After a preemptive strike against Hiro and Ando in Africa, Arthur Petrelli orders Knox and Flint to hunt down his son Peter and granddaughter Claire. Nathan is stunned to learn his father is alive -- and leading a villainous charge to worldwide destruction. Meanwhile, back at Pinehearst, Sylar has a charged confrontation with Elle. Suresh begins testing his new, combined superpower formula. Later, with the others dead, injured or on the run, Matt attempts to wake Angela.

The eclipse continues to impact the Heroes' abilities as Elle and Sylar face off against a vengeful H.R.G. while Claire struggles to survive. In Haiti, Peter and Nathan join forces with the Haitian to battle the Haitian's brother, Baron Samedi, and Nathan comes to a shocking decision. In the meantime, Ando, Sam and Frack work hard to get Hiro's memory back with the help of the "9th Wonders" comic books at a local comic bookstore.