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.
El Santo
Santo
Gaspar Henaine
Capulina
Liza Castro
Crox Alvarado
Chief of Police
Carlos Agostí
Cedric
Miguel Gómez Checa
Scientist
Nathanael León
Henchman (as Frankenstein)
Mario García 'Harapos'
