Lana considers moving out of Chloe's house to look for a place of her own.

When the weird and lonely teenager with healing power Cyrus Krupp claims to be an alien, Clark approaches to him trying to know his origins to determine if Cyrus is a Kryptonian alien, or if he's just a crazy meteor-rock mutant who thinks he's an alien. Meanwhile, Dr. Helen Bryce moves to Lex's mansion, but she realizes that her skeleton key opens all but one room. Lex eventually shows her the inside of the room to reveal his study work about the meteor shower, and about Clark Kent. Also, Lana asks Clark to help her look after her sick prized horse which Cyrus heals the animal. He also continues to claim that his biological parents are coming to take him away.

When Lana is assaulted by three drunken customers at The Talon, Clark defends her and ends up throwing the main antagonist onto the new Sheriff's car. The new uptight Smallville sheriff, Nancy Adams, arrests Clark for assault and battery but later dismisses the charges and gives Clark 40 hours of community service instead. Andrew Connors, the man that Clark threw onto the Sheriff's car, fakes a serious injury and attempts to sue the Kents. With the abrasive Sheriff Adams unwilling to help Clark and his family, Lana decides to help Clark expose Connors as a phony. Meanwhile, Helen is stalked by her ex-boyfriend, Paul Hayden. When Paul attacks and nearly kills Helen, a vengeful Lex teams up with Clark to track down Paul to the train station before he can skip town.

When a van of Luthor Corp is hijacked by three criminals, Clark accidentally witnesses the robbery. He recognizes the leader of the gang, Eric Marsh, a baseball player of Smallville high school. Unwilling to report his suspicious to the pompous Sheriff Adams, who continues intimidating and harassing the Kents, Clark launches his own investigation and discovers that Marsh and his two friends are using refined kryptonite to use as inhalers to give them super-human strength. Meanwhile, Clark quits his job at school paper, The Torch, after discussing with Chloe about him missing a few too many deadlines. Lana sees Jennifer Small with her lawyer, and she tells Lana that she plans to divorce Henry Small. Also, Lex tries to find what cargo was stolen from his father by trying to follow Eric Marsh, while Lionel arrives in Smallville for a surprise visit to Lex, and to Chloe whom he offers her a job as an intern at the Daily Planet newspaper in Metropolis.

Lana sees the impossible: a friend named Emily Eve Dinsmore, who died six years earlier in a fatal accident at age 10, and still appears that age. Clark Kent believes Lana and searches for the truth. Emily's father Mr. Dinsmore has an accident provoked by Emily and Lionel Luthor visits him in the hospital. Lana and Clark eventually discover that Emily is the result of a Luthor Corp experiment in accelerated cloning. But problems in her chromosomes have caused her to be a flawed copy, resulting in a bad temper, with the power of super-speed and telekinesis. Meanwhile, Lex Luthor plans his wedding with Helen, while Lionel gives Lex a free airline ticket for a honeymoon in the Caribean, and to tie up some loose ends over the Emily cloning matter, and to take control of the old cave away from Lex.

As Clark and Lana get more romantically close to each other, the comatose Dr. Fredrick Walden recovers and repeats the sentence "the day is coming, and he will rule the world" many times. He believes that Clark Kent is a menace to mankind. He escapes from the mental institution using a strong power he has achieved and tries to eliminate Clark. Meanwhile, Dr. Helen Bryce returns to Smallville for her engagement party with Lex Luthor, and finds her office broke in and the blood sample of Clark Kent stolen. But who took the blood sample and her office files? Lionel or Lex? Clark is asked by Lex to be the best best man, and Martha and Jonathan Kent to replace his missing parents, as Clark begins hearing voices coming from his spaceship. Also, the evil Lionel Luthor continues playing mind games by trying to poison the relationship of Helen and Lex, as well as Chloe and Clark by offering her an intern job in Metropolis in exchange for her to investigate Clark. But unfortunately, Lionel overhears the revelations of Dr. Walden to Lex about Clark being an alien.

As Clark has finally begun dating Lana, Helen Bryce cancels her wedding to Lex after being told to by Lionel. But later, Helen realizes that she loves Lex and they finally get married. Meanwhile, Jonathan and Martha are thrilled to learn Martha is pregnant. The memory/spirit of Jor-El speaks to Clark via the spaceship, telling him he must leave Smallville, his parents and friends to fulfill his destiny. Clark decides to destroy the spacecraft, and the spirit of Jor-El with it, by using Lionel's kryptonite-made hexagon key that he made a copy of off the late Dr. Walden, in order to use it on the cave wall to learn the kryptonian markings. Clark, with Pete's help, steals the key and uses it to activate the spaceship, knowing the kryptonian radiation will destroy the ship. The ship does explode, but the shock wave injures Jonathan and Martha, causing her to miscarry. Chloe, jealous of Clark and Lana's blossoming romance, accepts Lionel's proposal to investigate Clark and gets the job at the Daily Planet. Clark, grief-stricken at the injury he caused his mother, puts on the red kryptonite ring and heads out of town on a motorcycle, planning never to return. Elsewhere, Lex, flying off on his honeymoon, wakes up alone on the airplane that is about to crash in the ocean...

Metropolis, three months later. Clark Kent (under the influence of the red kryptonite ring) has becomes a criminal, heisting banks, going to night-clubs, and living under the alias 'Kal'. But he comes into conflict with not only his Kryptonian-marked chest, but a ruthless and greedy gangster, named Morgan Edge, who wants an ever increasing percentage of the stolen loot, and also begins to suspect Clark's alien origins. Meanwhile, Lex Luthor is declared dead, but he is living with the weird Louis Leery Jr. in an isolated desert island. Back in Smallville, Dr. Helen Bryce comes to his funeral and meets Lionel Luthor in the mansion where secrets are disclosed. Lana Lang and Jonathan Kent try to bring Clark back to Smalville. Unsucessful after Lana's pleas to Clark, Jonathan makes contact in the cave with the spirit of Jor-El who imbues Jonathan with Kryptonian super-powers to combat Clark and bring him home... in exchange for a price. Also, Chloe enjoys her new job at the Daily Planet, while tailing Lana during her search for Clark.

Lex returns to Smalville and the Lex mansion, and invites Dr. Helen Bryce for a second honeymoon while trying to find out if it was her or his father who attempted to kill him. Meanwhile, Clark also returns to Smallville and the Kent farm, but Morgan Edge finds him and threatens to kill Jonathan and Martha in to get what Clark stole from Lionel Luthor's safe, which is the stolen vial of Clark Kent's blood. With the financial status of the Kent family in dire straights, the farm is sold in an auction, but there is a surprise in the end. Also, Lana tries to declare her love for Clark, but he rejects her love out of fear that she may discover his secret. Clark also returns to Smallville High and to the Torch newspaper under Chloe who continues to investigate Clark's origins.

When Lana is attacked by her obsessed school pal Jake Pollan in the deserted swimming pool of Smallville High School, he is mortally shot by an unknown shooter. Meanwhile, Lex Luthor joins Luthor Corp. and his father, Lionel, requires a $50 million life insurance from him which increases Lex's suspicions. Clark investigates the murder of Jake, and finds that the criminal is Jake's friend Van McNulty, who is killing people affected by the meteor rock radiation, and Lex is the next in his death list. When Clark saves Lex, Van sees that he is special and includes Clark in his bill, and learning of his vulnerability, the growingly paranoid and racist Van concocts and shoots Clark with a kryptonite bullet, and then decides to go after Lana for her association with Clark. Also, Chloe discovers that Lionel has taken all her research documents of Clark after discovering that she has begun investigating Lex.

Clark Kent has a strangely realistic nightmare with him being romantically involved with Lana, Lex discovering his secret, and a girl called Sara Conroy being chased by a weird, red-robed creature called The Traveller. When Clarks wakes up, he learns that was was asleep - for the last 36 consecutive hours. Clark finds that Sara has just moved with her uncle and tutor Nicholas Conroy to the house on the next door that belonged to Lana. Intrigued with the situation, he visits Sara with Lana, and Clark sees that the teenage girl has been in coma for the past six years, increasing the mystery. Clark decides the the solution is literally in his dreams. In Metropolis, Lionel demands that Lex take a psychological evaluation prior to increasing his work responsibilities, but for some unknown reason, Lex refuses.

Clark's future boss at the Daily Planet shows up; Perry White, but this time around he's a dirt bag reporter working for the tabloids.

Clark has downloaded the memories of Jor-El to solve a case that is related to Lana Lang's relative.

After being hit in the forehead by a snow globe containing flakes of meteor rocks in a struggle at a local carnival, the teenager Seth Nelson is given an M.R.I. giving him magnetic abilities. He uses his powers to date and manipulate Lana who is starting to distance herself from Clark by trying to make him jealous. Meanwhile, a snoopy investigator hired by Lex intrusively breaks in The Torch and finds that Chloe Sullivan is examining deeply the life of Lionel Luthor. Lex offers his protection to Chloe to help him investigate his father's past if he had anything to do with a apartment tenement fire that killed Lionel's parents.

