Estella Blain as Nadja / Miss Muerte

Mabel Karr as Irma Zimmer

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

Lucía Prado as Barbara Albert

Jesús Franco as Inspector Tanner

Daniel White as Inspector Green

Ángela Tamayo as Juliana

Alberto Bourbón as Policeman

Francisco Camoiras as Fisherman (uncredited)

Mer Casas as Mrs. Moroni (uncredited)

Rafael Hernández as Assistant to Inspector Green (uncredited)

José María Prada as Policeman (uncredited)

Javier de Rivera as Notary (uncredited)

Vicente Roca as Police Doctor (uncredited)