Jason Graham

The hospital is hit with an unprecedented crisis; Meredith and Cristina's surgical skills are put to the test.

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.

When pirates take over a luxury yacht, Delko's future as a CSI is threatened just as his relationship with Calleigh moves to the next level.

Sebastian prosecutes the glitzy case of a Hollywood starlet who is killed after a night of clubbing when her car is run off the road.