While Lex continues to investigate the dark past of his father, he meets Morgan Edge with a new face after plastic surgery, and collects evidence to send Lionel Luthor to prison for the murder of his parents. However, a hit man tries to kill Lex in the mansion, but he escapes to Kent Farm. Clark goes to the mansion to retrieve the evidence against Lionel from the safe and finds that there is no hint of the claimed attempt against Lex's life. When Lionel goes to the Kent Farm and tells that Lex is paranoid and delusional over the death of Lex's infant brother years ago, Jonathan and Martha question his sanity. Clark decides to investigate deeper to see if his friend is delusional or there is an evil plot against him. As it turns out, the answer is literally... both. Although Morgan Edge is indeed alive and after both Lex and Clark, Lex's paranoia is real, which leads to him injuring Lana after he suspects her to be a part of the conspiracy against him. Clark then tries to stop Lex from killing Morgan, and in so doing is forced to reveal his secret to Lex.

Lex is committed to the Belle Reve Sanitarium for the criminally insane by Lionel who forces the shrink, Dr. Claire Foster, to submit Lex to an experimental electroshock therapy technique to erase his memory and forget his past events. Clark visits Lex and after finding out, decides to try to save his friend, despite protests from Jonathan and Martha that Clark's secret is known by Lex. But three of Clark's adversaries reside in Belle Reve. They are the arrogant, power-stealing Eric Summers (from episode "Leech"), the angry, meteor-rock mutant racist Van McNulty (from episode "Extinction") and the double-clone Ian Randall (from episode "Dichotic") who join forces to attack him so Eric can steal Clark's powers again and and escape from the asylum. Meanwhile, Lana begins to distance herself from Clark while she's attending physical therapy to recover from her broken leg with the support of a charming patient named Adam Knight (Ian Somerhalder).

While looking for a birthday gift for Martha at a local jewelry store, Clark intervenes when two thieves try to rob the place using the powerful scream of Nathan Dean (Micah Alberti), a meteor-rock mutant with the ability to project ear-splitting screams. The combination of the scream with a bijouterie of kryptonite deflecting Clark's heat vision back to his face makes Clark blind. Without this sense, his hearing uncontrollably increases. One of the criminals, Masterson (William MacDonald) is arrested. Nathan kidnaps Pete to force his mother, Judge Abigail Ross (Felecia M. Bell), to release Masterson. Meanwhile, the blind Clark listens to a phone conversation between Chloe and Lionel Luthor about Lex and himself. After Clark informs Lex about his father's intentions for them, Chloe is mistakenly taken as Lex's informer and she gets fired from her intern job at the Daily Planet by Lionel.

After leaving an article full of denunciations about the "Summerholt Neurological Institute" with her former colleague of the Daily Planet, Max Taylor, Chloe is chased by Clark Kent who tries to run her down with his truck. He claims that he had received an e-mail just before his action. Later, Lana also receives an e-mail from the same address and tries to kill Chloe on the steps of Smallville High, who is saved by Adam Knight. Clark and Chloe, with a little help from Lex, investigate the mysterious e-mail origin, and they discover that Molly Griggs, a former patient of the unethical Dr. Garner, is using her meteor-rock abilities to force people to kill through a hypnotic suggestion in her e-mails. Meanwhile, Adam moves to Smallville to be close to Lana despite that nobody knows anything about him. Also, Lex makes contact with Dr. Garner and threatens to expose his unethical practices unless he helps him regain his memory of the last seven weeks.

Jordan Cross is a new transfer student to Smallville High School who has a frightening ability: when he is touched by another person, he immediately sees how he or she will die. When Clark saves the suicidal Coach Altman from death, the future of other people changes, including Lana's. Jordan also learns Clark's secret after he physically bumps into him. Meanwhile, Chloe finds that Adam is injecting himself with some kind of experimental medication, while his increasingly erratic behavior troubles Lana. When Jordan touches Adam, he tells Lana that Adam had already died. Also, Lex continues to investigate his past to regain his memory.

While returning home after leaving Jonathan Kent in the hospital recovering from a heart attack, the truck of Martha and Clark is almost hit by two cars racing in the road. For the greatest surprise and deception of Clark, one of the drivers is Pete Ross, who has become the friend of the bad element Jason Dante whom is using meteor-rock synthetic fuel to win at drag races. Pete does not accept Clark's advice and gets into serious trouble when Dante wants $20,000 of losses after thinking Pete betrayed him to the police. Meanwhile, Lex investigates the prominent Dr. Lia Teng about her research of blood platelet with Adam Knight, and Lana feels threatened by the mysterious dark secret of Adam after finding out that he "died" of a rare liver disease and learns about the mysterious blood platelet drug he is taking to keep himself alive.

While in an elevator at Luthor Corp with another girl during a class field trip, Clark is forced to use a few of his abilities when the cable of the elevator accidentally breaks and in the process, the student, Alicia Baker, witnesses Clark's ability of heat vision and punching through steel and in return, Alicia 'teleports' herself and Clark out of the elevator. Clark confides his secret to Alicia who confides her secret of being a meteor-rock mutant with the ability of teleportation. Soon, Clark and Alicia start to get closer and he starts to really think that Alicia could be the one for him. But Alicia on the other hand, turns out to be an obsessed sociopath who wants Clark... NO MATTER WHAT! When Clark starts to realize Alicia's obsession with him, he decides to put an end to their brief relationship. But Alicia won't settle for second and sets off to kill Clark's true love Lana. Elsewhere, Lana finds a journal that Adam has and finds out that he has been spying on her and Clark... under orders from Lionel. So, Lana turns to Lex for help with this situation.

When Jonathan goes to Smallville Medical Centre for a physical examination, his doctor diagnoses arterial blockage and recommends a triple bypass heart surgery procedure. Meanwhile, Vince Davis, the older brother of Clark Kent's friend Garrett Davis, needs a liver transplant - but does not receive one and he dies. His body is sent to Metropolis to be the next test subject of Lionel's experiment by Dr. Lia Teng, who injects his dead body with experimental blood platelets and revives him. When Vince gets sick again (because he needs the life-sustaining blood injections on a daily basis), the unstable Garrett loses control and becomes a threat to the patients, employees, and visitors of the hospital by showing up at the hospital with a kryptonite-infused bomb strapped to himself, threatening to blow himself up unless his brother receives a new liver transplant. Clark must try to find a way to defuse the situation during Jonathan's heart surgery, while the overzealous Sheriff Adams wants to kill Garrett in any way possible... even at the expense of the hostages. Meanwhile, Chloe does some investigating for Lex of Dr. Teng and learns about the mysterious blood platelet serum she's manufacturing and about the first test subject: Adam.

While working as a volunteer with Pete at Smallville Youth Center, Clark receives a distress phone call from Lana, who is shot by Adam. His further investigation shows that the call was made from the future because of a time/space porthole created by a massive electrical surge from a downed power line fitted with meteor rocks, during a coming thunderstorm. Clark must try to save Lana and change the future. Meanwhile, Lionel Luthor shuts down the obscure Merton Laboratory and the research that Dr. Lia Teng is developing with blood platelet, which were finally revealed to have been developed from the vial of Clark Kent's blood. Adam becomes aware that he has less than 12 hours to be injected with the serum, otherwise he will die. He escapes, kills Dr. Teng and her whole team, and Lex is framed as responsible for the mass murder. Adam then sets out to find Lana to know if she still has an extra vial of serum for him. Lex later meets with an FBI agent, named Frank Loder, who enlists his help to bring down Lionel Luther, who also confides in an associate of his about his research and reveals the reason for it: Lionel himself is dying from a rare liver disease.

While on the roof of the barn, Jonathan is contacted though the octagonal key and Clark saves him from a fall. Clark goes to the Kawatche caves with the key trying to find an explanation for what happened, when Lionel Luthor unexpectedly appears and expresses his suspicion towards Clark. Lionel goes to New York and secretly meets with Dr. Virgil Swann and proposes an association to investigate Clark. Meanwhile, the FBI is revealed to have bugs in Lex's mansion for a surveillance to obtain evidence against Lionel, and Clark becomes a suspect due to the interest of Lionel in the apparently simple "farm boy". Later, agents, led by Frank Loder, arrive at the Kent farm to search it for the missing octagonal key, leading Clark to mistakenly believe that Dr. Swann betrayed him to Lionel. Meanwhile, Lana cannot seem to make up her mind whether she wants to stay with Clark or not.

Chloe visits a former friend of her father in Luthor Corp. to know if he is blacklisted, since all his applications are not accepted and he is not able to find a job. She steals his security card and breaks in the Luthor Corp. laboratory trying to find evidence. But she gets accidentally exposed to a meteor-rock gas which gives her the ability to makes people tell the truth whenever she gets in close contact with them, thus exposing their innermost secrets. Chloe uses her new ability to explore her curiosity of journalist, hurting people, including her history teacher, Martha, Lana, and Pete, thus showing the dangerousness of the absolute truth when she attempts to question Lionel about his criminal past, and she gets more suspicious about Clark when she learns that he is the only one immune to her 'truth' powers. But when Chloe falls ill from the side affects, Clark risks his secret becoming known by trying to save her by trying to find the scientist responsible for the kryptonite gas concoction. Meanwhile, Lex continues to uncover evidence against his father to find the grounds for the FBI to arrest him on.

