A priest, trying to regain his standing in the church after "falling" and sleeping with a woman, teams with a group of ESP experts to investigate a haunted house. It doesn't help that one of the experts is a beautiful young woman.

Diane is a repressed, neurotic grad student, who moves into a cursed mansion only to be possessed by the house's demonic master. She is then transformed into a raven-haired, leather and lingerie-clad seductress, who seeks a virgin sacrifice for her master. Meanwhile her sister, brother-in-law, a priest, and a pizza boy try to rescue her while avoiding the demon's wrath.

Someone is killing off the female leads of the movie production "Bad Girls from Mars." The producers feel they should try to finish the film, even though they're making a lucrative amount from insurance payoffs, so they fly in European sex bomb Emanuelle as the new lead. Emanuelle immediately begins embarrassing the producers by leading a wild party life around town. Meanwhile the killings continue, and detectives try to stop the fiend responsible.