Cast & crew credits
| Will Hay | Dr. Benjamin Twist |
| Moore Marriott | Jerry, The Mole |
| Graham Moffatt | Albert |
| Googie Withers | Lottie |
| Peter Gawthorne | Sir Cyril |
| Basil Radford | Deputy Governor |
| Dennis Wyndham (as Denis Wyndham) | Head Warder |
| Wilfrid Walter | Max Slessor |
| Alf Goddard | Sykes |
| Garry Marsh | Johnson |
| Basil McGrail | Bates |
| Ben Soutten | Raymond |
| Teddy Brown | Slim Charlie |
| Kathleen Harrison | Mabel |
| Roy Emerton | Colonial |
| Ralph Smart | Writer (Adapted By) |
| Jack Davis Jnr | Writer (Adapted By) |
| Cyril Campion | Story |
| Marcel Varnel | Director |
| R.E. Dearing | Editor |
| Alex Vetchinsky (as Vetchinsky) | Production Designer |
| Arthur Crabtree | Director of Photography |
| Val Guest | Scenario |
| Marriott Edgar | Scenario |