Mary Elizabeth, a 21-year-old virgin, wakes up pregnant after going to bed alone one night. She becomes possessed by the demon fetus growing within her womb, and its dark transformation takes control of her homicidal cravings. As she obeys her unborn spawn's deadly evil cravings, Mary Elizabeth kills six people. Her transformation is controlled by the demon child's cravings, with Dr. Sammael (Joan Severance) possibly trying to intervene.