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.

Brinke Stevens
as Dianne

Eddie Deezen
as Eddie

Oliver Darrow
as Demon

John Henry Richardson
as Mike

Tom Shell
as Jeff

Elena Sahagun
as Sally

Robert Quarry
as Father McFerrin

Michael Berryman
as Herman

Hoke Howell
as Baron DeSade

Kathryn Kates
as Maid