Now knowing what's at stake if they fail in their mission, Hiro (Golden Globe nominee Masi Oka) and Ando's (James Kyson Lee) determination to save the world is put to the test. Committed to the path, Nathan (Adrian Pasdar) takes some surprising steps to guarantee his election. Jessica (Ali Larter) and D.L. (Leonard Roberts) begin to learn how their family fits into Linderman's plans. Thompson (guest star Eric Roberts, "Less Than Perfect") brings someone new into his company's fold. With more and more blood on his hands, Sylar (guest star Zachary Quinto) visits his mom (guest star Ellen Greene). Santiago Cabrera, Jack Coleman, Noah Gray-Cabey, Greg Grunberg, Hayden Panettiere, Sendhil Ramamurthy and Milo Ventimiglia also star. Matthew John Armstrong, Justin Evans, Missy Peregrym, Cristine Rose, Rena Sofer ("24"), Adair Tishler, and Jackson Wurth guest-star.