 William GarganJames Montgomery 'Jim' Wilson | James Montgomery 'Jim' Wilson |
 Irene HerveyFrankie Gilroy Wilson | Frankie Gilroy Wilson |
 Charles LangTex Harper | Tex Harper |
 Maria MontezSonya Dietrich Landers | Sonya Dietrich Landers |
 Lloyd CorriganGeorge Lewis | George Lewis |
 Mary GordonAbigail 'Mag' MacPherson | Abigail 'Mag' MacPherson |
 Truman BradleyDr. Gregory Landers | Dr. Gregory Landers |
 Phillip TrentTom Hare | Tom Hare |
 Turhan BeyCaptain Chundra | Captain Chundra |
 John BagniPaul, the Purser | Paul, the Purser |
 George LynnBland (as Peter Lynn) | Bland (as Peter Lynn) |
 Billy WayneLamb | Lamb |
 Wade BotelerChristopher Ruggles | Christopher Ruggles |
 Warren AsheR. C. Bradford | R. C. Bradford |
 J. Pat O'MalleyChief inspector | Chief inspector |
 C. Montague ShawCaptain Caldwell | Captain Caldwell |
| PPhilip AhlmSubmarine Gun Crewman (uncredited) | Submarine Gun Crewman (uncredited) |
 Edgar BarrierMan on Intercom (voice) (uncredited) | Man on Intercom (voice) (uncredited) |
| HHarold DanielsSam | Sam |
 Paul DubovNews photographer | News photographer |
 Roland GotBellhop (uncredited) | Bellhop (uncredited) |
 Eddie HallSubmarine Crewman firing on the Bombay Clipper (uncredited) | Submarine Crewman firing on the Bombay Clipper (uncredited) |
 Riley HillSteward (uncredited) | Steward (uncredited) |
| KKeith HitchcockHotel clerk | Hotel clerk |
| JJack G. LeeNews photographer | News photographer |
| CConnie LeonChambermaid | Chambermaid |
 Lal Chand MehraGuard (uncredited) | Guard (uncredited) |
 John PicorriWaiter | Waiter |
 Beatrice RobertsMiss Kane - Secretary (uncredited) | Miss Kane - Secretary (uncredited) |
| MMel RuickSubmarine commander | Submarine commander |
