Stephen Forsyth John Harrington Dagmar Lassander Helen Wood Laura Betti Mildred Harrington Jesús Puente Inspector Russell (as Jesus Puente) Femi Benussi Alice Norton Luciano Pigozzi Vences (as Alan Collin) Gérard Tichy Dr. Kalleway (as Gerard Tichy) Verónica Llimerá Betsy Wester (as Veronica Llimera) Susy Andersen Sdenka (archive footage) (uncredited) Rika Dialina Maria (archive footage) (uncredited) Boris Karloff Gorca (archive footage) Glauco Onorato Giorgio (archive footage) (uncredited)