Teenage Exorcist

Diane (Brinke Stevens), a prim and proper grad student, rents a spooky old house from a creepy realtor, only to be possessed by an ancient demon who transforms her into a leather-clad, chainsaw-wielding succubus. Her sister Sally, brother-in-law Mike, and boyfriend Jeff are attacked by Diane's demonic incarnation, prompting them to summon a priest, Father McFerrin, played by Robert Quarry, to handle the situation. When that fails, it's up to Eddie Deezen, playing a pizza delivery boy who arrives at the house and must help stop the demon along with the rest of the gang.