'Hall porter forced to join Navy while tracking spies.' (British Film Catalogue)
| Actor | Role |
|---|---|
| EErnie LotingaJimmy Josser | Jimmy Josser |
| JJack FrostSpud | Spud |
 Jack HobbsLieutenant Commander Cole | Lieutenant Commander Cole |
| CCyril McLaglenLangford | Langford |
| HH. Saxon-SnellLing Foo | Ling Foo |
 Lesley WareingLeslie Beauchamp | Leslie Beauchamp |
 Renee GaddPolly | Polly |
 Charles PatonProfessor Black | Professor Black |
| FFlorence VieMrs Black | Mrs Black |
| LLeslie StilesThe Admiral | The Admiral |
| KKenneth BuckleyNot listed | Not listed |