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.