 Tallulah BankheadDiana Sturm | Diana Sturm |
 Gary CooperLt. Sempter | Lt. Sempter |
 Charles LaughtonCmdr. Charles Sturm | Cmdr. Charles Sturm |
 Cary GrantLt. Jaeckel | Lt. Jaeckel |
 Paul PorcasiHassan | Hassan |
 Juliette ComptonMrs. Planet | Mrs. Planet |
 Henry KolkerHutton | Hutton |
 Dorothy ChristyMrs. Crimp | Mrs. Crimp |
 Arthur HoytMr. Planet | Mr. Planet |
 Gordon WestcottLt. Toll | Lt. Toll |
| JJames DuganCondover | Condover |
 Peter BroccoWireless Operator (uncredited) | Wireless Operator (uncredited) |
| JJack GardnerSubmarine Crewman (uncredited) | Submarine Crewman (uncredited) |
| JJohn GeorgeMan in Crowd (uncredited) | Man in Crowd (uncredited) |
| HHenry GuttmanSubmarine Crewman (uncredited) | Submarine Crewman (uncredited) |
 Fred Kohler Jr.Submarine Crewman (uncredited) | Submarine Crewman (uncredited) |
 George MagrillSubmarine Crewman (uncredited) | Submarine Crewman (uncredited) |
 Dave O'BrienSubmarine Crewman (uncredited) | Submarine Crewman (uncredited) |
 Anderson LawlerSailor (uncredited) | Sailor (uncredited) |
 Lucien LittlefieldShopkeeper (uncredited) | Shopkeeper (uncredited) |
 Wilfred LucasCourt Martial Judge (uncredited) | Court Martial Judge (uncredited) |
 Kent TaylorA Friend at Party (uncredited) | A Friend at Party (uncredited) |
