James Robertson Justice as Sir Ernest "Lieutenant M.J. Farrow, RN" Pease, KBE, FRS

Leslie Phillips as Flying Officer Jimmy Cooper

Stanley Baxter as Flying Officer S. "Jock" Everett / Major Stamfel

Eric Sykes as Sports Officer Willoughby

Richard Wattis as Entertainments Officer Woodcock

Godfrey Winn as Self

Colin Gordon as Briggs

John Le Mesurier as Escape Officer Piggott

Norman Bird as Senior British Officer Travers

Jeremy Lloyd as Flight Lieutenant J.J. "Bonzo" Baines, DFC

John Forrest as Lieutenant Hans "'Grassy' Green" Kringling

Jean Cadell as Mrs. MacDougall

Peter Myers as Flying Officer P.R. Shaw

Ronnie Stevens as Hankley

Ronald Leigh-Hunt as Clynes

Steve Plytas as Luftwaffe Officer

John Ringham as Flying Officer G.S. "Plum" Poudding

Mark Hardy as Prisoner of War

John Huson as Senior RAF Officer

Joseph Fürst as Luftwaffe Interrogator

Norman Shelley as Fred Whittaker

Brian Oulton as Scientist in Corridor

Frederick Piper as Scientist in Corridor

Joan Haythorne as Miss Rogers

Heidi Erich as German Frau

Lesley Allen as German Frau

Derek Aylward as Stagehand (uncredited)

Vincent Ball as Higgins (uncredited)

Ron Carr as German Guard (uncredited)

Tony Castleton as Stagehand (uncredited)

Billy Cornelius as German Guard (uncredited)

Dan Darnelli as Messenger (uncredited)

Hugo de Vernier as Swiss Commissioner (uncredited)

Jack Dearlove as Prisoner of War (uncredited)

Ed Devereaux as Webber (uncredited)

Archie Duncan as Scottish Captain (uncredited)

Hugh Elton as RAF Officer (uncredited)

Roy Everson as Prisoner of War (uncredited)

Ernest Fennemore as Prisoner of War (uncredited)

Chick Fowles as Prisoner of War (uncredited)

Fred Haggerty as German Guard (uncredited)

Patrick Halpin as TV Crew (uncredited)

Peter Hannon as German Guard (uncredited)

Victor Harrington as Prisoner of War (uncredited)

John Herrington as Swiss Commissioner (uncredited)

Norman Lambert as Prisoner of War (uncredited)

Barry Lowe as Forger (uncredited)

Ned Lynch as Prisoner of War (uncredited)

Fred Machon as German Guard (uncredited)

Richard Marner as German Guard (uncredited)

Nancy Nevinson as German Frau (uncredited)

Ian Parsons as Swiss Commissioner (uncredited)

Cecil Paul as Official (uncredited)

Keith Peacock as German Guard (uncredited)

Joe Phelps as German Guard (uncredited)

Charles Price as Stagehand (uncredited)

Prunella Smith as Audience Member (uncredited)

Reg Thomason as Audience Member (uncredited)

Martin Voss as German Guard (uncredited)

Robert Vossler as Audience Member (uncredited)

David Webb as Prisoner of War (uncredited)

Winnie Wiblin as Guest (uncredited)

John Wilder as Audience Member (uncredited)