In Manhattan, Peter Petrelli is the younger brother Nathan Petrelli an overly ambitious and unscrupulous candidate for the next New York congressman, and he dreams and believes that he can fly. He decides to prove his theory and jumps from the roof of a building in an alley and his brother flies and saves him. In Texas, cheerleader Claire Bennet learns that she is literally indestructible and can not harm herself or die. She saves a fireman in a fire in a train, but does not take the credit. In Tokyo, Hiro Nakamura believes he can control time and space continuum. In India, Mohinder Suresh moves to the Brooklyn, New York, where his father, that was researching a secret project called Genesis about genome and DNA, is killed in a taxi cab. In Lower Manhattan, the painter Isaac Mendez paints pictures of the future. In Las Vegas, stripper Niki Sanders borrows $30,000 from a powerful local mobster to get her young son into school, and does not have the money to pay her loan. She sees a different image of her in the mirror, and when two gangsters come to her house to collect the money, one of them hits her and she faints. Later Nikki wakes up, and the two thugs are dead... literally torn apart by her evil alter ego.

When Nikki wakes up, she sees the two criminals dead in her garage. She brings her son and finds a brand new Cadillac in her name and the bodies in the trunk, with instructions and a map to bury the corpses in the desert. Peter awakes in the hospital and his mother tells him that his father was depressed and committed suicide. When Peter decides to jump from the terrace of his building, his brother Nathan discloses that both can fly. Hiro is teleported to the Times Square and finds a comic book written by Isaac Mendez telling his saga. He goes to Isaac studio, finds him dead and is arrested by the police. A man pretending to be an exterminator bugs Mohinder's apartment, but he fights with the guy and is helped by his next door neighbor. In Los Angeles, the Police Officer Matt Parkman telepathically hears the voice of a child in a murder scene and is arrested as a suspect. Claire hides her heroic rescue in the fire and her seemingly evil adoptive father discloses her abilities in her stolen tape.

As the "Heroes" continue to test their newfound extraordinary abilities, Claire tries to maintain a normal social life when a romance with the football quarterback takes a tragic turn. While Hiro convinces his friend that they are destined to travel to America to save the world, a frightened Niki follows instructions from a mysterious, unknown source that directs her to the middle of the desert. Meanwhile, Nathan uses Peter's accident to propel his political campaign. The elusive Sylar is being hunted by both Matt and the FBI, as well as Suresh, whose father's journal leads to potential clues.

Suresh finally tracks down one of his father's fabled genetically advanced "supermen." In Las Vegas, Hiro's plan backfires when he cautiously turns time to his advantage at the gambling tables. Niki's mafia debtors use their leverage to their benefit in a more elaborate scheme, while Nathan pays a personal visit to a wealthy Vegas contributor to raise additional campaign funds. Following a tragic turn at a bonfire, Claire's uncanny healing abilities are put to the ultimate test, but according to Isaac's paintings, her future could be fraught with even more peril. Meanwhile, Matt's abilities are gauged by a pair of men who seem to know a great deal about people with special gifts.

Niki is questioned by police about her fugitive husband's whereabouts; Matt's relationship with his wife, Janice, benefits from his mind-reading abilities; Claire divulges her secret to her father; Hiro has a violent run-in with Las Vegas high rollers; Peter receives a life-changing message; and Mohinder contemplates leaving New York---and his father's research---behind.

Hiro and his buddy embark on their heroic journey to New York, when they are stopped by a Vegas high-roller who offers them a deal they can't refuse. As H.R.G sets up a meeting for his daughter Claire with her biological parents, she hopes that questions about her newfound indestructibility can be answered. Meanwhile, Isaac receives another confusing call from Hiro, but Peter is there this time to pick up the phone and relay a life-saving message. Suresh bids farewell to Eden as he heads back to India to bury his father. An unexpected visitor shows up at Niki's home.

Lyle Bennett learns of his sister Claire's secret after watching her video of her trying to kill herself. Hiro Nakamura helps D.L. Hawkins save a woman from a burning car by freezing time. Isaac Mendez has gone M.I.A. with his painting.

Back in India, Mohinder has weird dreams about his parents. Audrey and Matt talk to Ted.

As Homecoming approaches in Odessa, Claire's father makes an effort to save Claire's life. Peter, having tried to contact Hiro, flies to Texas in his effort to save the cheerleader. Hiro decided to head back in time in an effort to save the waitress, and Suresh can't get a dream out of his head and feels it has some answers about him and his father.

