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As Noah's life hangs in the balance, Samuel prepares to kill thousands and Peter and the others must band together to stop him and save Emma.

While Peter tries to save Sylar based on his precognitive vision of Emma, Lauren goes after Samuel.

The new and different Sylar pays Matt a visit, while Peter tries to warn Emma that Samuel isn't what he seems. Meanwhile, Noah begins his plan to infiltrate the carnival and capture Samuel.

Sylar visits Claire, while Hiro's past decisions manifest subconsciously due to his brain tumor. Meanwhile, Samuel tries to impress Vanessa, his long-lost love, but things don't go as planned.

While Hiro and Ando attempt to save Suresh, Bennet tries to expose Samuel's weakness in his attempt to defeat the carnival leader.

Claire joins the carnival but begins to suspect Samuel has a secret agenda. Bennet recruits Matt in his battle against Samuel, while Hiro goes to help a friend.

Claire joins the carnival but begins to suspect Samuel has a secret agenda. Bennet recruits Matt in his battle against Samuel, while Hiro goes to help a friend.

Noah gets some unexpected visitors, while Claire arrives at the carnival as Samuel's plans progress. Elsewhere, Peter confronts Sylar and discovers that extreme measures are necessary to stop him.

As Noah hosts a thanksgiving dinner, an unexpected guest visits the Petrellis. Meanwhile, Lydia tries to discover the truth about one of the carnival's secrets.

As Matt continues his battle to resists Sylar's mental domination, Tracy struggles to control her ability and Samuel learns how to tap into the full power of his.

Claire investigates the sorority attacks, which may have a link to Noah. Elsewhere, Peter finds his job performance improved after gaining a new ability, which also provides a means to help Emma, and Sylar continues his assault on Matt.

A trip into the past may give Hiro another chance to save the love of his life.

Sylar continues to torment Matt. HRG and Tracy help a young boy who is has suffered many hardships in his life. Claire and Gretchen have a problem with their new sorority sisters hazing them.

Sylar starts to find his true identity. Peter and HRG go on a quest to find someone that can save Hiro.

Lydia cautions Samuel against bringing in new members to their clan. Peter tries to connect with Emma, who wants nothing to do with him, and Sylar struggles to find the person he once was.

When worlds collide: Sylar digs himself out of the dirt, alerting Samuel to his impending arrival. Ernie Hudson guest stars.

As "Nathan" starts displaying new powers, he has visions of an incident from his past involving a young girl and decides to investigate. Hiro tries to save a co-worker and learns a truth about himself. Tracy tries to regain her old life and job.

Peter faces unexpected consequences for his heroic acts and encounters a reluctant new hero. As Claire continues to adjust to college life, she must figure out how to deal with her ability having been revealed. Meanwhile, Samuel moves heaven and earth to recapture the memories of his late brother Joseph. Elsewhere, Matt struggles with his internal demons as Sylar mysteriously resurfaces.

Claire is having difficulty adjusting to college when a mysterious death puts her back in the spotlight. Hiro and Ando continue their quest to help people and go as far as to advertise themselves. Angela fears Nathan will discover his true identity, Matt just wants to settle down and raise his son and not worry about unexpected visitors. Meanwhile, Peter is using his ability for good and a mysterious carnival clan led by Samuel arrives in town.

Nathan faces off against Sylar to keep him from meeting the President. Sylar has his own plans for his new partner. Meanwhile, Hiro learns that there are repercussions to regaining his ability. Elsewhere, Matt will do whatever it takes to protect his family

Hiro and Ando take extensive measures to bring down Building 26. As Sylar continues with his unusual partnership, he has an unexpected identity crisis. Meanwhile, Matt begins to realize he has new priorities now that he is a father, and Nathan sets out to try to fix the wrongs of the government operation he began.

With help from Peter, Claire, Nathan, and Bennet, Angela is able to uncover her past, revealing dark secrets that have long remain hidden. Meanwhile, Mohinder learns that his father was involved in a secret government operation.

As Danko continues to be in charge of the operation, someone close to him is put at risk. Bennet's life continues to spiral downhill with his marriage on the brink of its breaking point. Meanwhile, Hiro and Ando bring a special delivery to Matt and Angela delves into her past.

The heroes try to mend their broken relationships as Nathan and Claire seek refuge in Mexico and Peter and Angela hide out in a church. Danko's bid to wipe out the superpowered population intensifies as he unites with a surprising new ally.

The identity of "Rebel" is revealed. Noah wants Danko to let Tracy go in the hope that she will lead them to Rebel. Hiro and Ando continue with the mission that Rebel entrusted to them, to keep the new hero safe.

While Nathan helps Matt defuse an explosive situation, Sylar finally catches up to Samson Gray for a father-and-son chat.

Matt receives a tip from "Rebel" and heads to Building 26 with Peter to save Daphne and find the files that will expose Nathan's government plot. Claire partners up with an unlikely source to smuggle Alex out of the city. Sylar and Luke continue on their road trip, and Sylar begins to recall memories of his father that lead him to the truth about his mother. Meanwhile, The Hunter puts his plan into action, resulting in an explosive ending.

