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.

Recently orphaned teenagers David and Lynn are sent to California to live with their grandparents who they discover are harboring a terrifying secret.

Three socially awkward sorority girls invite three fraternity pledges over for a night of fun, but when the group holds a séance, the girls find themselves possessed by a shaman who transforms them into lustful, uninhibited succubi.