 Robert NewtonCapt. David Grant | Capt. David Grant |
 Raymond LovellPaul Faber | Paul Faber |
 Guy MiddletonCapt. Tony Hunter | Capt. Tony Hunter |
 Muriel PavlowMarion Decker | Marion Decker |
 Herbert LomKeitel | Keitel |
| JJohn RuddockBowman | Bowman |
 Martin MillerProfessor Hansen | Professor Hansen |
 Brenda BruceLily Leggett | Lily Leggett |
| GGerald CaseInspector Emerson | Inspector Emerson |
 Scott ForbesLieut. Allen (as Julian Dallas) | Lieut. Allen (as Julian Dallas) |
 Leslie DwyerGeorge Leggett | George Leggett |
 Valentine DyallSir George Bell | Sir George Bell |
| DDerek ElphinstoneNaval Surgeon | Naval Surgeon |
 Bruce GordonHood | Hood |
 Marius GoringFrederick Jannings | Frederick Jannings |
| GGeorge HirsteStation Official | Station Official |
| HHubert LeslieTicket Collector | Ticket Collector |
 Olga LindoMrs. Coleman | Mrs. Coleman |
| SStuart LindsellInspector Martin | Inspector Martin |
 Gordon McLeodInspector Longhurst | Inspector Longhurst |
 Joan MaudeSidney Vane | Sidney Vane |
| LLawrence O'MaddenCaptain Robert Wilson | Captain Robert Wilson |
 Hay PetrieStation Master | Station Master |
 Wilfrid Hyde-WhiteTaxi Driver | Taxi Driver |
 Howard DouglasHotel Porter (uncredited) | Hotel Porter (uncredited) |
 Johnnie SchofieldFactory Watchman (uncredited) | Factory Watchman (uncredited) |
 John StoneYoung Newlywed (uncredited) | Young Newlywed (uncredited) |
