S3, E25: Nathan (Adrian Pasdar) faces off against Sylar (Zachary Quinto) to keep him from meeting the President (guest star Michael Dorn). Sylar has his own plans for his new partner. Meanwhile, Hiro (Masi Oka) learns that there are repercussions to regaining his ability. Elsewhere, Matt (Greg Grunberg) is forced to go to extraordinary lengths to protect his future with his family. Jack Coleman, James Kyson Lee, Hayden Panettiere, Sendhil Ramamurthy, Cristine Rose and Milo Ventimiglia also star.