Rod Taylor (Marian Casey), Stuart Whitman (Stack Baker), Elke Sommer (Ursula), Jeremy Kemp (Reginald Landers), Bob Phillips (Joe), Jennie Sherman (Debbie), Keenan Wynn (Meat Cleaver Stewart), Keith Foote (Lincoln), Dan Jackson (Supt. Prinz), Patrick Wymore (Shelley), Patricia Hornung (Alicia), Hans Kahn (German captain), Paul Methuen (Merril Jr), Joanna Wilhelm (Merril Jr.'s wife), Dermot Hussey (Stevan), Robert Ghisay (Curator), David Sutherland (Waiter), Terry Wilson (German seaman), and Lawrence Williams (Clinton).