Will Hay

Character: William Potts / Muller

Frank Pettingell

Character: Professor Hoffman

Julien Mitchell

Character: General Von Glotz

Charles Hawtrey

Character: Max

Barry Morse

Character: Kurt

Peter Ustinov

Character: Krauss

Peter Croft

Character: Hans

Anne Firth

Character: Lena

Leslie Harcourt

Character: Vogel

Jeremy Hawk

Character: A.D.C.

Raymond Lovell

Character: Schmidt

Aubrey Mallalieu

Character: Rector

John Williams

Character: Maj. Bishop

Lawrence O'Madden

Character: Col. Truscott

John Boxer

Character: British Pilot

Clifford Buckton

Character: MI5 Man (uncredited)

Arthur Denton

Character: Detective Carter (uncredited)

Leslie Dwyer

Character: German Soldier on Train

Richard George

Character: German Pilot

Walter Gotell

Character: SS Guard

William Hartnell

Character: German Officer at Station

Bryan Herbert

Character: Airport Official

Vincent Holman

Character: Member of the General Staff

Charles Paton

Character: Passenger Arrested on Train

Lloyd Pearson

Character: Train Passenger

Johnnie Schofield

Character: 1st Observer (uncredited)

Harry Terry

Character: SS Guard (uncredited)

Jack Vyvyan

Character: Detective Evans (uncredited)

H Victor Weske

Character: SS Officer on Train (uncredited)