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.
| Directing | Will Hay | Director |
| Directing | Basil Dearden | Director |
| Art | Thomas N. Morahan | Art Direction |
| Writing | Angus MacPhail | Screenplay |
| Production | John Croydon | Production Supervisor |
| Production | Michael Balcon | Producer |
| Writing | Reg Groves | Idea |
| Writing | Bernard Miles | Idea |
| Editing | Ray Pitt | Editor |
| Writing | John Dighton | Screenplay |
| Sound | Bretton Byrd | Music |
| Sound | Len Page | Sound Recordist |
| Crew | Roy Kellino | Special Effects |
| Camera | Ernest Palmer | Director of Photography |
