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)
Adolfo Thous
(as Adolfo Tohus)
Simón Ramírez
Waldemar Daninsky (voice) (uncredited)