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.

As Nathan and his family ready for the election, Hiro and Ando face the hard part of saving the world; Eric Roberts, Rena Sofer guest-star. -- Now knowing what's at stake if they fail in their mission, Hiro (Golden Globe nominee Masi Oka) and Ando's (James Kyson Lee) determination to save the world is put to the test. Committed to the path, Nathan (Adrian Pasdar) takes some surprising steps to guarantee his election. Jessica (Ali Larter) and D.L. (Leonard Roberts) begin to learn how their family fits into Linderman's plans. Thompson (guest star Eric Roberts, "Less Than Perfect") brings someone new into his company's fold. With more and more blood on his hands, Sylar (guest star Zachary Quinto) visits his mom (guest star Ellen Greene).

When the clock turns back four months for all of the Heroes, Nathan pays a terrible cost for his heroic actions. While Peter survives his detonation over New York City, the Company bags him as a threat to the world, eventually leading to violent confrontation with Elle (Kristen Bell) and the Haitian (Jimmy Jean-Louis). D.L. (Leonard Roberts) makes the ultimate sacrifice for Niki (Ali Larter) and Micah (Noah Gray-Cabey). Maya (Dania Ramirez) horrifically manifests her dark powers for the first time, driving her and Alejandro (Shalim Ortiz) to America for help. A mysterious, yet familiar face is introduced. David Anders, Jack Coleman, Dana Davis, Greg Grunberg, James Kyson Lee, Zachary Quinto, Sendhil Ramamurthy also star. Carlon Jeffery, Nichelle Nichols and Stephen Tobolowsky guest star.

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.

With their new paths becoming clearer, some "Heroes" family relationships are driven apart -- George Takei, Christopher Eccleston, and Jessalyn Gilsig guest star -- Hiro (Golden Globe nominee Masi Oka) struggles to make his father (guest star George Takei), a corporate tycoon, and ambitious sister (guest star Saemi Nakamura) understand his new heroic path in life. Niki (Ali Larter) has a chance to be with D.L (Leonard Roberts) and Micah (Noah Gray-Cabey) again, but will she really be with them? Claude (guest star Chris Eccleston) attempts to teach Peter (Milo Ventimiglia) to harness his abilities, but the process could shatter Peter's faith in those closest to him. Determined to find her birth mother (guest star Jessalyn Gilsig), Claire (Hayden Panettiere) makes her way to a trailer park in Texas. Meanwhile, Sylar (guest star Zachary Quinto) makes a shocking move against H.R.G. (Jack Coleman) -- and his family.

Ali Larter on her dark and violent nature.

Ali Larter is all about being home for the holidays.

Ali Larter on her dark and violent nature.

Ali Larter on her dark and violent nature.

Ali Larter is all about being home for the holidays.