Calpuina is a night-watchman in a wharehouse, a perfect job for him. When some thieves break in and steal some crates, El Santo is after them because they are using the wharehouse for diamond smuggling. Capulina hinders their capture. Then he decides that he will put on a wrestler's mask and help El Santo to caputre the crooks.
| Directing | René Cardona | Director |
| Writing | Alfredo Zacarías | Writer |
| Production | Alfredo Zacarías | Producer |
| Writing | Alfredo Zacarías | Screenplay |
| Sound | Manuel Esperón | Music |
| Crew | León Sánchez | Cinematography |
| Editing | Eufemio Rivera | Editor |
| Editing | Gloria Schoemann | Editor |