HRG and Matt are thrust into a series of mind games to uncover the truth about Nathan's plans. Peter gets to meet The Hunter in person.

As the President begins to investigate Nathan's activities, Sylar prepares to find his father. Hiro, Ando, and Matt travel to India to find a new ally, and Claire faces her father's wrath to protect a new friend.

Our heroes truly become fugitives, and they are on the run from one of their own. Sylar begins the search for his father, and Matt's paintings reveal a dark fate.

Months after explosions brought down Pinehurst and Primatech, our Heroes try to put the past behind them and begin new lives. Now powerless, Hiro tries to train a reluctant Ando to be a true superhero. Suresh returns to life as a taxi driver, Peter is back to saving lives, and Daphne and Matt try to live as a normal couple. Claire's attempt to live a regular life is cut short when she uncovers a deadly plot orchestrated by Nathan to track down and capture those with abilities. Meanwhile, Sylar begins the search for his real parents.

Following the showdown against Arthur, Nathan and Peter find themselves pitted against one another, and Nathan makes a decision that will have an effect on the entire world. Meanwhile, Sylar holds Claire, H.R.G., Meredith and Angela hostage at Primatech; Ando, Matt and Daphne try to rescue Hiro and find their only hope may lie in Suresh.

Hiro and Claire unite in their bid to stop Arthur by traveling back in time. Peter and the Haitian must face Sylar in order to get to Arthur.

The eclipse plays havoc with superpowers, forcing Ando to seek out two comic book fans to help Ando recover his memory. Meanwhile, HRG hunts down Sylar and Elle after Claire is critically injured, and Nathan and Peter help the Haitian in battle against his brother, Brother Samedi.

The dark eclipse plays havoc with the heroes' powers. Arthur orders Elle and Sylar to bring in Claire. Hiro, Ando, and Matt follow Daphne to her hometown to learn what hold Arthur has on her, and Peter and Nathan travel to the Haitian's hometown to recruit him for the war with Pinehearst.

Nathan learns of his father's plans, while Flint and Knox launch attacks on Hiro, Ando, Peter, and Claire. Meanwhile, Matt tries to revive Angela, Sylar meets with Elle, and Mohinder begins testing of his newest superpower formula.

Hiro attempts to delve into Arthur Petrelli's past to uncover the mystery behind him creating a rival company Pinehearst and his hatred towards Angela. Sylar stricken by guilt tries to stop his murderous ways with HRG and Elle vying for his blood. Meredith's training goes up in smoke with the arrival of her brother.

Trapped, Nathan and Tracy must fight to save their lives against Suresh, who has changed dramatically. Elle returns with shocking news for Claire and her family. Meanwhile, Angela tries to convince Sylar to save Peter; Daphne is ordered to kill Matt or she will be killed herself; and Hiro questions Usutu's advice.

As Hiro and the others receive offers to Pinehearst Industries, Peter has a shocking meeting with its founder. Meanwhile, Claire and her mother join forces to save Meredith from Doyle, who has the ability to take mental and physical control of others; and Nathan takes Tracy to Suresh hoping for an explanation of her abilities.

Claire vies to take down Stephen Canfield, a level 5 who can create black holes, but is unaware that others are close behind. Peter leaves the grisly future only to find that the experience has changed him forever. Meanwhile, Hiro befriends Daphne and Knox when Adam Monroe is unable to get them to "the formula"; Suresh's need to fix his research puts Maya in danger; and the true identity of Linderman is revealed.

Peter and his future self travel four years into the future and see a timeline which everyone has abilities. When his future self is captured, Peter turns to an unexpected ally to gain the power he needs to save the world. In the present, Hiro and Ando are forced to ally with Angela Petrelli to recover the missing formula... and seek out the one person who has the knowledge they seek. Meanwhile, Suresh lets his impulses get the best of him; Matt sees his future wife and child in a precognitive vision; and Linderman and Molly make their return.

Four villains -- Knox, Flint, The German and Jesse -- break into a bank and take hostages along the way, leading Angela to send H.R.G. and his new partner after them. Meanwhile, Hiro and Ando follow Daphne, but run into The Haitian along the way; Peter must figure out what he lost in order to prevent a disasterous future; Tracy leaves Washington, D.C. to uncover information about Niki; and Meredith teaches Claire how to fight.

Angela and Peter square off over how to prevent a seemingly unstoppable worldwide catastrophe. Sylar heads up an attack on the Company's main facility, but is shocked by what he finds on Level 5. While battling Elle, a dozen criminals with potentially devastating abilities are able to escape the facility. Meanwhile, Claire makes a discovery about her abilities; Hiro and Ando follow Daphne to Paris; Suresh's research, as well as his relationship with Maya, progress; and Matt finds a guide to lead him through unfamiliar territory.

