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Will Hay as Dr. Benjamin Twist |
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Moore Marriott as Jerry The Mole |
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Graham Moffatt as Albert Brown |
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Googie Withers as Lottie |
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Peter Gawthorne as Sir Cyril |
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Basil Radford as Deputy Governor |
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Wilfred Walter as Max Slessor |
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Dennis Wyndham as Head Warder |
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Alf Goddard as Sykes |
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Basil McGrail as Bates |
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Kathleen Harrison as Mabel |
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Roddy McDowall as Jimmy |
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Teddy Brown as Slim Charlie |
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Bertha Belmore as Tiara Lady |
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George Merritt as Patrolman |
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Roy Emerton as John Benjamin |
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Leonard Sharp as Convict |
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Garry Marsh as Johnson |
| Directing | Marcel Varnel | Director |
| Crew | Arthur Crabtree | Cinematography |
| Writing | Cyril Campion | Writer |
| Writing | Jack Davis Jr. | Writer |
| Writing | Marriott Edgar | Writer |
| Writing | Val Guest | Writer |
| Writing | Ralph Smart | Writer |
| Production | Edward Black | Producer |
| Editing | R. E. Dearing | Editor |