Lex believes that he needs his memories back,but Clark can't take the risk of his secret being exposed.

Lionel calls Professor Joseph Willowbrook to the Kiwatche caves to show a recently found ancient object. Professor Willoebrook brings his assistant Jeremiah Holdsclaw, who takes the relic from the hands of Lionel. It transforms in a knife and makes Jeremiah as powerful as Clark. He runs away from Lionel's security men with the mythic knife. Professor Willowbrook insists that Clark is Namam, the man who fell from the stars, and in accordance with the Indian prophecy, that knife belongs to him and could be destroyed only by his greatest enemy. Jeremiah thinks that the enemy is Lionel and makes plans to kill him. Meanwhile, Lana decides to move to Paris to be away from Clark and make a fresh start. Also, a troubled Pete reveals to Chloe that his parents have decided to get a divorce.

Clark Kent decides to disclose his secret to Lana to avoid her from traveling to Paris, and he invites her for dinner at the Kent farm. But things take a turn when the dangerous teenager Emily Eve Dinsmore, the six-year-old girl (from the episode 'Accelerate') had matured into a grown-up and still obsessed with Lana, escapes from the institute where she is interned. She kills the new owner of Talon and kidnaps Lana. Meanwhile, Chloe joins forces Lex trying to find evidence to send the powerful Lionel to prison for the murder of Lex's grandparents. Elsewhere, Pete is threatened by the corrupt FBI agent, Frank Loder, who is still trying to find what he knows about Clark. Clark then decides against telling Lana his secret after Pete reveals to Clark about the pain of the ability to keep his secret and Pete decides to move away from Smallville to live with his now-divorced mother in Wichita.

At the Kent farm, Clark Kent is surprised in the middle of the night by a naked young woman claiming that she is Kara from Krypton, and asking him to go with her somewhere through the Kawatche caves to be "re-born" with the spirit of Jor-El. Kara also forces Jonathan to reveal the secret deal he made with Jor-El at the beginning of the season. Meanwhile, Clark decides to testify against Lionel to keep him in prison. Lionel sends a key of the secret chamber in the Luthor Mansion to Clark where he finally discovers the reason for the last three years of Lex's personal investigation of him, and he ends his friendship with Lex. Agent Loder continues investigating Clark's origins, until Kara finds him eavesdropping on the Kents and she eliminates Loder for good. Also, Lana leaves for Paris and Chloe and her father are included in the witness protection program. Events come full circle as Jonathan unsuccessfully tries to stop Clark from traveling through a dimensional gateway in the cave wall, Martha observes a Kryoptonia symbol that appears in a open field, Lex is alone in the mansion when he had a drink of brandy which is poisoned, Chloe and her father arrive at a FBI safe house... which explodes with them still inside, and Lionel accepts his new look in prison, but satisfied knowing that his revenge against all those involved with his incarceration has been accomplished.

Three months later. Lois Lane, the second cousin of Chloe Sullivan, arrives in Smallville trying to find the missing Clark Kent to help her to find Chloe's murderer. After being struck by a mysterious ray, she loses control of her car, and finds Clark naked with amnesia in a cornfield. She brings him to Smallville Medical Center, where Martha is with Jonathan Kent, who has been in an irreversible coma. Martha brings Clark back to the farm, expecting him to retrieve his memory. However, Clark is completely dehumanized, having been taken over by his alter-ego Kal-El, whose mission is to find three Kryptonian crystals to assemble into one. Meanwhile in Paris, Lana Lang has an American boyfriend, a young man named Jason Teague, and is having a good time with him, until things take a turn when she gets hit with a mysterious spiritual force containing the spirit of a long-dead witch. Elsewhere, Lex is struggling to recover from being poisoned as he travels to bring an ancient object retrieved from an excavation in Egypt which Clark/Kal-El is also after and uses his flying abilities to steal the crystal... in midair. Also, Lois visits the imprisoned Lionel to talk with him about Chloe, while Martha has a meeting with an associate of Virgil Swan's, named Bridget Crosby, who gives her a new type of kryptonite to combat Clark/Kal-El.

The mystery surrounding Chloe's death deepens as Clark and Lois investigate, discovering that Lex Luthor and Lois' abrasive and militarist father, U.S. Army General Sam Lane, are somehow involved. Meanwhile, Lana returns to Smallville after finding out that the symbol that appeared on her back in Paris is also on the cave wall. In prison, Lionel Luthor prepares for his murder trial and sends out a liquid-metal assassin to keep Clark and Lois from investigating Chloe's 'death'.

Without the approval of his father, Clark kicks off senior year by trying out for the Smallville High Football Team, who are now coached by Lana's new boyfriend, Jason Teague. Former acne-ridden nerd Abigail Fine returns from the summer looking beautiful after some Kryptonite powered plastic surgery that spells trouble for Lana and a former tormentor when Abigail discovers that the side affect makes people insane and delusional to anyone she physically kisses. When Lois investigates Abigail's history, her ruthless, plastic surgeon mother, Dr. Fine, decides to silence the curious but klutzy Lois by enforcing the surgery on Lois. Meanwhile, Martha accepts a job managing The Talon while Lois starts working for the school paper the Torch, and gets just a little closer to Clark.

The Smallville High cheerleaders are using a kryptonite mixed love potion to seriously change the behavior of their victims.

Clark meets a young man with a power of speed that exceeds his own, but the boy lacks responsibility for his actions. Also, Lex finds a manuscript that appears to be some sort of Kryptonian map.

Lionel Luthor, using one of the Kryptonian stones, attempts to swap bodies with Lex but inadvertently transfers bodies with Clark, leading to him learning a few secrets, including that of Clark's powers.

A mysterious bookie with powers of manipulation has a strange, even dangerous, effect on Clark and his friends. Meanwhile, Lex causes friction by using his influence on Jason and Lana's relationship.

In 1604, in southern France, Lana Lang's distant ancestor Countess Margaret Isabel Thoreau and two other evil witches are condemned to be burned at the stake by Magistrate Wilkins, but Isabel manages to spit her blood on a symbol on a page of their mighty book of spells. In the present day, Lana buys the book on eBay, and by touching the blood-spotted symbol, resurrects the evil countess who possesses her body. Isabel/Lana uses a spell to let the other two witches posses Chloe and Lois. The powerful trio vows to pursue its quest for the three (actually Kryptonian) magical stones which can bring them unseen power. The trio enters a 'surprise' birthday party for Chloe in the barn of the Kent Farm and Isabel throws a spell to make the spectacle really hot, so Clark is one of many boys dancing and drinking in boxer-shorts when his appointment arrives, a representative from Princeton University, who is impressed in a way which can't amuse Clark's parents. The vicious witches cast spells against Jason, who is thrown out of a window but caught just in time by Clark, and Lex, who is made to play the piano constantly so his fingers start bleeding till Clark shoves the piano away, and even to draw the super-power from Clark.

Lex gets wrapped up in a sex/murder scandal. Clark gets Lionel's help to get Lex out of trouble. Lana meets Jason's mother, whom she has seen before in a dream, which was set in the 1600s.

After an explosion at a LuthorCorp lab, Smallville's citizens "relive" their worst nightmares.

Alicia Baker returns, and with the help of Red Kryptonite, elopes in Las Vegas with Clark. Lana offers a sexual relationship to Jason in an attempt to win him back. Lionel comes back to Lex with a peace offering.

When Lana is attacked in her apartment and Jason in his car by an invisible being, everyone believes that Alicia Baker was responsible, except Clark. However after a series of circumstances, Clark begins to doubt Alicia's innocence to the mysterious attacks. Alicia tells Clark that she'll offer to prove her innocence if Clark reveals his own superpowers, but Clark refuses. So, Alicia secretly shows Chloe the abilities of Clark, expecting people to leave them both alone. But elsewhere, Lois discovers that the real culprit of the attacks is the deranged Tim Westcott who's jealous of Alicia's abilities which leads to him murdering her, and then goes after Clark. Meanwhile, Genevieve Teague arrives back in Smallville and approaches Lex Luthor to get his help to separate her son Jason from Lana.

Clark is wooed by the offer of a Football scholarship from Metropolis University but faces a dilemma over whether he should accept, knowing he has such an advantage on the field because of his superpowers. Meanwhile, Lois is implicated in the death of a member of the Metropolis University Football team which leads Clark to investigate to clear Lois in which they suspect that the team's idol, named Geoff Johns, may hold a clue. Elsewhere, Lex tries to persuade Lana that Jason's mother had ordered him to try to break her and Jason up for mysterious reasons.

