Mario Bava Director, Screenwriter, Cinematographer Boris Karloff Himself, Gorca Actor Jacqueline Pierreux Helen Chester Actor Michèle Mercier Rosy Actor Lydia Alfonsi Mary Actor Mark Damon Vladimire d'Urfe Actor Susy Andersen Sdenka Actor Massimo Righi Pietro Actor Rika Dialyna Maria Actor Alberto Bevilacqua Screenwriter Marcello Fondato Screenwriter Salvatore Billitteri Producer Paolo Mercuri Producer Les Baxter Original Music Roberto Nicolosi Original Music Ubaldo Terzano Cinematographer Mario Serandrei Film Editing Riccardo Domenici Production Design Giorgio Giovannini Art Director Tina Grani Costume Design