Claire Bennett is at home reading when the cheer leading captain walk in with a uniform and informs Claire that another cheerleader dropped out and the spot is hers if she wants it. Hiro Nakamura has traveled back in time to the Texas diner but realize he can't after she tells him she has a terminal disease. Nathan Petrelli and Peter Petrelli are preparing to take down their dad D.L. Hawkins and Niki Sanders are newly weds. Chandra Suresh has come to America to find and contact the people he thinks have taken an evolutionarily step. Sylar is the first but doesn't appear to have extraordinarily powers but then has the power to move things with his mind after he invites and kill another person on Chandra's list and then goes back to Chandra

The question on everyone's mind regarding the cheerleader is that, since she's still alive, does the bomb still go off? This is especially true for Hiro, who meets with Isaac to discuss their next course of action. Having confessed her abilities to her father, Claire seeks other answers that her friends and family can not give. Having captured Sylar, Claire's father keeps him in a room of total darkness, totally unaware of Sylar's true strength.

Nathan stops at nothing when it comes to getting some kind of help for his unconscious brother. Hiro goes on a hunt for the sword he's seen in Isaac's paintings. Nikki tries to convince the police of her need for help in dealing with her split personality.

Outside forces and new faces drive the "Heroes" into different directions.

Claire finds it increasingly difficult to keep lying to her father, all the while knowing exactly what has happened all around her, while she makes plans to visit her biological mother. Nikki's husband makes a deal for her release. Hiro's father wants him to return to Japan, and he scrambles to find a way to stay his own course, searching for the sword. Peter convinces Claude to help him understand his own powers, including Claude's invisibility.

While the scandalous truth about Claire's real father is revealed, her adoptive mother faces a crisis. Matt takes a job as a bodyguard for a crooked attorney, which puts him in the cross hairs of Linderman's new assassin. Hiro and Ando return to Las Vegas to find the sword, but get sidetracked by a damsel in distress. Suresh finds someone on the list and unknowingly puts himself in grave danger. Meanwhile, Simone turns to some unlikely help in her and Nathan's struggle to find Peter.

Peter painfully learns that someone close may have betrayed him and Claude. Matt's world spirals out of control when radioactive man Ted Sprague and Hana Gitelman, a fierce young woman with "wireless" mental abilities, drop into his life. After blood is spilled, Hiro makes a difficult decision about his mission. Claire is unable to contain her anger at her father.

With the election and NYC's destruction looming, Nathan has a disturbing face-to-face meeting with the shadowy Linderman. Hiro's attempt to steal the sword steers him into a grim new direction. Suresh makes a breakthrough on "the list" -- at great cost. D.L. begins to suspect all is not well at home. Isaac paints his most terrible painting yet. New "hero" Candice Wilmer makes an illusive debut.

After "helping" Suresh search for more people with special abilities, Sylar's rampage continues with two "heroes" being confronted by the stronger-powered serial killer. Nathan must factor what he's learned from Linderman into difficult decisions that will shape the future -- for him, his family, New York City and the world. As Thompson uses every tool at his disposal to find Claire, Linderman drafts Jessica into his far-reaching plans. Meanwhile, Hiro's resolve to "save the world" strengthens in the face of a grim reality.

Hiro and Ando find themselves five years after the destruction of New York. People with extraordinary abilities are labeled as terrorists and Sylar, who has assumed the form of Nathan, is the President.

As Nathan and his family ready for the election, Hiro and Ando face the hard part of saving the world.

Peter feels the need to control his newly absorbed power, as he overhears Sylar's thoughts on the streets of New York. Mohinder finds another hero and agrees to help find a cure for her fatal disease, as Parkman and Bennet close in on the building they are in, looking for a link that could set them free. Niki/Jessica and D.L. are convinced that Linderman is behind their son's disappearance, as Linderman convinces their son to do a job for him.

Can Sylar be stopped? Will Linderman's vision live on with Nathan? What will it take for Peter to save the world, what sacrifices will be made? With all the horrible predictions unfolding before them the heroes face moments of pain and peril in Kirby Plaza.

Four months after the events of Peter's explosion, we find the heroes at different places in their lives. Claire, HRG and family try to stay below the radar in their new town, but a classmate of Claire's with some powers of his own knows there's something different about her. Matt Parkman and Mohinder Suresh are now guardians of Molly Parker, who has been suffering from horrible nightmares about the man who is more evil than Sylar. Mohinder and HRG are still trying to take the company down. Kaito Nakamura and Angela Petrelli receive ominous notices of their impending deaths, clearly sent by one of "the elders". Nathan has pushed his family away and is in a very dark place, feeling that Peter has survived and is alive somewhere. In Ireland, we find Peter Petrelli is alive, but doesn't remember who he is. Maya and Alejandro, two new characters, are wanted for murder due to her accidentally killing multiple people because of her ability to host a plague.