As if Lois Lane didn't make enough of a nuisance of herself now living at the Kent farm, she brings in Einstein, a golden retriever, who is the latest victim to be hit by her car, and she meanly calls him 'Clarky', while Clark, kind as ever, hopes to keep him as a pet if the owner isn't found, which his parents hope. Clark soon finds out it's a surviving dog of an experiment to give canines superpowers with daily injections of steroids mixed with meteorite fragments (kryptonite) produced at LuthorCorp, which Lex insists to Clark that the project was abandoned after animal activist protests, thinking they were all put down. Only later Clark finds out, the hard way, the dog and a Rothweiler are abused by evil Josh Greenfield and his kid brother Zack, who run the Smalville animal shelter and abuse dog whistles to control the super-dogs as weapons for robberies. Meanwhile, Jason and his secretive and manipulative mother, Genevieve, are revealed to know more about Lex and his apparently reformed father Lionel, while Lana and Chloe all take a keen interest in the relevance of the Teague and Lang family trees, which have common roots in countess-witch Isobel's French place of origin.

The Kryoptonian metallic disc is returned to Clark following the death of Virgil Swann. Placing the disc in the cave reveals a message from the spirit of Jor-El instructing Clark to find the three Kryptonian knowledge crystals and unite them before others find them and use them to self-interest. The message goes on to tell Clark that allowing a human to assemble the crystals could lead to the destruction of Earth. The first stone, retrieved by Lex in Egypt in the season opener, is in Clark's possession in the cave. The second is apparently in possession of the late Swann's associates. And the third is located somewhere in China. Clark joins forces with Lana where they venture to China to search for the stone where Lex and Jason are also on the hunt for the stone. But they end up captured by the Chinese authorities and tortured for information to the stone's location, and it leads to the spirit of Isobel once again commandeering Lana's body to fight everyone to take the stone for herself.

When Jason arrives at Lana's apartment at The Talon, they see that is was broken into and wrecked. They discover that the magical stone they took from the Chinese temple is gone. Lana implores Jason to leave it, and concentrate on their romantic relationship instead. But the two meet at Lionel's office, who strongly denies any knowledge of the theft and accuses his son Lex, who makes another innocence-claimant. Meanwhile, the Kent farm gets an uninvited guest's guest: Lois Lane's younger sister Lucy, a violinist who left her fancy Swiss boarding school. The Lane girls start hanging out at Clark's place and at The Talon, where Clark catches Lucy stealing from the till; she says to be in debt with Swiss loan shark Marcus Becker "to afford the lifestyle" of the spoiled brats in her class. Lex knows Becker as member of a major crime syndicate he has business problems with, and offers to help. Becker isn't content to take Lex' money, he kidnaps the sisters to extort more, Clark decides it's time to use his superpowers.

An experiment with heated (black) kryptonite at Luthorcorp causes an explosion which badly wounds Dr. Sinclair, the scientist in charge, and creates a molecular copy of Lex which has the evil side of his personality. While the real Lex shows Clark the experiment was to create far stronger crops, the evil one gives Sinclair a fatal injection in hospital after questioning him. Fearing an effect on himself, 'Evil Lex' locks the good Lex up wearing an iron mask and sets out ruining lives in Smallville, such as closing The Talon when Lana refuses to be his girlfriend, and taunting Lionel Luthor badly enough to make him turn away from charity. When Chloe shows Clark proof on hospital video recordings there must by two Lex's, Super-boy is duped into telling the fiend everything, believing him to be the real one, so the Clark family and Chloe become his prime targets, and he knows about green kryptonite and its affect on Clark.

It's almost graduation, and that means it's time for the prom. After a car accident, a meteor-infected student in-the-run for Prom Queen starts body-swapping. Meanwhile, a dead body is found on Lex's mansion grounds.

Kevin Grady commits thefts and uses his superpower to delete the incident from witnesses' minds. When he does so with Clark who stopped him after robbing The Talon, much more memory gets wiped, so Chloe must take super-boy home to the Kent farm and help him remember who he is, including discovering together the amazing extent of his superpowers and his feelings for Lana Lang. Meanwhile Lana tells Jason she's neither sure she still wants to go to college nor to stay his girlfriend, claiming it's not Clark but their complicated past, he walks off angry, warning she doesn't realize how much he has been protecting her. Clark and Chloe trace a motor-park pass Kevin dropped to his home, or rather to his father Lawrence Grady, and gradually discover Kevin is in memory manipulation therapy with him in Summerholt neurological institute, where Lex once was a patient, for a hunting accident killing his brother Dillon but escaped. Clark helps Kevin...

In the middle of the night on the road, a young pregnant woman is going into labor while the father of her child drives, when she suddenly glows and implodes, while the guy stops the car and runs for his life. Lana and Clark are driving a truck along the same road and find a baby in the crater created by the explosion. They take the baby to the hospital, and the Kent family temporarily guards him, who is connected to Clark. Lana and Clark give the name of Evan, and on the next day, he becomes a teenager, precociously aging. The scientists of Lex study the case and conclude that the boy needs a transfusion of the bone marrow of his unknown father, if he can be found, and even then... Clark tries to save Evan. Meanwhile, Genevieve Teague has a meeting with Lionel Luthor and threatens to hurt Lex, in case the missing stone from China is not delivered to her. But Lionel soon turns the tables on Genevieve by poisoning her (the same way he unsuccessfully tried to poison Lex in the previous season) and threatens not to give her the antidote unless she gives him the second missing stone whom she in fact stole from the murdered Bridget Crosby.

On the last day of Smallville High before graduation, the emotionally disturbed and frustrated photographer of the Torch, Brendan Nash, feels rejected by the Universities and decides to abduct some schoolmates to stay with him forever in a replica of the school. He uses his power of 'Medusa Touch' of turning people into stone by mere touch, and brings Lana, Chloe, and other successful schoolmates to the place. While Clark teams up with the nosy Lois to find the other students, he also talks with Jonathan and Martha over his college choices after graduation. Meanwhile, Genevieve and Jason Teague kidnap Lionel and Lex Luthor and hold them hostage in a remote mountain cabin and torture both of them to try to retrieve the second mystical stone that Lionel took from them.

When Lana (possessed by Isobel) kills Genevieve Teague by stabbing her with one of the Kryptonian Knowledge Crystals after she attempts to steal it, it triggers a cosmic event that not only severs Lana's link to the spirit Isobel but also sends meteorites from deep space toward Earth and Smallville. At the graduation ceremony for Smallville High, the military arrives to evacuate the town after news that another meteor shower is imminent. Fearing he has a link to the meteorites, Clark goes to talk to the spirit of Jor-El, who informs him that his only hope is to unite the knowledge crystals in the cave. With time running out, Clark sets about locating the final two crystals as meteorites reign down upon Smallville. Lana gives Clark the third stone they recovered from China, which was in her possession all this time, while the second stone is on Lionel's person, which activates. Lex offers to protect Lana and have her flown to New York City, but she gets caught in the meteor shower while riding in a helicopter. Lois manages to get out of Smallville in time, but Chloe stays behind to follow Clark who retrieves the final one from Lionel which hits them with a burst of energy driving him comatose. Chloe helps Clark retrieve the final stone from the Luthor mansion safe after he is immobilized by kryptonite, and helps him escape from Lex. Clark manages to unite all three stones, which transports him to the wild tundra of the frigid North Pole...

A meteor shower bursts from the heavens, raining destruction on the unsuspecting citizens of Smallville, Kansas.

After Clark lost his powers, he finds that he needs them the most to save his family.

Gabriel Duncan is a deranged teenager who breaks in the control room of a nuclear silo in Smallville, kills the two security guards, and starts the launch sequence to send one missile to destroy Smallville in one hour. He calls his friend Chloe, who is moving to the university, and asks her to leave the town that he wants to destroy because of the population of "meteor freaks." The army does not know which of the sixteen silos might have been broken in by Gabriel. Meanwhile, Clark and Lana sleep together in his room and early in the morning, Lana sneaks out of the house, but Jonathan and Martha see them. When Chloe calls Clark, he plots a simulation of a car accident with Chloe to force Gabriel to disclose his position. When Gabriel meets Chloe, Clark is deadly shot by the insane teenager, dying in the hospital. Suddenly, Lionel Luthor awakes from his catatonic situation in Belle Reve and Clark's body vanishes from the hospital which leads to both meeting at the Kryptonian Fortress of Solitude at the North Pole which leads to a surprising discovery for Clark. Elsewhere, the evil Lex continues to obsessively study the black spaceship at the LutherCorp warehouse and discovers that something else has climbed out of the ship.

Clark meets Arthur "AC" Curry, a young man with extraordinary powers underwater. AC is in Smallville hoping to sabotage a Luthorcorp experiment that is threatening sea life. While in Smallville, AC forms an attraction to Lois.

Lana tells Clark that she is moving to the Metropolis University and she is accepted in the Tri Psi Sorority, a sisterhood with hot vampires led by Buffy Sanders, and Lana is transformed in a vampire. Meanwhile, the chief-editor of The Daily Planet, Pauline Kahn, denies an intern position to Chloe, but in the end she proposes Chloe to write a good story to prove that she might be part of the team of reporters. Meanwhile, Lex intimidates Professor Milton Fine, but in retribution he shows a dossier about the secret experiments that Luthorcorp is performing in the campus of the Kansas University. When Clark sees Lana at Chloe's room, he believes she is with a hangover; later, he goes with Lana to a Halloween costume party promoted by the Tri Psi. When Lana attacks Chloe, Clark discloses the truth about Buffy and her sisterhood of vampires and tries to find a means to save Lana and Chloe when she gets bitten by the evil vamp Lana.

