Fred Francis Director Jack Palance Ronald Wyatt Actor Burgess Meredith Dr. Diabolo Actor Beverly Sassoon Carla Hayes Actor Peter Cushing Lancelot Canning Actor Barbara Ewing Dorothy Endicott Actor Michael Bryant Colin Williams Actor Maurice Denham Actor John Standing Leo Winston Actor Robert Hutton Bruce Benton Actor John Phillips Eddie Storm Actor Michael Ripper Gordon Roberts Actor Bernard Kay Dr. Heim Actor Catherine Finn Nurse Parker Actor Ursula Howells Miss Maxine Actor Niall MacGinnis Dr. Silversmith Actor Timothy Bateson Actor David Bauer Mike Charles Actor Nicole Shelby Millie Actor Clytie Jessop Atropos Actor Michael Hawkins Constable Actor Hedger Wallace Actor Frank Forsyth Actor Roy Stevens Constable Actor Geoffrey Wallace Actor James Copeland Fred Actor Norman Claridge Police Sergeant Actor Roy Goldfrey Collector Actor Barry Low Tramp Actor Max Rosenberg Producer Milton Subotsky Producer