Puerto Rican Fernando Cortés belonged to a family of popular show business artists, including his wife Mapy Cortés and niece Mapita Cortés (who had a starring role in Fernando Méndez's "Misterios de ultratumba"). Cortés made his first attempt at horror (although in a comedy note) while directing Tin Tan in the funny "The Phantom of the Operetta", and then made this only straight horror movie. The plot concerns a mad scientist who was executed for the crimes he committed while trying to achieve immortality: he is brought back to life by a descendant, but the resurrected man has not learnt his lesson and goes back to his evil deeds. "La marca del muerto" is not as bad as some persons believe, thinking that those ugly re-edited and dubbed versions of foreign motion pictures, perpetrated by the likes of Jerry Warren or K. Gordon Murray, are the real deal. Well, no. For fans of the genre, this is worth a look.