Sometime in the Middle Ages. The young duke Eduardo, heir to the throne, is cursed. Every night he changes into a horrible looking monster. An alchemist, killed by Eduardos father, is responsible for this curse. Only a woman who loves Eduardo can overcome it. But Eduardos fiance Althea suffers a shock when she sees him as the monster. Eduardos brother, Prince Bruno, who has also ambitions to follow his father on the throne, stirs up the villagers to kill Eduardo. Then, one night, the mob catches Eduardo...