Matt enlists unlikely help as the attacks on people with abilities continue; Claire's efforts to hide her healing power at her new high-school are in danger; as part of his new job, Suresh must track down the Haitian.
Upon his return to New York, Suresh finds a previously undiscovered painting that foretells the death of someone close to him; Claire and H.R.G. pursue their own agendas; Maya uses her deadly abilities to free Alejandro from a Mexican prison.
In Ireland, a lost hero discovers that a mysterious woman (Kristen Bell) is willing to kill to find him; Matt and an unexpected ally fly to Philadelphia to hunt down the "boogeyman"; Monica tries to come to terms with her new abilities.
Peter tries to destroy the virus he believes will kill most of the world's population; Niki has bad news for Micah; Hiro goes after his father's killer; Matt uses his abilities to track down the last person in the Company photo.
A sudden manifestation of one of Peter's forgotten abilities throws him and Caitlin into a crisis situation; heroes band together to fend off the "nightmare man"; West learns who kidnapped him as a child; Hiro's journey takes a dramatic turn.