Heroes

Claire (Hayden Panettiere) struggles with adjusting to her new life in college when a mysterious death thrusts her into the spotlight once again. Elsewhere, Hiro (Masi Oka) and Ando (James Kyson Lee) continue their noble quest to help people by promoting their abilities. Angela (Cristine Rose) fears Nathan (Adrian Pasdar) will soon discover his true identity; while Matt (Greg Grunberg) is haunted by an unexpected visitor seeking something he has lost. Tracy Strauss (Ali Larter) and H.R.G. (Jack Coleman) join forces, looking for the key to unlock the motive behind a horrific crime. Meanwhile, Peter (Milo Ventimiglia) uses his abilities for good, but he is soon called upon to aid an old friend. While the heroes adjust to their new surroundings, a mysterious carnival clan, led by ringleader Samuel (Robert Knepper), sets their sights on familiar faces. James Kyson Lee and Zachary Quinto also star. Rachel Melvin, Jimmy Jean-Louis, Ashley Crow, Lisa Lackey, Assaf Cohen, and Saemi Nakamura also guest star.

Peter (Milo Ventimiglia) faces unexpected consequences for his heroic acts and encounters a reluctant new hero (guest star Deanne Bray). As Claire (Hayden Panettiere) continues to adjust to college life, she must figure out how to deal with her ability having been revealed. Meanwhile, Samuel (Robert Knepper) moves heaven and earth to recapture the memories of his late brother Joseph. Elsewhere, Matt (Greg Grunberg) struggles with his internal demons as Sylar (Zachary Quinto) mysteriously resurfaces. Jack Coleman also stars. Assaf Cohen and Rick Worthy also guest star.

As Hiro's (Masi Oka) life continues to hang in the balance, he distracts himself with saving the lives of others. Meanwhile, Angela (Cristine Rose) tries to help the new "Nathan" (Adrian Pasdar) remember his past, at the risk of his remembering too much. Elsewhere, Tracy (Ali Larter) is determined to get her old job back, but soon realizes that she needs to make more of an impact. Jack Coleman, James Kyson Lee, Zachary Quinto and Milo Ventimiglia also star. Ashley Crow, Saemi Nakamura and Dawn Olivieri also guest star.

Samuel (Robert Knepper) prepares for new additions to his family, while Lydia (guest star Dawn Olivieri) warns him of the consequences. Claire (Hayden Panettiere) discovers that her roommate Gretchen (guest star Madeline Zima) may have a hidden agenda. Meanwhile, Peter (Milo Ventimiglia) finds an unexpected way to connect with Emma (guest star Deanne Bray), who would prefer to stay distant. Elsewhere, a different side of Sylar (Zachary Quinto) emerges as he desperately tries to remember the person he used to be. Masi Oka and Cristine Rose also star. Rachel Melvin and Jack Wallace 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.

Matt (Greg Grunberg) goes to extreme measures to extinguish Sylar (Zachary Quinto), who continues to torment him. Elsewhere, H.R.G. (Jack Coleman) calls in a favor from Tracy (Ali Larter) to save a troubled young boy whose misfortunes resemble her own. While Claire (Hayden Panettiere) and Gretchen (guest star Madeline Zima) are being hazed by their new sorority sisters, they realize pledging might not be their biggest problem. Robert Knepper also stars. Lisa Lackey, Tessa Thompson and Rick Worthy guest star.

When Hiro (Masi Oka) travels three years into the past, he has a second chance to save Charlie (guest star Jayma Mays) from the hands of Sylar (Zachary Quinto). However, Samuel's (Robert Knepper) presence serves to complicate Hiro's mission even further. Elsewhere, H.R.G.'s (Jack Coleman) past with his Primatech partner (guest star Elizabeth Rohm) is revealed. James Kyson Lee, Hayden Panettiere and Sendhil Ramamurthy also star. Danielle Savre, Sally Champlin and Dawn Olivieri also guest star.

Claire (Hayden Panettiere) is determined to get to the bottom of the Sorority Rush attacks on her own, until H.R.G. (Jack Coleman) intervenes only to realize he may be the source of her troubles. Meanwhile, Peter's (Milo Ventimiglia) new ability is a perfect fit for his job and gives him the opportunity to help Emma (guest star Deanne Bray) accept her new life. Elsewhere, Sylar's (Zachary Quinto) battle at gaining full control over Matt's (Greg Grunberg) body escalates -- with potentially dangerous implications at stake. Robert Knepper and Adrian Pasdar also star. Kat Purgal, Carlease Burke, Danica Stewart, Candice Patton, Sally Champlin and Assaf Cohen also guest star.

