- Julian Mitchellscreenplay &
- Stanley Pricescreenplay &
- Peter Stonescreenplay (as Pierre Marton)
- Gordon Cotlernovel "The Cypher"
Rest of cast listed alphabetically
- Lewis Alexander(uncredited)
- Jack Armstrong(uncredited)
- Peter Avella(uncredited)
- Roy Beck(uncredited)
- Paul Beradi(uncredited)
- Ernest Blyth(uncredited)
- George Curtis(uncredited)
- Peter Evans(uncredited)
- Roy Everson(uncredited)
- Chick Fowles(uncredited)
- Jimmy Gardner(uncredited)
- Jill Goldston(uncredited)
- Gordon Griffin(uncredited)
- Victor Harrington(uncredited)
- Eric Henderson(uncredited)
- Gerry Judge(uncredited)
- Juba Kennerley(uncredited)
- Aileen Lewis(uncredited)
- Harry Locke(uncredited)
- Colin McKenzie(uncredited)
- Malya Nappi(uncredited)
- James Payne(uncredited)
- John Preston(uncredited)
- Jack Ross(uncredited)
- Robert Rowland(uncredited)
- Julie Shaw(uncredited)
- Jack Silk(uncredited)
- Fred Stroud(uncredited)
- John Tatham(uncredited)
- Larry Taylor(uncredited)
- Joe Wadham(uncredited)
- Stanley Donenproducer
- Denis Holtassociate producer
- Christopher Challisdirector of photography
- W.T. Partletonmakeup artist
- David W. Ortonproduction manager
- John Jordansecond unit director (as John M. Jordan)
- Eric Rattrayassistant director
- Stuart Blackthird assistant director (uncredited)
- Terence A. Cleggsecond assistant director (uncredited)
- Richard Houltthird assistant director (uncredited)
- Bill Bennisondraughtsman (uncredited)
- David Billdraughtsman (uncredited)
- John Chisholmstandby props (uncredited)
- Roy Dormandraughtsman (uncredited)
- Robert McGinnisposter artist (uncredited)
- C. Le Mesuriersound mixer (as C. Le Messurier)
- John W. Mitchellsound mixer
- Don Sharpedubbing editor
- Ken Barkerdubbing crew (uncredited)
- Ron Butchersound maintenance (uncredited)
- Archie Ludskiadditional dubbing editor (uncredited)
- Keith Pamplinboom operator (uncredited)
- Larry Thompsonsound camera operator (uncredited)
- Wally Armitagespecial effects foreman (uncredited)
- Garth Innsspecial effects technician (uncredited)
- Cliff Richardsonspecial effects (uncredited)
- John Richardsonspecial effects assistant (uncredited)
- Jimmy Wardspecial effects technician (uncredited)
- Roy Whybrowspecial effects (uncredited)
- Charles Staffellback projection (uncredited)
- Vic Armstronghorse stunt double: Gregory Peck (uncredited) / stunts (uncredited)
- Pam de Boulaystunt double: Sophia Loren (uncredited)
- Peter Diamondstunt double: (uncredited)
- Jimmy Lodgestunt coordinator (uncredited) / stunt double: Gregory Peck (uncredited)
- Alan Stuartstunt driver: Gregory Peck (uncredited)
- Larry Taylorstunts (uncredited)
- Joe Wadhamstunts (uncredited)
- Austin Dempstercamera operator
- Harry Blackgaffer (uncredited)
- Colin Corbyfocus puller (uncredited)
- Nigel Cousinsclapper loader (uncredited)
- Michael Garfathfocus puller: second unit (uncredited)
- Norman Gryspeerdtstill photographer (uncredited)
- Laurie Shaneelectrician (uncredited)
- Pepita Fairfaxsecond assistant editor (uncredited)
- Jack Gardnerfirst assistant editor (uncredited)
- Thom Nobleassistant editor (uncredited)
- Vince De Rosamusician: french horn (uncredited)
- Douglas Gamleyorchestrator (uncredited)
- Henry Manciniconductor (uncredited) / music arranger (uncredited)
- Richard Nashmusician: trombone soloist (uncredited)
- Emil Richardsmusician: drums, percussion (uncredited)
- John Scottmusician: flute, saxophone (uncredited)
- Connie Williscontinuity (as Constance Willis)
- Maurice Bindertitle designer: main title
- Arthur Carrollproduction executive
- Michael Falloonproduction runner (uncredited) / runner (uncredited)
- David Michael Kayaviation services (uncredited)
- Doreen Landrypublicity director (uncredited)
- Maurice Landsbergerproduction accountant (uncredited)
Crew verified as complete
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