At the behest of his new employers, Dr. Suresh travels to Haiti to treat a potential virus victim. The patient turns out to be a familiar face. Claire's secret may be out when a fellow student sees her regenerate a limb; that student may have his own secret however. Matt Parkman investigates a murder that affects one one of the Heroes. In 17th century Japan, Hiro is doing his best to ensure that Takezo Sensei lives up to his reputation. He has to take things into his own hands however. In Ireland, Peter Petrelli finds himself with no memory but re-discovering some of his many powers. Maya and her brother reach the Guatemala-Mexico border in their quest to travel to the USA.

Now back from Haiti, Dr. Suresh finds that his new lab in New York is Isaac Mendez's old loft. He finds the 8th of Isaac's paintings but it holds bad news for a major character. Claire is concerned that her classmate will reveal her secret but he reveals a secret of his own. Peter Petrelli assists his newfound friends and begins to question whether he wants to know his identity and his past. Still in 17th century Japan, Hiro forces the issue with Takezo Kensei in order to ensure that he lives up to his legendary status. Niki Sanders travels to New Orleans to leave Micah with a relative. Maya and her brother reach Mexico, but she has to get him out of jail.

Afraid of losing the love he thinks he's found, Peter denies his past and doesn't look in the box while an unknown woman tries to track him down. Parkman and Nathan are led to Philadelphia to track down Matt's father, unknowingly being led into a trap where Nathan stumbles into the city that blew up after all. Mohindar takes Molly to the Company in search of help for her, just as Nikki shows up, while another hero begins to discover her powers in Texas.

Having lied to her father about joining the cheerleaders, Claire decides the time has come to teach the team captain a lesson when she is told that she didn't make the squad. Having convinced Monica to come to New York, Dr. Suresh isn't at all comfortable when the Company asks him use her as a guinea pig for a variant of the vaccine. The Company backs down but he learns that Niki Sanders has been assigned to work with him. Alejandro and Maya make it to the US border only to be stopped by a citizens border patrol unit. Having painted a Menendez-like painting, Peter Petrelli heads for Montreal to see if they can get some clues as to who Peter really is. Hiro may ruin the time-line when he gives in to temptation and kisses Yaeko only to learn that Takezo Kensei was watching them. HRG man and the Haitian visit an old colleague from the Company in an attempt to locate Isaac Mendez's last paintings. They show that they are more than ready to use violence to get what they want.

Peter Petrelli finds himself in a future New York City where a virus has devastated the world's population. As he gradually regains him memory, he recognizes his mother who urges him to use his Hiro-like powers to go back in time and stop the virus before it begins. Claire and West's relationship reaches a crisis point when West realizes that her father is the same man who once kidnapped him. Suresh's loyalty to HRG man is starting to wear thin and he finally admits what he has been up to. Nathan learns that brother Peter is alive. Matt Parkman finally confronts his father in an attempt to release Molly from her coma-like state. Having fallen out completely with Takezo Kensei, Hiro attacks White Beard's camp. A new character with a familiar face, Adam Monroe, is revealed as one of the founders of the company.

Hiro learns of his father's death and travels back in time to save him only to realize that he must let events unfold as fate intended. He does however recognize his father's killer. Matt Parkman realizes that he has the ability to implant thoughts in other people's minds. He wants to know the identity of the woman in the photo with his father. When Bob and Suresh kidnap Claire Bennet, HRG and West set out to rescue her but get their own bargaining chip beforehand.

Peter Petrelli and Adam Monroe track down another founding member of the Company and learn the location of virus 183. Maya learns how to control her powers but Alejandro' distrust of Sylar leads to a deadly confrontation. Niki returns to New Orleans and tells Micah about her medical condition. When his backpack is stolen, Micah and Monica set off to retrieve it, but things don't work out as planned. Hiro decides to avenge his father's death and goes after Adam. Claire, grieving over her father's death, decides to go public with her powers in a bid to stop the Company.

Nathan, Matt, and Hiro confront Peter and Adam at the Company's facility in Odessa, TX where Adam's intentions become apparent. Micah confides in his mother and working together; he and Niki set off to rescue Monica but with deadly results. Maya and Sylar visit Dr. Suresh and she finally realizes what Sylar is really up to. Noah Bennet visits his family and begs Claire not to publicly reveal her secret.

