Σε Φόντο Κόκκινο

Paul Naschy

— Waldemar Daninsky / Wolfman / Mr. Hyde

Shirley Corrigan

— Justine

Jack Taylor

— Dr. Henry Jekyll

Mirta Miller

— Sandra

José Marco

— Imre Kosta

Luis Induni

— Otvos

Barta Barri

— Gyogyo, the inn-keeper

Luis Gaspar

— Thurko, Otvos's thug

Elsa Zabala

— Uswika Bathory

Lucy Tiller

— Whore

Montserrat Julió

— Agatha (uncredited)

Marisol Delgado

— Nurse / Victim (uncredited)

María Luisa Tovar

— Streetwalker / Victim (uncredited)

Heinrich Starhemberg

— Party Guest (uncredited)

Jorge Vico

Adolfo Thous

— (as Adolfo Tohus)

Simón Ramírez Fernández

— Waldemar Daninsky (voice) (uncredited)