Capulina is a night-watchman in a warehouse, a perfect job for him. When some thieves break in and steal some crates, El Santo is after them because they are using the warehouse for diamond smuggling. Capulina hinders their capture. He then decides that he will put on a wrestler's mask and help El Santo to caputre the crooks.
Directed by René Cardona
El Santo
Santo
Gaspar Henaine
Capulina
Liza Castro
Scientist's Daughter
Crox Alvarado
Chief of Police
Carlos Agostí
Cedric
Miguel Gómez Checa
Scientist
Nathanael León
Henchman
Mario García 'Harapos'
