 Leslie BanksTaylor | Taylor |
 Michael RedgraveRussian | Russian |
 Will HaySkipper | Skipper |
 John MillsTom | Tom |
 Bernard MilesRoyal Navy Mate | Royal Navy Mate |
 Michael RennieGeorge | George |
 Frank CellierSchneider | Schneider |
 Robert MorleyVon Geiselbrecht | Von Geiselbrecht |
 Alfred DraytonDirektor | Direktor |
 Marius GoringGerman Propaganda Officer | German Propaganda Officer |
 Austin TrevorU-boat Captain | U-boat Captain |
 Albert LievenGunter | Gunter |
| LLeif KonowDane | Dane |
 John StuartRoyal Navy: Naval Officer | Royal Navy: Naval Officer |
 Morland GrahamCivil Service | Civil Service |
 John BoxerPress | Press |
 Cyril ChamberlainPress | Press |
| EElliott MasonGerman: German Stationmistress | German: German Stationmistress |
 George MerrittGerman: German Shelter Marshal | German: German Shelter Marshal |
| BBernard RebelQuisling | Quisling |
 George WoodbridgeQuisling | Quisling |
 Ronald AdamGerman businessman (uncredited) | German businessman (uncredited) |
| MMark DalyDriver (uncredited) | Driver (uncredited) |
 Thora HirdGerman barmaid (uncredited) | German barmaid (uncredited) |
 Frederick PiperMalta official (uncredited) | Malta official (uncredited) |
 Ronald ShinerShipping clerk (uncredited) | Shipping clerk (uncredited) |
 Manning WhileyNaval officer (uncredited) | Naval officer (uncredited) |
 Michael WildingCaptain (uncredited) | Captain (uncredited) |
 John WilliamsVoice over (uncredited) | Voice over (uncredited) |
