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.
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The Goose Steps Out is a British film released in 1942, starring Will Hay, who also co-directed with Basil Dearden. It is a comedy of mistaken identity, with Hay acting as a German spy and also an Englishman who is his double. It was the film debut of Peter Ustinov.