Basil Dearden (Director) · Will Hay (Director) · Angus MacPhail (Screenplay) · John Dighton (Screenplay)
Will Hay
William Potts / Muller
Frank Pettingell
Professor Hoffman
Julien Mitchell
General Von Glotz
Charles Hawtrey
Max
Barry Morse
Kurt
Peter Ustinov
Krauss
Peter Croft
Hans
Anne Firth
Lena
Leslie Harcourt
Vogel
Jeremy Hawk
A.D.C.
Raymond Lovell
Schmidt
Aubrey Mallalieu
Rector
John Williams
Maj. Bishop
Lawrence O'Madden
Col. Truscott
John Boxer
British Pilot
Clifford Buckton
MI5 Man (uncredited)
Arthur Denton
Detective Carter (uncredited)
Leslie Dwyer
German Soldier on Train
Richard George
German Pilot
Walter Gotell
SS Guard
William Hartnell
German Officer at Station
Bryan Herbert
Airport Official
Vincent Holman
Member of the General Staff
Charles Paton
Passenger Arrested on Train
Lloyd Pearson
Train Passenger
Johnnie Schofield
1st Observer (uncredited)
Harry Terry
SS Guard (uncredited)
Jack Vyvyan
Detective Evans (uncredited)
H Victor Weske
SS Officer on Train (uncredited)
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Schoolteacher William Potts is the double of a captured German spy, so he is sent to Germany by British Intelligence to obtain the plans of a new secret weapon, causing chaos in a Hitler Youth school in the process.
