Deep below Primatech Paper in Odessa, TX, Peter s (Milo Ventimiglia) reunion with Nathan (Adrian Pasdar) turns violent when the brothers, Matt (Greg Grunberg) and Hiro (Masi Oka) all clash thanks to Adam (David Anders) and his pursuit of the deadly Shanti Virus. After watching his heroic cousin captured by a street gang, Micah (Noah Gray-Cabey) turns to the one person who can help him save Monica (Dana Davis) -- his mom (Ali Larter). Meanwhile, Maya (Dania Ramirez) tragically learns how much of a monster Sylar (Zachary Quinto) really is during his kidnapping of Molly (Adair Tishler) and Suresh (Sendhil Ramamurthy). Meanwhile, Elle (Kristen Bell) decides to play hero to get back into her father s (Stephen Tobolowsky) good graces. Jack Coleman, James Kyson Lee and Hayden Panettiere also star.

Unforeseen challenges and dangers strike the "Heroes" hard, a new "wireless" hero named Hana debuts -- Peter (Milo Ventimiglia) painfully learns that someone close may have betrayed him and Claude (guest star Christopher Eccleston). Matt's (Greg Grunberg) world spirals out of control when radioactive man Ted Sprague (guest star Matthew John Armstrong) and Hana Gitelman (guest star Stana Katic), a fierce young woman with "wireless" mental abilities, drop into his life. After blood is spilled, Hiro (Golden Globe nominee Masi Oka) makes a difficult decision about his mission. Claire (Hayden Panettiere) is unable to contain her anger at her father (Jack Coleman).

When agendas clash, a hero dies -- Convinced that the Company is close to finding them, H.R.G. (Jack Coleman) prepares the family to run -- but Claire (Hayden Panettiere) has other ideas. Hiro (Masi Oka) returns from the past and learns of his father s death. Grief-stricken, he flings himself into past and makes a stunning personal discovery. After a charged first encounter with Elle (Kristen Bell), Suresh (Sendhil Ramamurthy) makes a decision that could change lives. Meanwhile, Matt (Greg Grunberg) struggles with his expanding mental abilities. Maya (Dania Ramirez) and Alejandro s (Shalim Ortiz) relationship is tested as they travel with Sylar (Zachary Quinto). Peter (Milo Ventimiglia) meets someone who could unlock his past. Noah Gray-Cabey, Dana Davis, James Kyson Lee, Ali Larter and Adrian Pasdar also star. Nick D Agosto, George Takei, Adair Tishler and Stephen Tobolowsky guest star.

As people around the world find their lives disrupted by their new, extraordinary abilities, authorities investigate several bizarre, gruesome murders -- Greg Grunberg joins the cast as Matt Parkman, a policeman who can hear other people's thoughts, Clea Duvall and Nora Zehetner guest star. -- Outside a bizarre, gruesome crime scene, Los Angeles beat cop Matt Parkman is the only one who can hear the cries of a missing little girl. Claire almost reveals her secret ability to the entire school after learning that her injury attempt tape has disappeared. Thinking she?s going crazy, Niki loses another block of time after waking to find some brutally murdered thugs in her garage, only to be confronted by Social Services about son Micah. While office drone Hiro investigates New York, Nathan confronts Peter following his plunge off a building.

As Linderman arrives, Nathan considers the cost to win the election; Malcolm McDowell, Eric Roberts and George Takei Guest-Star -- Poised to become a member of Congress and maybe more, Nathan (Adrian Pasdar) considers the cost to those he loves, along with his mother's (guest star Cristine Rose) advice and Linderman's (guest star Malcolm McDowell) prophecy. As he prepares to face Sylar (guest star Zachary Quinto) to the death, Hiro (Golden Globe nominee Masi Oka) learns of his linage from his father (guest star George Takei). While various "heroes" fatefully arrive in New York City, Peter (Milo Ventimiglia) and Claire (Hayden Panettiere) attempt to leave the city before the foretold explosion. H.R.G. (Jack Coleman) and Matt (Greg Grunberg) learn the surprising truth behind the tracking system used on people with special abilities.

Greg Grunberg on the buildup to a stunning season finale.

Greg Grunberg's choice between yoga and jogging is clear ...

Greg Grunberg on the buildup to a stunning season finale.

Greg Grunberg's choice between yoga and jogging is clear ...

Nikki Boyer talks to actor Greg Grunberg at the Heroes wrap party.