Michael Reeves Director, Screenwriter Boris Karloff Prof. Marcus Monserrat Actor Catherine Lacy Estelle Monserrat Actor Ian Ogilvy Mike Roscoe Actor Elizabeth Ercy Nicole Actor Victor Henry Alan Actor Susan George Audrey Woods Actor Dinah Sheridan Laura Ladd Actor Ivor Dean Insp. Matalon Actor Peter Fraser Detective George Actor Meier Tzelniker The Jewish Baker Actor Bill Barnsley Constable Actor Martin Terry Actor Gerald Campion Actor Patrick Curtis Producer Tony Tenser Producer Arnold L. Miller Executive Producer Tom Baker Screenwriter Paul Ferris Original Music Stanley A. Long Cinematographer Susan Michie Film Editing Ralph Sheldon Film Editing David Woodward Film Editing Tony Curtis Art Director