S2, E7: When one of his forgotten abilities suddenly manifests, Peter (Milo Ventimiglia) and Caitlin (Katie Carr) get thrown into a crisis situation, and learn first-hand just how deadly the mysterious virus striking people with abilities can be. Suresh (Sendhil Ramamurthy), Matt (Greg Grunberg), Nathan (Adrian Pasdar), Niki (Ali Larter) and Bob (guest star Stephen Tobolowsky) band together to fend off the "nightmare man’s" attack. Despite Claire’s (Hayden Panettiere) best efforts to keep them apart, West (Nicholas D’Agosto) learns that the man who kidnapped him as a child is her father (Jack Coleman). Meanwhile, in feudal Japan, Hiro (Masi Oka) and Kensei’s (David Anders) legendary journey takes a dramatic, final turn. Kristen Bell, Noah Gray-Cabey, Dana Davis, James Kyson Lee, Zachary Quinto and Dania Ramirez also star. Alan Blumenfeld, Jimmy Jean-Louis, Shalim Ortiz, Eriko Tamura and Adair Tishler guest star.