A married couple accept the invitation of mysterious vixen Diane LeFanu to visit her in her secluded desert estate. Tensions arise when the couple, unaware at first that Diane is a centuries-old vampire, realize that they are both objects of the pale temptress' seductions.

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.

Angel (William Smith), an outlaw biker, sells out his gang by exposing their wild conquests to Like magazine for $10,000. With his photo on the cover, Angel skips town and tries to start over with help from sheep rancher Dan Felton (Dan Kemp). An ex-motorcycle enthusiast, Dan becomes a mentor to Angel, giving him hope for a peaceful future. But Angel must put hope aside when members of his former gang viciously attack Dan's teenage daughter.