S3, E12: Our Father
Hoping to find a way to stop Arthur (guest star Robert Forster), Hiro (Masi Oka) and Claire (Hayden Panettiere) band together and travel back in time 16 years to when Kaito (guest star George Takei) gave baby Claire to H.R.G. (Jack Coleman). Meanwhile, Peter (Milo Ventimiglia) and the Haitian (guest star Jimmy Jean-Louis) team up to finish off Arthur Petrelli for good but are interrupted by Sylar (Zachary Quinto). Elsewhere, in the lab, Suresh (Sendhil Ramamurthy) has a major breakthrough with the formula that will likely change everything. Ali Larter, Cristine Rose, Greg Grunberg, Adrian Pasdar and James Kyson Lee also star. Jessalyn Gilsig, Ashley Crow, Tamlyn Tomita and Chad Faust also guest star.