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.

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.

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.

H.R.G.'s past catches up to him as Matt and Ted Sprague come to Texas looking for answers, and take him, his wife, son and Claire hostage -- leading to a tragic, explosive showdown.

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.

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.

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.

Micah warms his way into his cousin's heart by using his powers. Matt gets closer to finding some answers surrounding the mysterious mark on Hiro's father's photo and asks Molly to help him. Nathan's mother confesses to killing Hiro's father, and Claire grows closer to the classmate who can fly.

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.

In flashbacks, we learn what happened to the heroes in the four months after the events at Kirby Plaza. Maja learns of her deadly powers at her brother Alejandro's wedding. Niki starts a Company-sponsored drug program but stops taking the medication only to realize that another hidden personality has emerged. Imprisoned by the Company, Peter Petrelli meets the now familiar Adam Monroe and we learn how he ended up in the shipping container destined for Ireland.

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.

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.

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.

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.

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.

Claire is determined to get to the bottom of the Sorority Rush attacks on her own, until H.R.G. intervenes only to realize he may be the source of her troubles. Meanwhile, Peter's new ability is a perfect fit for his job and gives him the opportunity to help Emma accept her new life. Elsewhere, Sylar's battle at gaining full control over Matt's body escalates -- with potentially dangerous implications at stake.

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. 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.

Peter is forced to travel into Sylar's mind to ask for him to save Emma and the two of them find themselves in a limbo state-like deserted city where they try to find a way out. Meanwhile, Samuel tries to further manipulate Claire by showing the past of Noah's in image flashbacks showing his first wife, and the reasons why he came to work for The Company. Also, a wounded Lauren meets with Emma for medical treatment and to try to get her to listen about Samuel's nefarious plans.

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.

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.

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.

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 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 flashbacks, we learn what happened to the heroes in the four months after the events at Kirby Plaza. Maja learns of her deadly powers at her brother Alejandro's wedding. Niki starts a Company-sponsored drug program but stops taking the medication only to realize that another hidden personality has emerged. Imprisoned by the Company, Peter Petrelli meets the now familiar Adam Monroe and we learn how he ended up in the shipping container destined for Ireland.

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.

Claire is determined to get to the bottom of the Sorority Rush attacks on her own, until H.R.G. intervenes only to realize he may be the source of her troubles. Meanwhile, Peter's new ability is a perfect fit for his job and gives him the opportunity to help Emma accept her new life. Elsewhere, Sylar's battle at gaining full control over Matt's body escalates -- with potentially dangerous implications at stake.