In order to change the course of history, a scared and cynical Peter Petrelli travels back in time from four years to the day his brother Nathan revealed the existence of the super-humans and was the one who shot him. In attempting to capture future Peter, Matt Parkman gets teleported to a desolate African landscape. In Japan, Hiro takes control of his father's company when, courtesy of a DVD, he and Ando receive instructions from Hiro's late father about a deadly secret contained in the office safe. Hiro can't help but open the safe and the contents are promptly stolen by a "speedster"; a woman with super-fast speed called Daphne. Meanwhile, Nathan undergoes a religious experience while recovering from the shooting and is offered a new job in Congress by a shady blond government woman named Tracy Strauss, someone who looks remarkably like the late Niki Sanders. Elsewhere, Sylar confronts Claire, whose alone in her house, in a bid to get hold of her powers.

A egotistical and super-charged Sylar goes to the Company to kill all the leaders, and inadvertently releases 12 super-powered criminals from the place's notorious Level 5 prison block during a fight with Elle. Peter, trapped in the body of one of the criminals, is set free as well and is forced to team up with a group for a crime spree. Meanwhile, Future Peter tries to fix his mistake with Nathan, as Angela takes over the company in the wake of Bob Bishop's murder and frees Noah Bennett to help the Company track down the 12 escapees and bring them back or eliminate them. In California, Claire learns more about her powers as she recovers from Sylar's attack. Hiro and Ando travel to Paris to track down speedster Daphne Milbrook who robbed them and learn that she is working for a darker power. In New York, Maya discovers that Mohinder's injection has changed him by making him super-strong, but also altered his personality. In Africa, Matt meats Usutu, an African shaman with a familiar power of painting the future. Elsewhere, Tracy learns that she has the power to super-freeze anyone and anything while dealing with a hounded tabloid reporter seeking any dirt on her and the shady Governor Maldon who are continuing to groom Peter for a position in the U.S. Congress.

Noah Bennett is stunned when Angela Petrelli assigns him a brainwashed Sylar as his new partner to track down the escapees from the notorious Level 5, as Peter, still trapped in the body of Jesse the Sonic Man, is forced to team up with a trio of deadly super villains who are on a murderous crime spree by holding up a local bank. Future Peter eventually releases Present Peter from his body-cell and shows him his dark future. In Africa, Matt learns more about his spiritual guide, Usutu, who also has the ability to paint the future. Meanwhile, Hiro and Ando track Speedster Daphne to Berlin to recover the mysterious formula, and find out that the rouge Haitian is behind it and working for another third party. In California, Claire asks her biological mother, Meredith Gordon, to teach her how to fight. Elsewhere, Micah Sanders, mourning the death of his mother is approached by the shadowy Tracy Strauss who asks him information about her past and why she and the late Niki Sanders are very identical looking, which leads to the mysterious Dr. Zimmerman, who may hold a clue.

Having time-traveled four years in the future, the future Peter shows his younger counterpart that people have access to drugs that give them various super powers and some of them will destroy the world. Past Peter is forced to run from the dark and evil future versions of Claire, Daphne, and Knox, all of whom work as killers for government agencies to track him down. Past Peter is forced to look for allies and finds one in a very subdued version of Sylar. From his spot in Africa, Matt Parkman has a vision of his future in four years in which he is married to Speedster Daphne and is still looking after Molly Walker whom also works for the agencies. In the present, Hiro and Ando are locked away in a Level 2 prison cell where their situation starts to drive a riff between them. Tracy learns more about her origins from Dr. Zimmerman, and Nathan receives more tips from the ghost of Mr. Linderman over his position for congress. Also, Mohinder learns that the powers he gave to himself are irreversible and could lead to disaster.

Claire attempts to destroy her first target, Stephen Canfield. Hiro attempts to become friends with Daphne.

Fellow villains Knox and Daphne are sent by their emissary, Maury Parkman, on a quest to recruit Hiro and others to the Pinehearst fold. Adam Monroe is brought before the ringleader, who turns out to be the most powerful villain, who uses his power to heal. Matt Parkman arrives back in New York from his African adventure, and is confronted by Daphne with an offer to join their organization, but he instead wants a commitment from her. Hiro and Ando teleport to Africa to try to make contact with Usutu, the vision painter, for information on the persons behind all the recent events. Angela and the Company are paralyzed from recent events, and Noah Bennett is forced to team up with Sylar again to hunt down more escapees from Level 5. Peter goes to Pinehearst searching for answers, but is stunned to learn that his father, Arthur Petrelli, thought to be long dead, is the ringleader of the whole events, and who as the ability to physically absorb others powers by mere touch. Meanwhile, Claire and Sandra go on a mission to save Meredith from the clutches of Eric Doyle, a villain with abilities to control people mentally and physically. In New York, Nathan and Tracy try to trace their origins with Mohinder's help, but who has other plans for them.