Samuel (Robert Knepper) learns just how powerful he can become and takes dangerous measures to reach his full potential. Meanwhile, as Tracy (Ali Larter) begins to lose control of her ability, one of her own comes in harm's way. Elsewhere, Sylar (Zachary Quinto) continues his battle with Matt (Greg Grunberg). Jack Coleman, Masi Oka, Hayden Panettiere, Adrian Pasdar, Sendhil Ramamurthy, Cristine Rose and Milo Ventimiglia also star. Kavi Ladnier, Jimmy Jean-Louis, Ravi Kapoor and Andrew Connolly guest star.

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.

H.R.G. (Jack Coleman) is greeted by some unexpected visitors and Samuel's (Robert Knepper) grand plan begins to come to fruition. Meanwhile, Peter (Milo Ventimiglia) struggles to accept the truth and takes extreme measures to get what he wants. Elsewhere, Claire's (Hayden Panettiere) journey leads her to an unexpected destination. Adrian Pasdar, Zachary Quinto and Cristine Rose also star. Jimmy Jean-Louis, David H. Lawrence XVII, Madeline Zima, Dawn Olivieri, Todd Stashwick and Elisabeth Rohm guest star.

The search for answers intensifies as final respects are paid to a fallen hero. As Claire (Hayden Panettiere) becomes immersed into the world of the Carnival, she becomes increasingly suspicious of Samuel's (Robert Knepper) motives. Hiro (Masi Oka) is on a mission to rescue one of his own, but has difficulty communicating his intentions to Ando (James Kyson Lee). Samuel has his sight set on Emma (guest star Deanne Bray) and her ability to complete his master plan. Cristine Rose also stars. Todd Stashwick, Saemi Nakamura, and Sasha Pieterse also guest star.

Sylar (Zachary Quinto) returns to the Carnival in search of answers and Peter (Milo Ventimiglia) continues to struggle with the loss of his brother. Elsewhere, H.R.G. (Jack Coleman) sets his plan in motion to take down the carnival. Cristine Rose also stars. David H. Lawrence XVII, Ray Park, Dawn Olivieri, Elisabeth Rohm and Dawn-Lyen Gardner guest star.

H.R.G. (Jack Coleman) recruits Matt (Greg Grunberg) to help him take down Samuel (Robert Knepper), as they use his long-lost love, Vanessa (guest star Kate Vernon), to lure him to them, but Samuel has his own plans for Vanessa in the works. Meanwhile, Hiro (Masi Oka) and Ando (James Kyson Lee) go to extreme lengths to save Dr. Suresh (Sendhil Ramamurthy). Elsewhere, Peter's (Milo Ventimiglia) introduction of Emma (guest star Deanne Bray) to his mother (Cristine Rose) brings forth visions of a very grim future. Hayden Panettiere also stars. Todd Stashwick and Sasha Pieterse also guest star.

Hiro's (Masi Oka) life hangs in the balance as his brain tumor worsens, prompting him to subconsciously deal with some of his past decisions. Meanwhile, Sylar (Zachary Quinto) pays Claire (Hayden Panettiere) an unexpected visit to get answers as to why he isn't quite himself. Elsewhere, Samuel's (Robert Knepper) plan to impress his long-lost love, Vanessa (guest star Kate Vernon), takes a terrifying turn. Jack Coleman, James Kyson Lee and Sendhil Ramamurthy also star. Lisa Lackey, Danielle Savre, Sally Champlin, Satomi Okuno and Jordan Dang also guest star.

H.R.G. (Jack Coleman) enacts his plan to take down the Carnival with the help of Lauren (guest star Elizabeth Rohm) and Suresh (Sendhil Ramamurthy). Sylar (Zachary Quinto) visits Matt (Greg Grunberg) looking to understand his desire to make a human connection, but Matt has a plan of his own. Meanwhile, Peter (Milo Ventimiglia) warns Emma (guest star Deanne Bray) of Samuel's (Robert Knepper) intentions after his grim vision of the future. Hayden Panettiere and Cristine Rose also star. Madeline Zima, Ray Park, Lisa Lackey, David H. Lawrence XVII, Dawn Olivieri, Harry Perry and Todd Stashwick 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.

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.