"The incredible but true story of how an impersonator was recruited to impersonate General Montgomery to mislead the Germans about his intentions before the North Africa campaign."
John Mills
as Major Harvey
Cecil Parker
as Colonel E.F. Logan
Sid James
as Porter YMCA
Bryan Forbes
as Butterfield
Barbara Hicks
as Hester
Michael Hordern
as Governor of Gibralter
Marius Goring
as Karl Nielson
Vera Day
as Angela
M.E. Clifton James
as Himself / General Montgomery
Patrick Allen
as Col. Mathers
Patrick Holt
as Col. Dawson
Leslie Phillips
as Major Tennant
Duncan Lamont
as Wing Cdr. Bates
Anthony Sagar
as Villa - Guard Sergeant
Kenneth J. Warren
as F/O Davies
James Hayter
as Sgt. Adams
Brian Weske
as Despatch Rider
Harry Fowler
as Civilian - End Scene
Bill Nagy
as American Captain
Edward Judd
as Another Soldier
Victor Maddern
as Orderly Sergeant
Desmond Roberts
as Brigadier
Victor Beaumont
as Gottmann - Commando
Alfie Bass
as The Small Man
John Le Mesurier
as Adjutant RAPC
Walter Gotell
as German Colonel
George Eugeniou
as Garcia
John G. Heller
as German Sergeant
Frederick Jaeger
as Junior German Officer
David Lodge
as Sergeant RAPC
MacDonald Parke
as American General
Marne Maitland
as Arab Proprietor
Maureen Connell
as Peggy
Sam Kydd
as Go-Between
Allan Cuthbertson
as Guards Officer
Ronnie Stevens
as MI5 Tail
Steven Berkoff
as Minor Role (uncredited)
John Guillermin
Director
Basil Emmott
Director of Photography
Max Benedict
Editor
Maxwell Setton
Producer
Screenplay
Wilfred Shingleton
Production Design
John Addison
Original Music Composer
Book
Laurie Ridley
Still Photographer
Fred Ryan
Sound Recordist