 Wallace BeeryJohn Thorson | John Thorson |
 Chester Morris'Rocky' Blake | 'Rocky' Blake |
 Virginia GreySusan Thorson | Susan Thorson |
 Douglass DumbrilleDistrict Commander | District Commander |
 Carl EsmondU-Boat Captain | U-Boat Captain |
 Clem Bevans'Cap' Finch | 'Cap' Finch |
 John QualenMilo | Milo |
 Regis ToomeyIves | Ives |
 Henry VictorGerman U-Boat Officer | German U-Boat Officer |
 Addison RichardsAdmiral Ross | Admiral Ross |
| HHans JobyU-Boat Petty Officer | U-Boat Petty Officer |
 Henry HunterEnsign Dyer | Ensign Dyer |
 Jonathan HaleAdmiral Girard | Admiral Girard |
 Leon AmesRecruiting Officer (uncredited) | Recruiting Officer (uncredited) |
| AArthur BelascoFisherman (uncredited) | Fisherman (uncredited) |
 Joseph E. BernardFisherman (uncredited) | Fisherman (uncredited) |
 Wade BotelerRecruiting Officer (uncredited) | Recruiting Officer (uncredited) |
 Al BridgeFisherman (uncredited) | Fisherman (uncredited) |
 Rand BrooksListener (uncredited) | Listener (uncredited) |
 Don CastleRadio Operator (uncredited) | Radio Operator (uncredited) |
| JJack ChapinSailor (uncredited) | Sailor (uncredited) |
 Tom ChattertonLieutenant (uncredited) | Lieutenant (uncredited) |
 Jack Rube CliffordCaptain (uncredited) | Captain (uncredited) |
 Jules CowlesMan with Finch (uncredited) | Man with Finch (uncredited) |
| LLeigh De LaceyMrs. Gill (uncredited) | Mrs. Gill (uncredited) |
 Joe De StefaniFisherman (uncredited) | Fisherman (uncredited) |
 Edgar DearingPetty Officer (uncredited) | Petty Officer (uncredited) |
| RRichard ElmoreLookout (uncredited) | Lookout (uncredited) |
 Frank FaylenRecruiting Officer (uncredited) | Recruiting Officer (uncredited) |
 Budd FineSurvivor (uncredited) | Survivor (uncredited) |