While working in the night shift at the Daily Planet, Chloe receives a distressed phone call from a woman claiming that she is in danger. Chloe and Lois schedule a meeting with the woman, but a car runs over her and the cousins witness the murder. Meanwhile, the close friend of Jonathan, Senator Jack Jennings, visits the farm to rest from his campaign for the senate against Lex Luthor. Jonathan is surprised by the visit of Detective Maggie Sawyer, who is investigating the death of the nineteen-year-old stripper that Chloe and Lois witnessed last night. She found a picture of Senator Jennings with the girl and is following the lead. Clark believes Lex is involved with the crime, but Lex helps him in the investigation. Lois decides to go undercover by working at the nightclub as a stripper to investigate the murder. When Lois meets the criminal, she is abducted and her life is in danger.

While visiting Lana in Metropolis, Clark opens a package addressed to Lana apparently sent by Lex Luthor and is wounded and infected by a splinter of silver kryptonite. This unusual piece of kryptonite causes Clark to have paranoid delusions, and he sees Chloe, Jonathan, Martha, Lana and Lex plotting against him. He defends himself against his "enemies", jeopardizing the lives of his dearest friends and family. But eventually help comes from a most unlikely of source: Milton Fine.

While returning home with Lois, Martha is hit by a flash of light followed by a thunder and contracts a lethal Kryptonian disease. Clark fears that Jor-El thus makes him pay for his resuscitation and asks for help from Professor Milton Fine, who tells Clark that Jor-El was a dictator on Krypton, who destroyed their great leader General Zod and the planet but sent Clark to Earth to dominate the world; the death of Martha would only be prevented by destroying the Fortress of Solitude. Meanwhile, Lionel convinces Chloe to investigate who Milton Fine really is. When Lois, feeling offended because Lex called her a "muffin peddler", meets Chloe, the double visits LuthorCorp., where the truth is revealed: Professor Milton Fine is actually a Kryptonian artificial intelligence unit, created by Jor-El but re-programed and corrupted by the Kryptonian rebel General Zod, who was executed for treason, and had his spirit banished to the hell-dimension of the Phantom Zone. Fine, a Brain-Interactive-Construct (aka: Brainiac), is trying to trick Clark into releasing Zod's spirit from the Phantom Zone by destroying the Fortress of Solitude.

On Christmas Eve, Lex travels to a dangerous neighborhood in Granville, Kansas, dealing dirty means to cut Jonathan Kent of the race to the senate. He is shot twice in cold-blood when a couple of junkies steal his car, and Lex has a near-death vision of having a possible middle class lifestyle with a pregnant Lana as his wife and their son Alexander. In his near death experience, Lex is a simple man beloved by the people of Smallville and best friend of Jonathan and Clark. Meanwhile in the real world, he is submitted to a life-threatening surgery ordered by Lionel to avoid becoming crippled. Also, Chloe asks Clark to deliver many Christmas gifts to poor children, and Clark meets a sad and disappointed Santa Claus contemplating suicide. In the end, Lex concludes that love is cursed, based on the fate of Julian, Lillian and Lana, and power and money are the most important values in his life... which leads to him finally starting down the path of the dark side beginning when he secretly orders the execution of the junkie couple who attempted to kill him.

While running for campaign to the senate, Jonathan hires Lois as his advisor. Meanwhile, his opponent Lex is visited by a group of fans lead by the fanatic Samantha Drake, and the deranged woman threatens the safety of Jonathan by attempting to assassinate him at a political rally by using Lois to carry out the deed. Meanwhile, Lana discusses with Clark their sex life on why he no longer wants to make love to her, and Clark exposes his innermost fears to Chloe that Lana will discover his secret superpowers if he continues his romance with Lana. Elsewhere, Lionel takes and eliminates the dossier Griff has prepared to Lex to discredit Jonathan, and offers his financial support to Martha.

A deranged policeman who survived the attack of the Kryptonians and his policewoman fiancée break into Lex's mansion asking for the location of the spaceship so they can go public with the news of "aliens on Earth". But Lex locks himself in the panic room. Clark accidentally finds the association of Lana with Lex in their research of the spacecraft when Lana is kidnapped by the renegade cops to force Luthor to leave the room. Lex gets shot, but Lana escapes to the panic room with him. Meanwhile, Jonathan presses Lois to find out who is funding his campaign and Martha tells the truth about Lionel.

Clark reveals his secret to Lana, Jonathan and Lex learn the results of the senatorial election, and there is a tragic car accident on the highway that takes the life of someone Clark loves, forcing Clark to appeal to Jor-El for help.

Clark Kent drops out the rest of the semester from Metropolis University to help Martha on the farm. He misses Jonathan and has not superseded the loss of his foster father. Martha offers Jonathan's watch to Clark, but he refuses. Martha goes to Metropolis to donate Jonathan's belongings to a mission, and she is assaulted by two lowlife criminals. However, she is rescued by a masked and powerful vigilante, but one of the punks steals the watch. Clark feels guilty about the watch and visits Chloe, trying to track the muggers. They decide to find the 'Angel of Vengeance,' and when they meet her, she discloses her identity of Chloe's klutzy colleague Andrea Rojas and tells that she became powerful six months ago after a heart transplantation of a donate that was hit by the meteor shower. Her mother and she were attacked by a mugger who killed her mother while Andrea survived, thirsty of revenge against the killer of her mother. Clark joins Andrea, but with a different viewpoint of justice since Andrea believes in killing criminals who have gotten away with murder through legal technicalities, whereas Clark still believes in the court system despite it not working most of the time. Meanwhile, Lionel tries to take the LuthorCorp from Lex, but he is blackmailed and gives up his intention.

During a power blackout, Chloe sees the ghost of a girl and cuts her both wrists. Chloe is interned in the hospital, and the psychiatrist diagnoses that she had a breakdown due to stress. Lana asks Lex to send Chloe to a mental institution for treatment since nobody believes her. However, Clark brings his friend to Lois's apartment above The Talon, where Chloe is possessed by a spirit of the dead girl, called Gretchen, and shows Clark the place where the skeleton is hidden in the Talon's wall. Chloe leaves the apartment alone seeking revenge against the killer, while the deranged orderly Michael Westmore kidnaps Lois. Meanwhile, Clark researches for information about the death of Gretchen in old newspapers. Also, Lionel encourages Martha to take the late Jonathan's place as senator to move on with her life.

After being released from a prison in a laboratory of Luthorcorp's Cyntechnics by sympathetic scientist Dr. Hong, former Metropolis High football player Victor Stone is chased by armed security guards and hit by Lana's truck, without any harm. The car is totally destroyed, Lana wounds her forehead and Victor takes her to a hospital. Lana calls Clark, and he meets Victor, who played football against him in high school and died a year ago in a car crash. Victor explained that he became a living machine as part of the machine project researched by the evil Dr. Allister Krieg sponsored by Luthorcorp. Further, he misses his girlfriend Katherine. Clark promises to help him and visits Lex, who lies and tells Clark that he was not aware of the project. Meanwhile, Martha is blackmailed with a DVD showing Clark on a security camera rescuing the unconscious Lana from the warehouse explosion (from episode 'Lockdown') and Lionel offers to help her find the blackmailer.

Simone, a gorgeous blonde, comes to Smallville hypnotizing Clark with a blue pendant ruining his relationship with Lana, as well as hypnotizing Martha and Lex.

The lonely Lana gets addicted in a meteor rock cocktail developed by her new acquaintance student of medicine, Lance, which allows the user to have a near-death experience and visit the dead loved relatives and friends. Meanwhile, Clark goes to Honduras, where there is a massive destruction, trying to find Milton Fine and the spacecraft after following a lead from Chloe. When Lana gets in trouble, Clark returns to Smallville but is injected with the serum. In his trip, he meets Jonathan, who tells him that Lionel Luthor knows his secret, while Martha gets close to Lionel.

When the foster mother and chief of staff of Martha's, Naomi, is brutally murdered, her adopted daughter, Maddie stays with Martha and Clark. The girl becomes close to Clark and speaks for the first time in years. But when she discloses her power to shatter glass, she becomes the prime suspect for the death of Naomi and her biological mother after Lois voices her suspicions to it. While Clark investigates the origin of Maddie, her powerful father, who also has the same ability, breaks out of prison and abducts her. Meanwhile, Chloe witnesses Lex and Lana too close to each other, and later she accuses Lex of taking advantage of the vulnerable Lana.

Lionel Luthor is chased by a man with a mask and forced to play hangman to save his life when he traps Lionel in his limo in the path of a moving train. Later, he is abducted by the same stranger who places Lionel in an abandoned warehouse where he has to play lethal 'Jigsaw' type games to survive. Martha is also kidnapped and in his last test, the life of Martha is also put at stake and Lionel has to fight to save her life. Meanwhile, Chloe, Clark and Lex join forces trying to find Martha and Lionel.

