Harry Perry

Grissom and Sara investigate the murder of a mental-hospital patient and quickly narrow down the suspects to a handful of other patients and staff members.

In the climactic season finale, everyone bands together in an effort to stop Samuel (Robert Knepper) from taking the lives of thousands. Peter (Milo Ventimiglia) joins forces with his most unexpected ally to save Emma (guest star Deanne Bray). Meanwhile, H.R.G.’s (Jack Coleman) life hangs in the balance as he and Claire (Hayden Panettiere) find themselves trapped underground with oxygen quickly running out. Elsewhere, Hiro (Masi Oka) starts to come to grips with the decisions he has made and is called into action to help stop a disaster. Greg Grunberg, Ali Larter, Zachary Quinto and James Kyson Lee also star. David H. Lawrence XVII, Harry Perry, Todd Stashwick also guest star.

Under Samuel’s (Robert Knepper) guidance, Sylar (Zachary Quinto) starts on a path to rediscover his true identity. Hiro (Masi Oka) helps Emma (guest star Deanne Bray) accept and understand the great possibilities that go along with having an ability. Meanwhile, Peter (Milo Ventimiglia) enlists HRG (Jack Coleman) to help him find a healer who can save Hiro’s life. Hayden Panettiere also stars. Mark L. Young also guest stars.

H.R.G. (Jack Coleman) hosts an untraditional Thanksgiving dinner. Elsewhere, the Petrelli family gets a surprise guest at their table. Meanwhile, Samuel (Robert Knepper) continues to hold Hiro (Masi Oka) hostage, as Lydia (guest star Dawn Olivieri) goes in search of the truth. Greg Grunberg, Hayden Panettiere, Adrian Pasdar, Zachary Quinto, Sendhil Ramamurthy, Cristine Rose and Milo Ventimiglia also star. Ashley Crow, Jimmy Jean-Louis, Madeline Zima, Ray Park, Harry Perry, Elisabeth Rohm, Andrew Connolly also guest star.

Fueled by his vision of Emma (guest star Deanne Bray) in grave danger, Peter (Milo Ventimiglia) attempts to rescue Sylar (Zachary Quinto) from his worst nightmare. At the carnival, Samuel (Robert Knepper) reveals H.R.G.’s (Jack Coleman) secret past in order to bring Claire (Hayden Panettiere) to his side. Meanwhile, Lauren (guest star Elisabeth Rohm) makes a bold move to put a stop to Samuel. Sendhil Ramamurthy also stars. Ashley Crow, Jimmy Jean-Louis, Harry Perry, Todd Stashwick also guest star.