A young woman named Angela (Melba Moore) is cleaning out the home of her grandmother who died after 30 years as a recluse. Angela's husband, Jack (Frankie Faison), doesn't pay much attention to her. In the basement of the house, Angela discovers a grotesque vegetable—a mandrake root—with her grandmother's ring on it. She pricks her finger on the plant while removing the ring, and discovers the next day that the root has turned into a tall, handsome, muscular, sexually irresistible man (Byron Minns). But the mandrake needs a steady supply of blood, and Angela not only learns what happened to her grandfather but also the horrible secret of the mandrake.