The calendar turns back four months, and Nathan must pay a terrible price for his heroic deeds; D.L. sacrifices for Nikki and Micah; Maya manifests her dark powers for the first time.
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.
H.R.G. prepares the family to run, believing the Company is hot on its trail; Hiro returns to the present and learns of his father's death; Suresh makes a decision that could change lives.