Moments after the press conference shooting, the identity of Nathan's assassin is revealed, resulting in Peter and Greg delving into an unknown world. Sylar -- now with his powers partially restored -- visits Claire with the motive of giving his powers a boost that would make him an unstoppable force. Across the globe in Tokyo, Hiro and Ando must guard a family secret that, if revealed, could tear the planet apart; and learn that speedster Daphne, may have a hand in a grim future. In New York City, Maya and Suresh have a breakthrough that may change the world forever.

Before the third season premiere, a brief recap of Seasons 1 and 2 and interviews with the cast at the premiere party is shown.

At Primatech Paper in Odessa, Texas, Peter and Nathan reunite, but the tender moment turns violent when the Petrelli brothers, Matt and Hiro all butt heads due to Adam and his pursuit of the Shanti Virus. In New Orleans, Micah turns to Niki to help save Monica from a deadly street gang. Meanwhile, Maya sees Sylar's true colors when he kidnaps Molly and Suresh, and Elle must be a hero to win back her father.

After tracking down the last person in the company photo, Peter heads to Primatech Paper in Texas with his new ally to destroy the virus that will kill 93 percent of the population if not stopped in time. Niki returns to New Orleans and meets with Micah, while Monica pushes her abilities to the limit. Hiro sets out to find his father's killer, while Maya must choose between her brother and Sylar.

Bennet, worried that The Company is about to find them, prepares his family to go on the run, but Claire has other ideas. Hiro returns to the present from feudal Japan and learns his father's fate. While grieving, Hiro transports himself back into the past and makes a shocking discovery. Meanwhile, Matt has difficulty expanding his abilities and confronts Angela Petrelli about who really killed Kaito.

The series flashes back to the events of the four months between the end of season 1 and the beginning of season 2, as Alejandra and Maya begin their journey to the U.S., Peter and Nathan's final fate is revealed, and the details of D.L.'s death are shown.

Peter and Caitlin are thurst into a terrible situation after another one of Peter's abilities reemerges, and they witness first-hand how deadly the virus attacking those with abilities can be. Matt, Nathan, Niki, Suresh and Bob all work together to battle Molly's "nightmare man." Despite Claire's efforts to keep her father's identity hidden, West uncovers the truth. In feudal Japan, Hiro and Kensei's journey takes its final turn.

Suresh must examine his values while working with the Company while H.R.G. travels to the Ukraine to visit a Russian mentor with information on the missing paintings. West helps Claire teach the head cheerleader, Debbie, a lesson after telling Claire she's "not extraordinary" enough to be on the squad. Meanwhile, at the U.S. border, Alejandro becomes suspicious of Sylar; Peter and Caitlin head to Montreal to find the doorway in Peter's picture, and their findings leave them with more questions than answers; and Hiro's feelings for Yaeko may have ruined history forever.

In Ireland, Peter tries to move beyond his past, but soon discovers that Elle, a mysterious woman, would go to any length necessary to find him. Matt strikes an unexpected ally to head with him to Philadelphia to find the "boogyman" following Molly being attacked. Meanwhile, Suresh has a meeting with his new partner and receives a disturbing assignment; Monica tries to adjust to her life as a hero; H.R.G. has to go to lengths to protect his family; and Hiro continues to try to fix the past while Ando tries to put together what happened to his friend.

At a local fast food restaurant, Monica Dawson begins to experience some new abilities. Angela Petrelli makes a shocking confession as new information concerning past heroes is revealed. Matt has Molly locate the "boogyman" on a map, but the results are terrible for everyone. Across the border, Maya and Alejandro make a startling discovery.

West and Claire exchange secrets' Maya is forced to use her abilities to get Alejandro out of prison. Hiro in the past makes contact with Ando in the present day. Sylar finds himself recovering on a beach with a new ally. Niki and Micah go to visit a relative, while Peter helps out the Irish gang. And Suresh returns to New York and finds a previously undiscovered Mendez painting that foreshadows the death of someone dear to him.

With one person dead, Matt goes to an unlikely source for help as attacks continue. Claire finds it difficult to hide her abilities at her high school after a fellow student with a secret nearly jeopardizes her cover. Maya and Alejandro's abilities become a threat to others as they cross into Mexico. Meanwhile, Hiro, still in feudal Japan, tries to fix any damage his presence in the past may cause the future; Suresh has to track down the Haitian; and another lost hero joins an Irish gang in order to find clues to unlock his past.

Volume II of Heroes begins as Peter, Nathan and Matt's fates are revealed. As everyone tries to move on following the showdown between Sylar and Peter, a new force emerges that's working against the heroes. H.R.G. relocates his family to California and tries to live with Claire under the radar, but that proves to be harder than expected. Meanwhile, Hiro finds himself in feudal Japan where he meets his hero Takezo Kensei. Elsewhere, twins Maya and Alejandro Herrera try to get into the U.S. by crossing the Mexican border in order to get help with their deadly abilities.