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!
El Santo
as Santo, el Enmascarado de Plata
Norma Mora
as Susana Mendoza
Rubén Rojo
as Ricardo Carbajal
Roxana Bellini
as Gloria Mendoza
Claudio Brook
as Dr. Karol
José Luis Jiménez
as Professor Galvan
Víctor Velázquez
as Inspector Fernandez
Jorge Mondragón
as Police Chief
Fernando Osés
as Henchman
Nathanael León
as Henchman
Concepción Martínez
as Anciana encuentra cámara
Myron Levine
as Doctor