Tracy and Nathan try to save themselves from a dangerous Mohinder who wants to use their synthetic power laced DNA to find a way to remove Mayas/his own powers. Mohinder turns to the dangerous, power-stealing Arthur Petrelli to help Maya, and in return, Mr. Petrelli asks for Mohinder's help in developing the secret formula to give people powers. Meanwhile, Sylar is given the task by the comatose Angela to save Peter from Arthur at Pinehearst, where he was captured and rendered powerless by his him. Also, Daphne is ordered by Mr. Petrelli to kill Matt, but finds the task difficult as she begins falling in love with him as he predicted. In Africa, Hiro is still searching for answers from the spiritual painter about who is behind Pinehearst and what their nefarious plans are for the world. In California, Elle approaches Claire and asks for her help to control her powers which leads to both of them forming an uneven alliance to venture to Pinehearst in New Jersey to find answers. Also, H.R.G. recruits Meredith as his new sidekick to track down more Level 5 escapees.

Under the guidance of Usutu, Hiro has a vision back in time one year ago to determine what forced Arthur Petrelli to fake his death and create Pinehearst. In the past, Hiro also watches the early days of the Company and how Mr. Petrelli and Mr. Linderman founded it, and their falling out with Angela who saw them as a threat to both Nathan and Peter. Also in the past, Meredith Gordon's origins are shown of how she was captured by Thompson to work for the Company, and of life of crime with her half-brother, whom is the blue-flame fire-starter Flint. Also, Sylar makes a discovery about his powers when he meets Elle for the first time and how she inspired him to kill in order to steal others powers.

Barely escaping from the evil and powerful Arthur Petrelli, Ando forces Hiro to teleport them back to Japan only to discover that Mr. Petrelli has erased most of Hiro's mind and who thinks he's 10-years-old, and still in school. Ando must try find a way to make Hiro remember his powers. Meanwhile, Sylar tries to reason with the captive Elle to force out her anger and to learn how to take her powers without killing her. Mr. Petrelli sends Knox and Flint out after Claire and Peter who try to find a way to outwit their pursuers. Matt Parkman tries to scan the comatose Angela Petrelli's mind to try to save her and learns that Daphne is a double-agent assigned to watch over him and that Mr. Petrelli has something against her. While Suresh continues to unsuccessfully search for the secret to the formula to give people powers, Nathan and Tracy pay a visit to Pinehurst where they meet with the manipulative Arthur Petrelli who offers Nathan the world in exchange for his loyalties and help. Nathan declines, but Tracy, eager to gain more power in politics, accepts.

Having reestablished control over the Company, Angela sends Nathan and Peter to Haiti to find the power-suppressing Haitian to bring him back to the USA to help in their fight against Arthur Petrelli and the evil Pinehurst. Hiro and Ando travel to New York to come back into the fold and ask for Parkman's help. Hiro, having lost part of his mind, but not his powers, teleports himself, Ando and Parkman to Kansas to Daphne's home to find out what Mr. Petrelli has on her. Also, Sylar teams up with Elle to try to capture Claire to bring her to Pinehurst to give her to Suresh to experiment on as the missing catalyst to the formula. But everything changes when a prolonged solar eclipse happens, which renders the heroes and villains powerless, stranding Peter and Nathan in Haiti with the Haitian who is trying to capture the powerful Voodoo witch-doctor Baron Samedi. In Kansas, Parkman must find a way into the Millbrook house without his mind-reading powers, and learns what Daphne is without her super-speed powers. In California, the powerless Elle and Sylar try to capture Claire, who accidentally gets shot, and Nathan seeks revenge.

In Haiti, Peter and the Haitian try to rescue Nathan who has been captured by the sinister Baron Samdei and his militia army. At Pinehurst, Mohinder finds himself a captive by Arthur who wants his powers back for a grand master plan, in which Mohinder attempts to find Maya to ask for help since she may be powerless too. In Kansas, Matt Parkman learns the true nature of Daphne without her super speed, while Ando and an immature Hiro seek answers to their powerlessness in a comic book store in the late Isaac Mendez's '9th Wonders' series detailing their conflict as it happens. In California, the powerless Claire is taken to the hospital dying from her wounds, while Sylar and Elle turn from hunters to the hunted when the vengeful Mr. Bennet attempts to track them down to kill them.

