Paul Naschy

Hector Doriani / Alex Doriani / Frankenstein's Monster / Mr. Hyde / Phantom of the Opera / Waldemar Daninsky the Werewolf / Quasimodo / The Devil

Caroline Munro

Carmen

Howard Vernon

Eric

Fernando Hilbeck

Father Damián

Mariano Vidal Molina

Civil Guard

Mabel Ordóñez

Lola

Isabel Prinz

Lorena

Sergio Molina

Adrián (as Serge Mills)

Cris Huerta

Zacarías

Malena Gracia

Woman (uncredited)