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 so much 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.

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 so much 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.

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.

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.

Samuel prepares for new additions to his family, while Lydia warns him of the consequences. Claire discovers that her roommate Gretchen may have a hidden agenda. Meanwhile, Peter finds an unexpected way to connect with Emma, who would prefer to stay distant. Elsewhere, a different side of Sylar emerges as he desperately tries to remember the person he used to be.

Under Samuel's guidance, Sylar starts on a path to rediscover his true identity. Hiro helps Emma accept and understand the great possibilities that go along with having an ability. Meanwhile, Peter enlists HRG to help him find a healer who can save Hiro's life.

Matt goes to extreme lengths to get rid of Sylar's mental influence. Noah and Tracy come to Jeremy's aid when the Cainan police hold the boy for the death of his parents. And Claire and Gretchen go on a sorority scavenger hunt only to discover someone is taking it deadly serious.

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

Claire is determined to get to the bottom of the Sorority Rush attacks on her own, until H.R.G. intervenes only to realize he may be the source of her troubles. Meanwhile, Peter’s new ability is a perfect fit for his job and gives him the opportunity to help Emma accept her new life. Elsewhere, Sylar’s battle at gaining full control over Matt’s body escalates --with potentially dangerous implications at stake.

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...

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.

Unexpected visitors greet H.R.G.; Samuel’s plan starts to come to fruition; struggling to accept the truth, Peter takes extreme measures to get what he wants; Claire’s journey leads her to an unexpected destination.

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 recruits Matt in an attempt to find Samuel's one weakness. Ando and Hiro try to rescue Mohinder from the asylum, while Peter discovers Emma's destiny. '

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

H.R.G. enacts his plan to take down the carnival; looking to understand his desire to make a human connection, Sylar visits Matt; Peter warns Emma about Samuel's intentions.

Samuel reveals the secrets of Noah's past to his daughter Claire in an effort to turn her against him. Meanwhile, Peter enters Matt's mindscape to rescue Sylar, but both men must face their inner demons. '

Everyone bands together to try to stop Samuel from taking the lives of thousands; Peter teams with an unexpected ally to save Emma; H.R.G.'s life hangs in the balance; Hiro comes to grips with decisions he has made.