A gang of bikers embarks on a rampage of destruction that leads the group to an abandoned monastery, where they attack a Satanic cult in the middle of a ritual. The Devil worshippers respond by cursing one of the gang, and she undergoes a horrific transformation. Horror, starring Steve Oliver and Donna Anders.

A biker gang visits a monastery where they encounter black-robed monks engaged in worshipping Satan. When the monks try to persuade one of the female bikers, Helen, to become a satanic sacrifice the bikers smash up the monastery and leave. The monks have the last laugh, though, as Helen, as a result of the satanic rituals, is now possessed and at night changes into a werewolf, with dire results for the biker gang.