El Santo, the masked Mexican wrestler, investigates a series of kidnappings. He discovers that the mysterious Doctor Caroll is using the victims as part of his experiments to develop an army of monsters. Naturally, El Santo is able to overcome them all - with wrestling!
| Writing | Fernando Galiana | Story |
| Directing | Alfonso Corona Blake | Director |
| Directing | Manuel San Fernando | Director |
| Writing | Alfonso Corona Blake | Screenplay |
| Writing | Julio Porter | Story |
| Production | Alberto López | Producer |
| Crew | José Ortiz Ramos | Cinematography |
| Editing | José W. Bustos | Editor |
| Art | José Rodríguez Granada | Production Design |
| Art | Eduardo Carrasco | Set Decoration |
| Costume & Make-Up | Román Juárez | Makeup Artist |
