El secreto del Dr. Orloff

Hugo Blanco

Andros

Agnès Spaak

Melissa

Perla Cristal

Rosa

Magda Maldonado

Amira (as Magda MacDonald)

Marcelo Arroita-Jáuregui

Dr. Conrad Jekyll

Pepe Rubio

Juan Manuel

Pastor Serrador

Inspector Klein

Luisa Sala

Inglud Jekyll / Ingrid Fisherman

Manuel Guitián

Ciceron

Ramón Lillo

Emilio, the inspector's assistant

Jesús Franco

Piano Player

Marta Reves

Daniel Blumer

Karl Steiner

Mer Casas

Conrad's Girlfriend

Rafael Hernández

Club Owner

José Truchado

Policeman

Juan Antonio Soler

Witness

Javier de Rivera

The Professor

Julio Infiesta

Club Security

Julia Toboso

Maribel Hidalgo

Pedro Fenollar

Lang (uncredited)