El Santo gets drawn into the action by his girlfriend Lina Cristaldi. The Cristaldis (Lina, the Professor, his daughter Laura, and her young daughter, Rosita) turn out to be the last descendants of a wizard who killed Dracula and the Wolf Man 400 years ago. Revived in modern Mexico (by a hunchback, no less!), the two monsters plot their revenge, planning to kill, seduce, and/or convert the last Cristaldis. Fortunately, the undead prove, as usual, to be vulnerable to wrestling moves.