Having traveled back in time 16 years, the immature Hiro seeks out his late mother to try to get his memories back, while Claire has a run-in with a younger Noah Bennett when he was assigned by the company to look after the infant Claire and how she may have become the catalyst for the secret formula. Back in the present, Nathan returns to Pinehurst where Tracy introduces him to a group of U.S. Marines that Arthur has recruited to be his army of super-solders once Mohinder gets the catalyst for the ability-giving formula correct and which hopes the formula will be able to cure his disease... and begin Mr. Petrelli's quest for world domination. Peter and the Hatian return to New York and are sent by Angela in desperate attempt to break into Pinehurst to kill Arthur Petrelli before he can complete the formula. Meanwhile, Ando, Parkman, and Daphne seek out a bicycle messenger who may have the last '9th Wonders' comic book works to learn more about the future and where Hiro is and what to do to save him. Elsewhere, Sylar goes rogue once again by disposing of Elle, and then decides to go after both the heroes and villains to steal their powers for himself.

Noah, Claire, Angela, and Meredith find themselves trapped at the Primatech by Sylar who locks them in the building and subjects them all to various mind games. Meanwhile, Matt, Daphne, and Ando seek refuge at the Mendez loft where Daphne plans to steal a sample of the power-giving formula to give to Ando who wants to rescue the powerless Hiro still trapped 16 years in the past, who continues to struggle to find his true origins with his younger self. Back in the present, Peter faces off against Nathan, Tracy and the security detail at Pinehurst to stop Mohinder from reproducing the formula, and finds allies in the form of Knox as well as Flint who also want to stop the production of the formula, leading to a fiery showdown for all.

Two months after the destruction of both the Primatech and Pinehurst, and the death of Arthur Petrelli, the now-villainous Nathan returns with a vengeance by persuading the U.S. President and the government to round up all people with abilities for containment and disposal, leading to Claire, Ando, Peter, as well as Tracy to become fugitives from the people who were their former allies. In Japan, a powerless Hiro tries to live through the super-charger Ando as his latest partner. In New York, Peter struggles to find a life for himself as a paramedic, but finds that his cannot hide from his past. Claire learns about Nathan's and Angela's plans for interment of people with abilities and sets out to warn Matt Parkman who learns more about his abilities from the spirit of the African spiritualist Usutu. Elsewhere, Syler travels to Baltimore to locate his long-lost father and ends up being the only one who escapes from a government dragnet led by a mysterious agent known only as 'the Hunter'. Mohinder also learns that he has been targeted, and that Noah Bennett is apparently working with Nathan as well.

Following the plane crash, the surviving heroes must team up with one another to try to survive the manhunt. Claire is quickly captured by Noah who takes charge of a "kill squad" to find the remaining people with abilities while Nathan deals with the overzealous 'hunter' Emile Danko whom becomes obsessed with tracking down all people with special abilities in his own lethal way. Mohinder and a powerless Hiro must rely on Matt Parkman's spiritual guide to help them. Daphne makes contact with Ando to help her find Matt, unaware of the people now targeting them. In New Jersey, Syler takes refuge in the house of an agent and tortures him to try to get information to what's going on and he forms an unlikely alliance with the agent's son Luke Campbell. Also, Peter teams up with Tracy to look for help, while she begins having second thoughts about running.

Imprisoned inside the super-secret 'Building 26' which is Nathan's base of operations to experiment and terminate people with abilities, Tracy struggles to survive various "heat" experiments as well as wait for an opportunity to try to escape. While the ruthless Hunter Davko obsessively continues to track down the heroes with the obsession of killing them all, Nathan deals with the President of the USA who begins to investigate Nathan's activities and tactics to hunt down the "targets". Meanwhile, Syler continues his quest to locate his biological father with both help and inference from Luke Campbell, as well as government agents now after both of them. Hiro, Ando, and Matt travel to India to find a new ally with abilities to help them survive. In California, Claire faces the wrath of her father.

Now on his own, Sylar finally finds his biological father, Samson Gray, a reclusive, lung-cancer ridden taxidermist, to confront him with questions about his past, but soon learns that Samson is not who he appears to be. Meanwhile, Nathan continues to lock horns with Danko over the hunter's tactics to eliminate people with abilities, after he tries to frame Parkman for an attempted suicide bombing. This leads to both Nathan and Danko going behind each others back to unseat the other. Nathan becomes wary about Danko going rogue and the hunter interrogating Tracy, as well as Nathan's mother, Angela, about Nathan's own ability. In California, Claire takes Alex's old job at the comic book store where she is given a message by 'Rebel' to help out her former nemesis, the puppet master Eric Doyle, when he too is targeted by rogue agents. Also, Hiro and Ando return to California where they are led by clue from Rebel... to an infant Matt Parkman.

The identity of "Rebel" is revealed with chilling consequences - Emmy Award-Winner Zeljko Ivanek, Brea Grant and Swoosie Kurtz Guest Star.

