After a preemptive strike against Hiro (Masi Oka) and Ando (James Kyson Lee) in Africa, Arthur Petrelli (guest star Robert Forster) orders Knox (guest star Jamie Hector) and Flint (Blake Shields) to hunt down his son Peter (Milo Ventimiglia) and granddaughter Claire.

Previously in "Volume 1: Genesis" and "Volume 2: Generations," when a total eclipse cast its shadow across the globe, a multitude of everyday men and women with special powers seemingly were called forth. To prevent grim predictions of the future, a handful of these individuals banded together to save the cheerleader, New York City, and the world. Now, as ominous, new signs signal catastrophe ahead, new and familiar adversaries begin to gather...