William Castle Director, Producer Tom Poston Tom Penderel Actor Robert Morley Roderick Femm Actor Janette Scott Cecily Femm Actor Joyce Grenfell Agatha Femm Actor Peter Bull Caspar Femm, Jasper Femm Actor Mervyn Johns Petiphar Femm Actor Fenella Fielding Morgana Femm Actor Danny Green Morgan Femm Actor Robert Dillon Writer J.B. Priestley Writer Benjamin Frankel Original Music Arthur Grant Cinematographer James Needs Film Editing Bernard Robinson Production Design Molly Arbuthnot Costume Design