The film involves Casimiro (Tin-Tan), a night watchman in a Wax Museum, whose boss, Professor Sebastian (Yerye Beirute), has been secretly draining his blood to use in his experiments in resurrection.

[3] Casimiro (Tin Tan), the night watchman at a wax museum of horrors, has been napping more frequently on the job because his boss, Professor Sebastian (Yerye Beirute),[3] is secretly draining blood from him while he sleeps to use in his experiments in resurrection, experiments conducted in his hidden laboratory behind the wax museum.

After the doctor and his men leave the lab that night, a bolt of lightning reactivates the equipment and provides the surge needed to revive the dead man.

As he struggles to awareness, the clouds outside part, the full moon shines on his face through a window, and the resurrected corpse transforms into a werewolf.

[3] When the professor and his men return, the werewolf kills one of his henchmen, and the Wolf Man is imprisoned in a cage inside the lab.

"[4] The werewolf transformation effects in the film were very similar to those in the Universal Wolf Man movies, with Chaney having to hold his face still while the slow dissolves turn him into a monster.