From Heroes Wiki
Perrin Crocker was an evolved human capable of producing bone spikes from his body, who was convicted of murdering his wife.
Perrin sits in a prison transport bus, waiting to be locked up in jail. Another prisoner, Steve Gustavson, begins to talk with him. He first threatens him, and then taunts him about murdering his wife. Angered, Perrin uses his ability. Spikes rip outward from his body, impaling other prisoners, and ripping through the hull of the bus. The bus then falls from the road and crashes.
Donald Essex relives the moment when Perrin used his ability inside the bus.
Perrin Crocker is able to protrude bone spikes from his body.