Hiro and Ando set out to find Matt Parkman with his infant son, but soon learn that the infant's powers hinder their travel plans. Meanwhile, the shape shifting Sylar begins to use his new powers to harass Bennet by impersonating his wife, Sandra, knowing he will find out. An angry Matt Parkman begins investigating the sadistic Danko to see revenge for Daphne's death and learns more about his pursuer when he meets his Slavic girlfriend Alena. Mohinder learns more about his father's work about a mysterious place called Coyote Sands in which Angela and Peter make contact with Nathan and Clare where Angela takes them to the remote location where a secret about Angela's past lies buried.

Sylar begins to feel confused and more uncertain about himself when his new shape-changing powers begins to get out of control. He begins to imagine his late mother giving him advice on what to do, while Danko continues to use him to find and kill people with abilities and wants to zero in on 'Rebel'. When Sylar discovers that Rebel is in fact Micah Sanders, he saves him. Sylar decides to change his ways after figuring out that Danko is plotting a so-called 'Final Solution' to exterminate all people with abilities once and for all. Meanwhile, Parkman plans to return to his home in California with his infant son unaware that there are more kill-squad agents after him, Hiro and Ando rashly decide to make a heroic, and probably futile, attempt to make an assault on Building 26.

Nathan and Peter try to find the shape-shifting Sylar before he can make contact with the President and assume his form as well. Clare goes off to try to stop Sylar on her own, only to end up as a captive. Meanwhile, Hiro and Ando make a rash attempt at stopping time so they can break into Building 26. They hope to free those that still survive and have powers, while Danko, framed by Sylar for the murder of an agent, has a talk with Noah Bennett over their views on fighting this war. Elsewhere, Angela meets with Matt to ask for his help to save Nathan, when she has a dream about him being in danger from Sylar.

Claire, back home in California, begins attending college, but is having difficulty adjusting when a mysterious death of a student during the orientation puts her back in the spotlight. In Japan, Hiro and Ando continue their quest to help people with abilities and go so much as to advertise themselves. Meanwhile, Angela fears Nathan/Syler will discover his true identity. Matt tries to settle down back in Los Angeles and raise his son and not worry about unexpected visitors. Elsewhere, Peter is using his ability for good when a mysterious carnival clan, led by Samuel Sullivan, arrives in town which could spell trouble for him and everyone else.

As Hiro's life continues to hang in the balance, he distracts himself with saving the lives of others. Meanwhile, Angela tries to help the new "Nathan" remember his past, at the risk of his remembering too much. Elsewhere, Tracy is determined to get her old job back, but soon realizes that she needs to make more of an impact.

Samuel prepares for new additions to his family, while Lydia warns him of the consequences. Claire discovers that her roommate Gretchen may have a hidden agenda. Meanwhile, Peter finds an unexpected way to connect with Emma, who would prefer to stay distant. Elsewhere, a different side of Sylar emerges as he desperately tries to remember the person he used to be.

Under Samuel's guidance, Sylar starts on a path to rediscover his true identity. Hiro helps Emma accept and understand the great possibilities that go along with having an ability. Meanwhile, Peter enlists HRG to help him find a healer who can save Hiro's life.

When Hiro travels three years into the past, he has a second chance to save Charlie from the hands of Sylar. However, Samuel's presence serves to complicate Hiro's mission even further. Elsewhere, H.R.G.'s past with his Primatech partner is revealed.

Samuel learns just how powerful he can become and takes dangerous measures to reach his full potential. Meanwhile, as Tracy begins to lose control of her ability, one of her own comes in harms way.

H.R.G. hosts a non-traditional Thanksgiving dinner by inviting Claire over at his apartment for dinner. But the dinner becomes more awkward and uncomfortable when Noah invites his former co-worker Lauren, while Noah's ex-wife, Sandra, also shows up with her newest beau, a younger man named Doug Douglas, whom like her also has a small dog fetish. Claire is also conflicted about where she wants to be, in which Noah invites over Gretchen to try to lift up her spirits. Meanwhile, the Petrelli family gets a surprise guest at their table when Sylar shows up having reclaimed Nathan's body and holds both Peter and Angela at his mercy. Elsewhere, Samuel continues to hold Hiro hostage as part of some grand master plan, as Lydia goes to Hiro in search of the truth about Samuel.

H.R.G. is greeted by some unexpected visitors and Samuel's grand plan begins to come to fruition. Meanwhile, Peter struggles to accept the truth and takes extreme measures to get what he wants. Elsewhere, Claire's journey leads her to an unexpected destination.

Samuel goes off and tries to bring Emma into the fold by manipulating her about how special her sight-of-sound powers are, while back at the Sullivan Brothers Carnival, Claire becomes more suspicious about Samuel's intentions and deals with not only Samuel's right hand, Replicating Man, Eli, but also the Puppet Master Eric Doyle. A delirium-stricken Hiro returns to Japan and tries to convince Ando in code-talk to help rescue Mohinder from a lunatic asylum in Florida where Hiro forcibly placed him for protection from Samuel.

