Don Sharp Director Rod Steiger Niall Hennessy Actor Lee Remick Kate Brooke Actor Richard Johnson Insp. Hollis Actor Trevor Howard Comdr. Rice Actor Peter Egan Williams Actor Eric Porter Tobin Actor Ian Hogg Gerry Actor Stanley Lebor Hawk Actor John Hallam Boyle Actor Patrick Stewart Tilney Actor David Collings Covey Actor John Shrapnel Tipaldi Actor Margery Mason Housekeeper Actor Paul Brennan Maguire Actor Peter Snell Producer Samuel Z. Arkoff Executive Producer John Gay Screenwriter John Scott Original Music Ernest Steward Cinematographer Eric Boyd-Perkins Film Editing Irene Lamb Casting Ray Simm Production Design Bert Davey Art Director