Hugo Blanco as Andros

Agnès Spaak as Melissa

Perla Cristal as Rosa

Magda Maldonado as Amira (as Magda MacDonald)

Marcelo Arroita-Jáuregui as Dr. Conrad Jekyll

Pepe Rubio as Juan Manuel

Pastor Serrador as Inspector Klein

Luisa Sala as Inglud Jekyll / Ingrid Fisherman

Manuel Guitián as Ciceron

Ramón Lillo as Emilio, the inspector's assistant

Jesús Franco as Piano Player

Marta Reves as

Daniel Blumer as Karl Steiner

Mer Casas as Conrad's Girlfriend

Rafael Hernández as Club Owner

José Truchado as Policeman

Juan Antonio Soler as Witness

Javier de Rivera as The Professor

Julio Infiesta as Club Security

Julia Toboso as

Maribel Hidalgo as

Pedro Fenollar as Lang (uncredited)