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Everyone bands together to try to stop Samuel from taking the lives of thousands.

As Noah's life hangs in the balance, Samuel prepares to kill thousands and Peter and the others must band together to stop him and save Emma.

While Peter tries to save Sylar based on his precognitive vision of Emma, Lauren goes after Samuel.

The new and different Sylar pays Matt a visit, while Peter tries to warn Emma that Samuel isn't what he seems. Meanwhile, Noah begins his plan to infiltrate the carnival and capture Samuel.

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.

While Hiro and Ando attempt to save Suresh, Bennet tries to expose Samuel's weakness in his attempt to defeat the carnival leader.

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 gets some unexpected visitors, while Claire arrives at the carnival as Samuel's plans progress. Elsewhere, Peter confronts Sylar and discovers that extreme measures are necessary to stop him.

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.

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.

Claire investigates the sorority attacks, which may have a link to Noah. Elsewhere, Peter finds his job performance improved after gaining a new ability, which also provides a means to help Emma, and Sylar continues his assault on Matt.

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

Sylar continues to torment Matt. HRG and Tracy help a young boy who is has suffered many hardships in his life. Claire and Gretchen have a problem with their new sorority sisters hazing them.

Sylar starts to find his true identity. Peter and HRG go on a quest to find someone that can save Hiro.

When worlds collide: Sylar digs himself out of the dirt, alerting Samuel to his impending arrival. Ernie Hudson guest stars.

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.

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.

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 as far 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.