By 1960 the films starring both Germán Valdés "Tin Tan" and Lon Chaney, Jr. were far from their better work. Valdés, a very good comedian, singer and dancer, had reached his peak during the late 1940s with comedies as "Calabacitas tiernas" and "El rey del barrio", both directed by Gilberto Martínez Solares. Chaney, as all the fans of fantastic cinema know, had been one of the stars of Universal classic horror films, and had proved his dramatic skills in "Of Mice and Men" and "High Noon." Reunited, they try to inject a bit of life to this vehicle but the results are rather below average. Playing a watchman who is constantly drowsy, an aging Tin Tan spends most of the projection time dozing; and Chaney (with evident signs of illness and the effects of alcohol abuse, at 54) tiredly reprises the acrobatics of the werewolf, and fills the gaps evoking the torment of Lawrence Talbot. He first appears as the ancient mummy of a ruthless Egyptian ruler who was cursed by one of his victims, and turned into a werewolf whenever the moon was full. The mummy is stolen by a mad scientist who fronts his experiments to bring the dead back to life, with the wax museum where Casimiro (Tin Tan) snoozes. Then the film turns into a rehash of "Abbott and Costello Meet Frankenstein", while Paquita, the female lead (Yolanda Varela, who spends the whole movie literally working, as a waitress and a receptionist), the scientist and his two assistants almost play it straight. There is a feeble attempt at absurd comedy, with the character of a crazy psychologist (in whose clinic Casimiro and Paquita work in the afternoons) and one of his patients, played by Oscar Ortiz de Pinedo and Consuelo Guerrero de Luna as a stuttering patient (a part that strangely was not given to Vitola, a regular in the Tin Tan/Martínez Solares comedies.) Presumably Fernando Méndez (director of the classic "Ladrón de cadáveres", "El vampiro" and "Misterios de ultratumba") contributed to the script of the film, produced by his son. But there is nothing new here: as have been said, a bit of "King Kong", and a bit of "Safety Last" in the last reel, when one might be as sleepy as Casimiro.