Standing outside the Metropolis courthouse with Chloe, Clark saves Graham Garrett from a car which would have crushed him. Graham insists to repay the favor by offering Clark whatever he wants, including the opportunity to be with Lana again. Graham later turns out to be a hired killer with chameleon powers that render him invisible. Clark also gets angry at Chloe for keeping Lana and Lex's affair from him. When Clark realizes that Graham wants to kill Lex and Lana to protect his identity, Clark rushes to find and ptotect them both.

Jonathan Kent appears to Clark on his birthday and instructs him that he needs to kill Lionel Luthor because Lionel knows his secret. Meanwhile, Lionel comes clean to Martha about his knowledge of Clark's secret since his possession by Jor-El, and some of his scribblings from his now-telepathic link to Jor-El are revealed to announce that the "Vessel of Zod" is coming. Meanwhile, Lex has another meeting with Milton Fine who tells Lex that he is trying to make a vaccine to protect mankind against an alien virus. When Lana expresses suspicion that Fine is not who he appears to be, Fine reveals his real identity and that "Jonathan Kent" is just another copy of Fine (The Brainiac) sowing seeds of anxiety in Clark.

After "being prepared" by Fine, Lex is abducted in a field by a strange light. Meanwhile, Clark goes to the Fortress of Solidude where the spirit of Jor-el gives a dagger to Clark and advises him to destroy Lex, who would be the vessel of the spirit of Zod outside the Phantom Zone in which Fine, the Brain-Interactive-Construct, is trying to release. Martha travels with Lois to Washington in an airplane of the Luthorcorp. When Zod is released, he possesses Lex, and traps Clark in the Phantom Zone. Fine unleashes a powerful computer virus, creating chaos on Earth. Lois and Martha faint in the airplane without oxygen as another copy of Fine/Brainiac hijacks the plane. Chloe and Lionel are attacked by a raged crowd, while Lex/Zod and Lana declare their love for one another as both plan to travel their path together on the dark side...

With Clark banished to the Phantom Zone, Metropolis is in shambles as the city riots, and Chloe & Lionel plot to rid Lex of General Zod...one way or another.

Still trying to fix the aftermath of Black Thursday, Clark gets a little run down and begins to show symptoms of the common cold, including a sneeze that has some effects of its own. Meanwhile, someone kidnaps Lex.

One of the Phantom Zone escapees is up to no good in the local forest. Clark is jealous of Chloe's new boyfriend from the paper. Meanwhile, Lana and Lex finally sleep together and Lois falls in love with Oliver Queen, Martha's benefactor.

Clark and Lois are on the trail of a thief that Lois has named the Green Arrow Bandit. But this "bandit" may not be as big a villain as they believe.

Classmates from Lex and Oliver's reunion begin to die, and they begin to blame each other.

Clark is thrilled when he learns that his friend, Raya, managed to escape from the Phantom Zone and has come to see him in Smallville. The two grow close and Raya shows Clark how to restore power to the Fortress of Solitude. However, Baern, the spirit of a killer with the ability to control and feed off electricity, also has escaped from the Phantom Zone. After possessing the body of a street kid in Oakland, California, Baern makes his way to Smallville to take revenge on both Raya and Clark for his imprisonment. Meanwhile, Lana gathers more information about Lex's research project called ROCK. Also, Jimmy Olson returns to try to win back Chloe's affections by tailing Lana to find any dirt on Lex Luthor.

Lois Lane is furious at lover Oliver Queen for leaving instead of waiting till she 'makes it worthwhile' but ignores he witnessed a thug attacking a couple and was badly wounded by the carjacker he fought off. Clark reads an article about the Green Arrow striking there and drops by finding Oliver uncharacteristically careless and irritable; his X-ray vision sees Olliver injecting himself. It's a wonder drug developed for Queen Industries by Dr. Pamela Black, which almost instantly restores damaged tissue, but the scientist advices in vain against taking significant doses because lab mouse trials prove a major aggressiveness side-effect. Lex is vehemently against Lana -whose health problems are soon diagnosed a happy surprise- taking charge of fund raising for a half-way house, without telling her his reason for fearing contact with its clients, even on few occasions: he bribed Dr. Black to administer the wonder drug to its problem youths, one of which was the car-jacker. Martha Clark insists to invite Lionel for the first Thanksgiving dinner after Jonathan's death.

Lex is targeted by a former Belle Reve patient who can move through frequency, and who wants him to come clean about 33.1. Meanwhile, Clark goes to Seattle to hunt down one of the Phantom Zone escapees.

An illegal immigrant from the Mc Nally farm seeks Clark's help. He then uncovers a sinister secret in the farmer's cornfield which has been hidden since the last meteor shower.

The Daily Planet's gossip queen Linda Lake uses her ability to transform herself into water to find the dirt on people and run her weekly saucy story, however detrimental for them. After bringing out baseball star Mike Dawson is doped, Lake drags him into a fountain pond staging suicide, which fan Jimmy Olsen convinces Chloe can't be true. Next Linda overhears Chloe and Lana about her doubts to accepts Lex's marriage proposal because she is not quite over Clark and prints it, to Lex's despair and making Clark realize he's not quite over Lana either. Lex promises Linda any price to find something against Clark, and Chloe has a hard time keeping his being Kryptonian secret, while it makes her furious that people tells her their secrets while complaining when refused another's secret. When Lois tells Clark she suspects Olliver of being the Green Arrow after seeing he has an arm wound at the same spot, but wants him to be innocent either way, he finds an original way to help both friends while she gets Jimmy to help her set a trap for Ollie. Lex is prepared to wait for his pregnant lover...

The Green Arrow sends out for reinforcements and Bart Allen, a.k.a. Impulse, Arthur Curry (Aquaman) and Victor Stone (Cyborg) return to Smallville to help him take down LuthorCorp's secret lab called 'Project 33.1'. During a break-in at the LuthorCorp facility, Bart is captured and tortured by Lex for information to who hired him. Clark sets off to rescue him but is felled by kryptonite. An alarmed Chloe goes to Oliver for help, and the newly formed "justice league" springs into action to rescue Clark and Bart. Meanwhile, Oliver painfully decides to break up with Lois, feeling that his dedication to justice is more important, but he leaves out that information from her.

Clark enters a parallel environment in his subconscious where he is powerless, no one believes the truth about him, and things have turned out much, much differently.

Clark once again becomes "under the influence" of red kryptonite, and will say his true feelings on such things as Lionel and Martha's relationship, and Lana's pregnancy, but there may be someone else that will get affected by the red k.

After receiving a photo of herself dressing in her room, Lana realizes she has a stalker. After hiding out in Chloe's apartment above The Talon, Lana decides to hide out at another surprising location: the Kent farm so Lana can try to find out more about Clark as she grows more suspicious of his abilities. Meanwhile, Jimmy helps Clark try to find Lana's stalker in which he eventually breaks up with Chloe because he believes she isn't truly over Clark, forcing Chloe to take a deep look at her feelings for her best friend.

A boy who got blind during the meteor shower has developed the power to spot other meteor infected people, and Chloe is revealed to be one of them. Meanwhile, Lana closes in on Clark's secret.

Clark has second thoughts about Lana marrying Lex, Lana starts to have the same concerns. Meanwhile... the doctor involved in the secret behind Lana's pregnancy threatens Lex with his knowledge.

Clark and Chloe discover that Titan, another alien escapee from the Phantom Zone, is the hulking star of a secret fight club whose bloody, bare-knuckle battles to the death are broadcast on the Internet. Lois smells a story and investigates on her own but is captured by fight manager-presenter Maddox, the Belle Reve administrator, and forced to become wrestler Athena's first opponent. To save Lois, Clark reveals his ability to catch bullets to Maddox so he can fight Titan, but is stunned to face Lois in the ring instead... Lana returns from her honeymoon with Lex, whose men are looking for Titan, but she's more uncertain about living the life of wealthy and power and has trouble with her pregnancy.

After Lex discovers that Chloe's mother, Moira, has the power to control meteor freaks, he develops a drug to wake her from her catatonic state in the asylum, then he threatens to kill Chloe unless she uses her power to help him recover several meteor-freak escapees from his lab '33.1'. Clark helps Chloe break into the asylum to rescue Moira and finally get to know her mother, and he is almost tempted to kill Lex, but lets him live... again. Meanwhile, Clark rescues Lana from one of Lex's 33.1 escapees, and she later discovers something shocking about her "pregnancy." Also, Chloe decides to write an article about Lex's 'Project 33.1', but Lex silences her by threatening to have her locked away unless she remains quiet about his secrets projects.

After Jodi Keenan, the wife of a Special Forces soldier, sets off a pipe bomb in one of Lex's secret labs, Lionel is severely injured and Lex is taken hostage by the enraged spouse. Claiming Lex kidnapped her missing husband, Jodi threatens to blow up the entire lab with Lex inside unless he tells her where her husband is. Lex naturally denies knowing Jodi's husband, Wes, Clark sets off to rescue Lex, but is immediately felled by the kryptonite lining the earthen walls. Lex and Clark realize the only way they will make it out alive is by helping each other before the bomb detonates. Meanwhile, Lionel reveals to Lana why he forced her into marrying Lex, which leads her to investigate Lex's secret research of his 'Project 33.1' research as well as his work in tracking down the Phantom Zone escapees to capture and use one as part to create his army of 'super-human' soldiers.

