Andree Melly (Lenora), Keith Michell (The Man), Alan Penn (Karl), Tom Bowan (Kern), Leonard Sachs (Professor Kroz), Diana Lambert (Katina Kroz), Ewen Solon (Inspektor Frink), Philip Stainton (Vent), Clive Baxter (Voller), Peter Swanwick (General Zuglin), Jon Rollason (First sentry), John Howlett (Second sentry), James Wellman (First man), and Dafydd Havard (Second man).