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.
William Potts / Muller
Will Hay
Professor Hoffman
Frank Pettingell
General Von Glotz
Julien Mitchell
Max
Charles Hawtrey
Kurt
Barry Morse
Krauss
Peter Ustinov
Hans
Peter Croft
Lena
Anne Firth
Vogel
Leslie Harcourt
A.D.C.
Jeremy Hawk
Schmidt
Raymond Lovell
Rector
Aubrey Mallalieu
Maj. Bishop
John Williams
Col. Truscott
Lawrence O'Madden
British Pilot
John Boxer
MI5 Man (uncredited)
Clifford Buckton
Detective Carter (uncredited)
Arthur Denton
German Soldier on Train
Leslie Dwyer
German Pilot
Richard George
SS Guard
Walter Gotell
German Officer at Station
William Hartnell
Airport Official
Bryan Herbert
Member of the General Staff
Vincent Holman
Passenger Arrested on Train
Charles Paton
Train Passenger
Lloyd Pearson
1st Observer (uncredited)
Johnnie Schofield
SS Guard (uncredited)
Harry Terry
Detective Evans (uncredited)
Jack Vyvyan
SS Officer on Train (uncredited)
H Victor Weske