A mysterious killer has been strangling women in a variety theater, and the police decide to bring Santo into the investigation. Santo suspects the killer is hiding undercover as one of the theater employees and must discover his true identity before more women are murdered.
El Santo
María Duval
Roberto Cañedo
Ofelia Montesco
Carlos López Moctezuma
Begoña Palacios
Alberto Vázquez
Eric del Castillo
Emma Arvizu
Julián de Meriche
Nathanael León
Fernando Osés
Milton Ray
Mayte Carol
Gloria Chávez
Julio Ahuet
Manuel Dondé
José Cora
Guillermo Bravo Sosa
Salvador Terroba
José Alcalde
Abel Cureño
Beny Galán
Antonio «Pícoro» Padilla
Edaena Ruiz
Gerardo Zepeda