Including Richard Denning (Major Gregory Keen), Carole Mathews (Hedy Bergner), Ronald Adam (Scammel / Dumetrius), Danny Green (Yotti Blum), Brian Worth (Capt. Peter Ridgeway), Jan Holden (Sally Jennings), Hugh Moxey (Sgt. Tom Coutts), Peter Swanwick (Monsieur Paul Bonnet), Elwyn Brook-Jones (Digby Mitchel), Ronald Leigh-Hunt (Col. Julian Fentriss, M.I.5.), Robert O'Neil (Capt. Hank Godowski), Paul Hardmuth (Dr Buchmann), Bill Nagy (Marzotti), and Alex Gallier (Max Rubenstein).