Mabel Karr as Irma Zimmer

Estella Blain as Nadja / Miss Muerte

Fernando Montes as Dr. Phillippe Brighthouse

Howard Vernon as Dr. Vicas

Guy Mairesse as Hans Bergen

Antonio Jiménez Escribano as Dr. Zimmer

Marcelo Arroita-Jáuregui as Dr. Moroni

Cris Huerta as Dr. Kallman

Jesús Franco as Inspector Tanner

Daniel White as Inspector Green

Alberto Bourbón as Policeman

Francisco Camoiras as Fisherman (uncredited)

Mer Casas as Mrs. Moroni (uncredited)

Ana Castor as Juliana (uncredited)

Rafael Hernández as Assistant to Inspector Green (uncredited)

José María Prada as Policeman (uncredited)

Lucía Prado as Barbara Albert (uncredited)

Javier de Rivera as Notary (uncredited)

Vicente Roca as Police Doctor (uncredited)

Ángela Tamayo as Girl at the Nightclub (uncredited)