After a secret meeting with Lionel, Lana is shot at the Daily Planet by a mysterious gunman. Jimmy is knocked out while studying photographs of the scene and dreams about a 1940, black-and-white version, of Smallville. Jimmy finds himself playing the role of a reporter with Chloe his secretary, and a bumbling Clark also works there, as his sidekick. Jimmy's investigation leads him to Lana, who turns out to be a very evil femme fatale who plans to orchestrate the murder of her tycoon husband Lex by using Jimmy as the patsy. Jimmy's research further takes him to a notorious nightclub owned by Lionel Luther, and Lois is a sultry singer working at club who is having a fling with Lex to help him orchestrate the murder of Lana. Meanwhile, back in 2007, Clark discovers why Lana married Lex after Chloe learns it from Lana. Also, Lois further meddles in the shooting case by stealing a silver-lined cigarette case which holds a clue.

Lex has been secretly trying to turn Wes Keenan, a military man who supposedly died fighting in Afghanistan, into a "super soldier" by injecting him with DNA pulled from the various meteor freaks he has captured. After a crooked senator, Ed Burke, who has been financing the 'Project 33.1', threatens to expose Lex's secret labs, he dispatches Wes to kill the senator. But Lois witnesses the attack and inadvertently becomes the super soldier's next target. Meanwhile, Clark tries to convince Lana to leave Lex, but she refuses and Clark becomes more suspicious about Lionel's involvement with Lana's motivation. Following Senator Burke's murder, Martha is asked to be his replacement in Washington D.C. which means leaving Smallville (and Clark) behind.

When Clark finally discovers Lionel threatened to kill him unless Lana married Lex, he goes after Lionel to silence him once and for all. Meanwhile, Lana tells Lex she is leaving him, and John Jones, the Martian Manhunter, makes a return appearance to help Clark stop Lex, who has captured the last surviving phantom escapee from the Phantom Zone, having possessed a young boy, in order to use its DNA to power him army of super soldiers at his secret lab '33.1'. Clark bids goodbye to Martha as she prepares to leave Smallville for Washington D.C., and Clark finally reveals his secret to Lana to get her to stay in town. But when Lana mysteriously 'dies' in a car bombing, Clark thinks Lex was behind it and sets off to kill him, and has a fateful meeting with the last wraith of the Phantom Zone at Lex's 'Project 33.1' lab at Reeves Dam. Lois goes to Reeves Dam in search of information about Lex's secret lab and is brutally stabbed by a security guard. Chloe finds a piratically dead Lois at the dam where in a moment of weakness, Chloe's secret power is finally revealed.

When Clark Kent confronts Bizarro, the last wraith from the Phantom Zone, the ensuing fight causes the dam to break, unleashing a torrent of water.

Clark and Lois discover Kara's spaceship but before they can open it, Kara appears and knocks Lois out. Clark is shocked after Kara tells him she is there to protect baby Kal-El. Despite Kara's appearance, a despondent Clark decides that without Lana there is nothing keeping him in Smallville, and heads to the Fortress of Solitude to begin his training as a superhero. However, Jor-El tells him Kara's father- Zor-El, who is Jor-El's brother- is evil and Kara is dangerous, therefore Clark must stay in Smallville to find out why she came to Earth. Lex makes a stunning discovery regarding Lana and Project 33.1.

Kara desperately wants to make friends and fit in on Earth, but Clark tells her to keep a low profile until she can get her powers under control. Despite his warnings, when Smallville's annual "Miss Sweet Corn" beauty pageant comes around, Kara signs up and meets the competition; Tyler, Carly, and Tempest, three meteor-infected vixens who plan to use their powers to steal a treasure map to the hidden Smallville time capsule. Meanwhile, Lana returns to Smallville and wants to re-start whatever romance she had with Clark. In Metropolis, Agent Carter interrogates Lex in his further search for Kara's missing spaceship, while Chloe and Jimmy clash with the vain and egotistical Grant over the developing story in Smallville.

Lex hires Dr. Curtis Knox who claims that he can "cure" someone from being a "meteor freak," changing their lives. Chloe takes an interest in this, but Dr. Knox may have another secret as Clark finds out that Dr. Knox is an ageless immortal who needs blood from kryptonite-infected people to keep his young wife eternally young. Meanwhile, Kara makes an alliance with Jimmy to find out where her spaceship crystal is being held, while John Jones warns Clark that Kara is dangerous and tells him to find the Kryptonian crystal before Kara does. Elsewhere, Lana secretly watches Lex through her Isis Foundation to help meteor freaks.

The residents of Smallville are thrilled when "Warrior Angel," a movie based on a comic book, begins shooting in town. However, after the lead actress, Rachel Davenport takes off in stunt car with cut brakes, Clark must step in to stop the runaway car. Unfortunately, an obsessed fan witnesses this heroic event and decides Clark is a real life superhero, whose girlfriend Lana must be eliminated so Clark can fulfill his destiny. Meanwhile, Lex discovers Lionel at the cabin.

Clark learns Kara is in Washington searching for the crystal. Kara is captured after she breaks into the lab and sedated with a kryptonite-infused truth serum. The serum causes her to relive a prior trip to Earth when she followed Clark's biological mother, Lara, to the Kent farm. Clark arrives in time to save her but, searing the machine with heat vision, he also falls victim to the serum and sees what Kara sees: his mother.

Kryptonite and high voltage mix during a lightning storm -- causing Lana to absorb Clark's powers. Using her newfound super powers, she breaks into Lex's safe and steals incriminating evidence -- which she then delivers to Lois and Grant, demanding they run a story exposing Lex's secrets. After Grant refuses to use stolen material, Lana decides to take care of Lex...herself. Clark tries to stop Lana from killing Lex...and a super battle ensues between the two!

Clark hears the voice of his biological mother, Lara, calling for help from Kara's crystal and decides to release her, despite Jor-El's warnings. Lara and Clark reunite and she gives him Jor-El's ring, which contains blue kryptonite. As Clark puts it on, he realizes Zor-El manipulated the whole thing and that blue kryptonite strips him of his powers, enabling Zor-El to take control of the Fortress of Solitude. Meanwhile, Chloe and Lex each discover Lois and Grant have been seeing each other and warn them to stop.

As Christmas draws near, Lois receives a call from an anonymous man claiming that Chloe is attached to a bomb, and the only way he won't let it blow is if she reports the truth of Lex's atrocious experiments about the mysterious 33.1. Lois tries to find a way on her own to stop the mysterious person who is linked to both Lex and Grant Gabriel. Chloe and Jimmy end up getting stuck in an elevator at the Daily Planet with the bomb ticking, prompting Chloe to reveal her secret meteor-rock power of healing to him. Meanwhile, Clark returns from his enforced imprisonment from the Fortress of Solitude. With Kara still missing, Clark uncharacteristically wants Lana to re-open her Isis program of spying on Lex with the intent of taking him down, and wants to become closer to Lana when he has been distancing himself from her. But what exactly does 'Clark' have in mind?

While Clark is still frozen in the fortress, Bizarro grows closer to Lana, who returns the feelings on just as deep a level, even sharing some badly-needed information with him while he still attempts to carry out his intentions of destroying Clark. Lex's brother, Julian, reveals himself to Lionel in an effort to clear the air between all parties involved.

Oliver returns and enlists Chloe in his vendetta against Lex, but a sexy new 'superhero' stands between Oliver and his mission, even if Lex is, ultimately, one of the bad guys.

Clark is convinced that he can find his cousin's whereabouts if he can get into Lex's mind, who's just been shot by the man holding Kara and Lois prisoner.

Pete Ross returns to Smallville and finds a number of surprising changes since his departure four years earlier. Besides resolving his feelings toward Clark since he learned of his friend's secret, Pete has to deal with the acquisition of a superpower of his own: that of his ability to 'stretch' his body courtesy of kryptonite-laced gum he's been chewing and consuming for nearly a year. Meanwhile, Lex continues to sow seeds of anxiety into the amnesiac and powerless Kara over Clark as well as wanting to know about her past, as does Jimmy Olsen.

Lionel kidnaps Clark and holds him in a kryptonite-lined cell at a Luthorcorp facility; Chloe and Lana confront Lionel, who blames Lex, and they then take Kara to the Fortress and plead with Jor-El to restore her memory so she can save Clark.

When Brainiac ends up in a confrontation with Clark after trying to coerce Kara into joining him, he takes it out on Lana.

Despite his father's warning, Lex still finds himself in a power struggle from within over the secret to The Traveler...with some deadly results.

All in one night, the Feds try to head off Chloe, who's hacking into top secret computers, convince Jimmy Olsen that she's a terrorist, and ground Lex, preventing him from flying anywhere.

Clark is shown by Jor-El what life on Earth would have been like, had he not sent him there instead of facing the doom of his fellow Kryptonians.

