Hugo Blanco ( Hugo Blanco )

Andros

Agnès Spaak ( Agnès Spaak )

Melissa

Perla Cristal ( Perla Cristal )

Rosa

Magda Maldonado ( Magda Maldonado )

Amira (as Magda MacDonald)

Marcelo Arroita-Jáuregui ( Marcelo Arroita-Jáuregui )

Dr. Conrad Jekyll

Pepe Rubio ( Pepe Rubio )

Juan Manuel

Pastor Serrador ( Pastor Serrador )

Inspector Klein

Luisa Sala ( Luisa Sala )

Inglud Jekyll / Ingrid Fisherman

Manuel Guitián ( Manuel Guitián )

Ciceron

Ramón Lillo ( Ramón Lillo )

Emilio, the inspector's assistant

Jesús Franco ( Jesús Franco )

Piano Player

Marta Reves ( Marta Reves )

Daniel Blumer ( Daniel Blumer )

Karl Steiner

Mer Casas ( Mer Casas )

Conrad's Girlfriend

Rafael Hernández ( Rafael Hernández )

Club Owner

José Truchado ( José Truchado )

Policeman

Juan Antonio Soler ( Juan Antonio Soler )

Witness

Javier de Rivera ( Javier de Rivera )

The Professor

Julio Infiesta ( Julio Infiesta )

Club Security

Julia Toboso ( Julia Toboso )

Maribel Hidalgo ( Maribel Hidalgo )

Pedro Fenollar ( Pedro Fenollar )

Lang (uncredited)