H.R.G. recruits Matt to help him take down Samuel, as they use his long-lost love, Vanessa, to lure him to them, but Samuel has his own plans for Vanessa in the works. Meanwhile, Hiro and Ando go to extreme lengths to save Dr. Suresh. Elsewhere, Peter's introduction of Emma to his mother brings forth visions of a very grim future.

Hiro's life hangs in the balance as his brain tumor worsens, prompting him to subconsciously deal with some of his past decisions. Meanwhile, Sylar pays Claire an unexpected visit to get answers as to why he isn't quite himself. Elsewhere, Samuel's plan to impress his long-lost love, Vanessa, takes a terrifying turn.

Samuel's ultimate plan spells disaster for thousands.

When Hiro travels three years into the past, he has a second chance to save Charlie from the hands of Sylar. However, Samuel's presence serves to complicate Hiro's mission even further. Elsewhere, H.R.G.'s past with his Primatech partner is revealed.

As Hiro's life continues to hang in the balance, he distracts himself with saving the lives of others. Meanwhile, Angela tries to help the new "Nathan" remember his past, at the risk of his remembering too much. Elsewhere, Tracy is determined to get her old job back, but soon realizes that she needs to make more of an impact.

Back in India, Mohinder has weird dreams about his parents. Audrey and Matt talk to Ted.

When Nikki wakes up, she sees the two criminals dead in her garage. She brings her son and finds a brand new Cadillac in her name and the bodies in the trunk, with instructions and a map to bury the corpses in the desert. Peter awakes in the hospital and his mother tells him that his father was depressed and committed suicide. When Peter decides to jump from the terrace of his building, his brother Nathan discloses that both can fly. Hiro is teleported to the Times Square and finds a comic book written by Isaac Mendez telling his saga. He goes to Isaac studio, finds him dead and is arrested by the police. A man pretending to be an exterminator bugs Mohinder's apartment, but he fights with the guy and is helped by his next door neighbor. In Los Angeles, the Police Officer Matt Parkman telepathically hears the voice of a child in a murder scene and is arrested as a suspect. Claire hides her heroic rescue in the fire and her seemingly evil adoptive father discloses her abilities in her stolen tape.

Hiro and Ando find themselves five years after the destruction of New York. People with extraordinary abilities are labeled as terrorists and Sylar, who has assumed the form of Nathan, is the President.

Hiro's life hangs in the balance as his brain tumor worsens, prompting him to subconsciously deal with some of his past decisions. Meanwhile, Sylar pays Claire an unexpected visit to get answers as to why he isn't quite himself. Elsewhere, Samuel's plan to impress his long-lost love, Vanessa, takes a terrifying turn.

H.R.G. recruits Matt to help him take down Samuel, as they use his long-lost love, Vanessa, to lure him to them, but Samuel has his own plans for Vanessa in the works. Meanwhile, Hiro and Ando go to extreme lengths to save Dr. Suresh. Elsewhere, Peter's introduction of Emma to his mother brings forth visions of a very grim future.

Having traveled back in time 16 years, the immature Hiro seeks out his late mother to try to get his memories back, while Claire has a run-in with a younger Noah Bennett when he was assigned by the company to look after the infant Claire and how she may have become the catalyst for the secret formula. Back in the present, Nathan returns to Pinehurst where Tracy introduces him to a group of U.S. Marines that Arthur has recruited to be his army of super-solders once Mohinder gets the catalyst for the ability-giving formula correct and which hopes the formula will be able to cure his disease... and begin Mr. Petrelli's quest for world domination. Peter and the Hatian return to New York and are sent by Angela in desperate attempt to break into Pinehurst to kill Arthur Petrelli before he can complete the formula. Meanwhile, Ando, Parkman, and Daphne seek out a bicycle messenger who may have the last '9th Wonders' comic book works to learn more about the future and where Hiro is and what to do to save him. Elsewhere, Sylar goes rogue once again by disposing of Elle, and then decides to go after both the heroes and villains to steal their powers for himself.

Nathan stops at nothing when it comes to getting some kind of help for his unconscious brother. Hiro goes on a hunt for the sword he's seen in Isaac's paintings. Nikki tries to convince the police of her need for help in dealing with her split personality.

Under Samuel's guidance, Sylar starts on a path to rediscover his true identity. Hiro helps Emma accept and understand the great possibilities that go along with having an ability. Meanwhile, Peter enlists HRG to help him find a healer who can save Hiro's life.