In a quest to thwart Arthur's plans, Hiro and Claire band together to travel back in time 16 years to when Kaito gave baby Claire to H.R.G. Meanwhile, Peter and the Haitian join forces to finish off Arthur Petrelli for good -- but Sylar has other plans for them. Elsewhere, in the lab, Suresh makes a major breakthrough with the formula that could change everything.
Guest Stars: Robert Forster, George Takei, Seth Green, Breckin Meyer, Kristin Bell, Jimmy Jean-Louis, Brea Grant, Jamie Hector, and Blake Shields, Jessalyn Gilsig, Ashley Crow, Tamlyn Tomita and Chad Faust
Show Cast: Adrian Pasdar, Milo Ventimiglia, Ali Larter, Hayden Panettiere, Greg Grunberg, Sendhil Ramamurthy, Masi Oka, Adrian Pasdar, Jack Coleman, James Kyson Lee, Dania Ramirez, Zachary Quinto, Cristine Rose.
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