 Claude HulbertLlewellyn Davies, 'The Admiral' | Llewellyn Davies, 'The Admiral' |
 Michael WildingJohnny | Johnny |
 Carla LehmannJane | Jane |
 Tommy TrinderTommy Taylor | Tommy Taylor |
 Jeanne De CasalisMrs. Pilkington | Mrs. Pilkington |
 Henry HewittProf. Pilkington | Prof. Pilkington |
 John LaurieMcNab | McNab |
 James HayterHans | Hans |
| BBrian FitzpatrickDigby | Digby |
 Harold WarrenderPilot's Mate | Pilot's Mate |
| EEric ClaveringBartender | Bartender |
 John Glyn-JonesBest Man | Best Man |
| JJulian VedeyResident of Tangier | Resident of Tangier |
 John WengrafGerman Captain | German Captain |
 Manning WhileyGerman Commdr. | German Commdr. |
| VVictor FairleyGerman Petty Officer | German Petty Officer |
 Robert RendelBritish Captain | British Captain |
 Allan JeayesBritish Commdr. | British Commdr. |
 Alec ClunesBritish Pilot | British Pilot |
| DDerek ElphinstoneBritish Observer | British Observer |
| JJonny BloorMinor Role (uncredited) | Minor Role (uncredited) |
| HHarold CoyneSailor (uncredited) | Sailor (uncredited) |
| EE. V. H. EmmettNewsreel Commentator (voice) | Newsreel Commentator (voice) |
 Danny GreenNightclub Bouncer (uncredited) | Nightclub Bouncer (uncredited) |
 Bryan HerbertPetty Officer on HMS Ferocious (uncredited) | Petty Officer on HMS Ferocious (uncredited) |
| OOlaf OlsenMinor Role (uncredited) | Minor Role (uncredited) |
| TTao PorchonMinor Role (uncredited) | Minor Role (uncredited) |
 Johnnie SchofieldOfficer Reading Heliograph Message (uncredited) | Officer Reading Heliograph Message (uncredited) |
