Regia

• Maclean Rogers — director
• Don Weeks — assistant director

Sceneggiatura

• Maclean Rogers — writer
• Lindsay Hardy — novel

Cast

• Richard Denning — Major Gregory Keen
• Carole Mathews — Hedy Bergner
• Ronald Adam — Scammel / Dumetrius
• Danny Green — Yotti Blum
• Brian Worth — Capt. Peter Ridgeway
• 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 Vincent O'Neil — Capt. Hank Godowski
• Paul Hardtmuth — Dr. Buchmann
• Bill Nagy — Marzotti
• Alex Gallier — Max Rubenstein
• Robert Crewdson — Control Officer
• Jimmy Cains — Gassner
• Edward Forsyth — German Policeman
• Theodore Wilhelm — German Thug
• Robert Bruce — Staff Officer
• Jan Holden — Sally Jennings

Produzione

• William G. Chalmers — producer
• Clive Midwinter — production manager
• Richard Gordon — co-producer

Fotografia

• Ernest Palmer — director of photography

Sonoro

• Wilfred Burns — original music composer
• Aubrey Lewis — sound

Scenografia

• John Stoll — art direction

Montaggio

• Peter Mayhew — editor