When a member of the Veritas clan attacks in his name and carves Kryptonian symbols in the victim's chest, Clark stands by his principles in hurting no human being, even though the victim is Lex Luthor

Clark feels that Kara is under the effects of red kryptonite when he discovers that she is the reason for the plane containing the last member of the Veritas exploding. Lex is directed to look for answers surrounding the traveler in the Arctic Circle, where Clark's Fortress of Solitude rests.

It's been four weeks since the Fortress collapsed and Clark disappeared. Green Arrow calls upon Black Canary and Aquaman to locate the missing Clark Kent. Clark, in the meantime, is powerless and residing in a Russian prison camp in Siberia. With Lex Luthor missing and presumed dead, a new ruthless CEO, named Tess Mercer, is appointed the head of LuthorCorp and moves into Lex's mansion with her own dark plans for Clark and Metropolis. Chloe is kidnapped by a clandestine group that has discovered her special powers and they want to test the limits of those new powers by locating Green Arrow and his friends.

Oliver gets a step closer to finding Lex, but Clark refuses to help for the time being, due to Chloe's special day, while Lois finds she has special feelings for Clark, who has a surprise (or two) waiting for him at the wedding reception.

The aftermath of Doomsday's attack on Chloe and Jimmy's wedding leaves Clark in shock, but before he can search for the kidnapped Chloe, an evil being, known as The Persuader, appears and attacks him. Rokk, Imra and Garth, also known as The Legion, step in from the future to help vanquish the Persuader and the group realizes Brainiac has taken over Chloe once again. Meanwhile, up at the Fortress, Chloe, as Brainiac, informs Davis he is Doomsday and was created to kill "the other Kryptonian" and destroy the world.

Clark discovers John Jones was shot while working as a police officer, so Clark dons the uniform and goes undercover to find the culprit. Meanwhile, Lana confronts Tess and tells her Lex isn't the man she thinks he is. Lana's shocking news forces Tess to reevaluate her position as the head of Luthorcorp.

Clark and Chloe search for Lana, who has it in her head that things will be better between her and Clark if they were on "a more-even keel," and goes off on her own in search of a suit developed by Luthor, Corp. that will make her invincible.

There is an explosion at Luthorcorp when Oliver is about to announce he controls the interests of Luthorcorp. Oliver suspects Lex is behind the explosion but he realizes the bomb was made by an ex Queen Industries' employee called Winslow Schott. Lana learns her power suit gives her the power to absorb Kryptonite.

Still gravely pondering his place in life, Clark lets Lois drag him along to their Smallvillle high school reunion. Rather than enjoying his hero status, while Lois shines less than she expected, Clark worries when he spots Brainiac, but it turns out he returned from the future with the Legions ring to show Clark how vital his contribution is to prevent a horrible future for him, Oliver, their friends and the world.

The story of Clark Kent culminates in this two-hour series finale as Clark takes the last step to becoming the Man of Steel.

Lana sees the impossible: a friend named Emily Eve Dinsmore, who died six years earlier in a fatal accident at age 10, and still appears that age. Clark Kent believes Lana and searches for the truth. Emily's father Mr. Dinsmore has an accident provoked by Emily and Lionel Luthor visits him in the hospital. Lana and Clark eventually discover that Emily is the result of a Luthor Corp experiment in accelerated cloning. But problems in her chromosomes have caused her to be a flawed copy, resulting in a bad temper, with the power of super-speed and telekinesis. Meanwhile, Lex Luthor plans his wedding with Helen, while Lionel gives Lex a free airline ticket for a honeymoon in the Caribean, and to tie up some loose ends over the Emily cloning matter, and to take control of the old cave away from Lex.

Clark has second thoughts about Lana marrying Lex, Lana starts to have the same concerns. Meanwhile... the doctor involved in the secret behind Lana's pregnancy threatens Lex with his knowledge.

When Lana is assaulted by three drunken customers at The Talon, Clark defends her and ends up throwing the main antagonist onto the new Sheriff's car. The new uptight Smallville sheriff, Nancy Adams, arrests Clark for assault and battery but later dismisses the charges and gives Clark 40 hours of community service instead. Andrew Connors, the man that Clark threw onto the Sheriff's car, fakes a serious injury and attempts to sue the Kents. With the abrasive Sheriff Adams unwilling to help Clark and his family, Lana decides to help Clark expose Connors as a phony. Meanwhile, Helen is stalked by her ex-boyfriend, Paul Hayden. When Paul attacks and nearly kills Helen, a vengeful Lex teams up with Clark to track down Paul to the train station before he can skip town.

In 1604, in southern France, Lana Lang's distant ancestor Countess Margaret Isabel Thoreau and two other evil witches are condemned to be burned at the stake by Magistrate Wilkins, but Isabel manages to spit her blood on a symbol on a page of their mighty book of spells. In the present day, Lana buys the book on eBay, and by touching the blood-spotted symbol, resurrects the evil countess who possesses her body. Isabel/Lana uses a spell to let the other two witches posses Chloe and Lois. The powerful trio vows to pursue its quest for the three (actually Kryptonian) magical stones which can bring them unseen power. The trio enters a 'surprise' birthday party for Chloe in the barn of the Kent Farm and Isabel throws a spell to make the spectacle really hot, so Clark is one of many boys dancing and drinking in boxer-shorts when his appointment arrives, a representative from Princeton University, who is impressed in a way which can't amuse Clark's parents. The vicious witches cast spells against Jason, who is thrown out of a window but caught just in time by Clark, and Lex, who is made to play the piano constantly so his fingers start bleeding till Clark shoves the piano away, and even to draw the super-power from Clark.

After Jodi Keenan, the wife of a Special Forces soldier, sets off a pipe bomb in one of Lex's secret labs, Lionel is severely injured and Lex is taken hostage by the enraged spouse. Claiming Lex kidnapped her missing husband, Jodi threatens to blow up the entire lab with Lex inside unless he tells her where her husband is. Lex naturally denies knowing Jodi's husband, Wes, Clark sets off to rescue Lex, but is immediately felled by the kryptonite lining the earthen walls. Lex and Clark realize the only way they will make it out alive is by helping each other before the bomb detonates. Meanwhile, Lionel reveals to Lana why he forced her into marrying Lex, which leads her to investigate Lex's secret research of his 'Project 33.1' research as well as his work in tracking down the Phantom Zone escapees to capture and use one as part to create his army of 'super-human' soldiers.

While working as a volunteer with Pete at Smallville Youth Center, Clark receives a distress phone call from Lana, who is shot by Adam. His further investigation shows that the call was made from the future because of a time/space porthole created by a massive electrical surge from a downed power line fitted with meteor rocks, during a coming thunderstorm. Clark must try to save Lana and change the future. Meanwhile, Lionel Luthor shuts down the obscure Merton Laboratory and the research that Dr. Lia Teng is developing with blood platelet, which were finally revealed to have been developed from the vial of Clark Kent's blood. Adam becomes aware that he has less than 12 hours to be injected with the serum, otherwise he will die. He escapes, kills Dr. Teng and her whole team, and Lex is framed as responsible for the mass murder. Adam then sets out to find Lana to know if she still has an extra vial of serum for him. Lex later meets with an FBI agent, named Frank Loder, who enlists his help to bring down Lionel Luther, who also confides in an associate of his about his research and reveals the reason for it: Lionel himself is dying from a rare liver disease.

Lana Lang finds some poems from a secret admirer in the gravestone of her parents in the cemetery. Later, she meets the author, Byron Moore, a weird teenager kept locked by his parents in the basement of their farmhouse. They believe the boy is abused by his parents, but soon they realize that he was the subject of an experiment of a laboratory of Luthor Corp, which made him powerfully evil and super-strong when he comes into contact with sunlight. Meanwhile, Martha Kent is invited to work as the assistant of Lionel Luthor, and she accepts the invitation under the reluctance of Jonathan Kent.

Clark and Chloe search for Lana, who has it in her head that things will be better between her and Clark if they were on "a more-even keel," and goes off on her own in search of a suit developed by Luthor, Corp. that will make her invincible.

The Kryoptonian metallic disc is returned to Clark following the death of Virgil Swann. Placing the disc in the cave reveals a message from the spirit of Jor-El instructing Clark to find the three Kryptonian knowledge crystals and unite them before others find them and use them to self-interest. The message goes on to tell Clark that allowing a human to assemble the crystals could lead to the destruction of Earth. The first stone, retrieved by Lex in Egypt in the season opener, is in Clark's possession in the cave. The second is apparently in possession of the late Swann's associates. And the third is located somewhere in China. Clark joins forces with Lana where they venture to China to search for the stone where Lex and Jason are also on the hunt for the stone. But they end up captured by the Chinese authorities and tortured for information to the stone's location, and it leads to the spirit of Isobel once again commandeering Lana's body to fight everyone to take the stone for herself.

There is an explosion at Luthorcorp when Oliver is about to announce he controls the interests of Luthorcorp. Oliver suspects Lex is behind the explosion but he realizes the bomb was made by an ex Queen Industries' employee called Winslow Schott. Lana learns her power suit gives her the power to absorb Kryptonite.