S3, E9: 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. Nathan (Adrian Pasdar) is stunned to learn his father is alive -- and leading a villainous charge to worldwide destruction. Meanwhile, back at Pinehearst, Sylar (Zachary Quinto) has a charged confrontation with Elle (guest star Kristen Bell). Suresh (Sendhil Ramamurthy) begins testing his new, combined superpower formula. Later, with the others dead, injured or on the run, Matt (Greg Grunberg) attempts to wake Angela (Cristine Rose). Jack Coleman and Ali Larter star. Robert Forster, Brea Grant and Ntare Guma Mbaho Mwine also guest star.