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

Waldemar Daninsky (voice) (uncredited)