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.

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.

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

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.

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.

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.

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.

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.

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

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.

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.

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.

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.