Jess Franco's version of the Bram Stoker classic has Count Dracula as an old man who grows younger whenever he dines on the blood of young maidens.
Hercules is summoned to oppose the evil Queen Samara, who has allied herself with aliens and is sacrificing her own people in a bid to awaken a moon goddess.
After his son is kidnapped, a millionaire industrialist seeks revenge, in spite of the potential danger that his rash actions will bring about for his child and another kidnapped boy, the son of a poor mechanic.
