Merchant seaman Archie Gibbs manages to survive when his ship is torpedoed by a German submarine. Disguising himself in the uniform of a dead Nazi spy, Gibbs is picked up by the Nazi U-boat. He manages to convince the German sailors that he's the spy, and in this guise he tries to rescue a group of captured Allied scientists.
| Actor | Role |
|---|---|
 Bruce BennettArchie Gibbs | Archie Gibbs |
 Erik RolfKapitaen Ganz, The U-Boat Captain | Kapitaen Ganz, The U-Boat Captain |
 John AbbottAlfonse Lamont | Alfonse Lamont |
 John WengrafGunther Rudehoff, Gestapo Agent | Gunther Rudehoff, Gestapo Agent |
 Robert B. WilliamsDestroyer Commander Tom Bristol | Destroyer Commander Tom Bristol |
 Trevor BardetteConvoy Ship Commander (uncredited) | Convoy Ship Commander (uncredited) |
 Anthony CarusoBenny, Seaman's Union Hall Man (uncredited) | Benny, Seaman's Union Hall Man (uncredited) |
 Eric FeldaryHans Braustig, Injured Sailor (uncredited) | Hans Braustig, Injured Sailor (uncredited) |
 Ray TealC.P.O. Shaw (uncredited) | C.P.O. Shaw (uncredited) |