 Lee PowellLieutenant Tom Grayson | Lieutenant Tom Grayson |
 Bruce BennettLieutenant Frank Corby | Lieutenant Frank Corby |
 Eleanor StewartJanet Warfield | Janet Warfield |
 Montagu LoveGeneral White | General White |
 Hugh SothernBen Warfield | Ben Warfield |
 Sam FlintColonel Grayson | Colonel Grayson |
| PPerry IvinsCrenshaw | Crenshaw |
 Forrest TaylorBenson | Benson |
 John PicorriProfessor Gould | Professor Gould |
 Carleton YoungJohnson, 'Aurora' Crewman | Johnson, 'Aurora' Crewman |
 John DavidsonLin Wing | Lin Wing |
| HHenry OthoSam Hedges, the Gardener | Sam Hedges, the Gardener |
| RReed HowesParker--Sub Crewman | Parker--Sub Crewman |
 Tom LondonHenchman Wilson | Henchman Wilson |
 Edmund CobbHenchman Ellis | Henchman Ellis |
| AAlan GreggHenchman Marco | Henchman Marco |
| AAllen MatthewsTodd--Submarine Captain | Todd--Submarine Captain |
 Benson FongGehorda Outlaw (uncredited) | Gehorda Outlaw (uncredited) |
 Theodore Lorch'Wing' Henchman (uncredited) | 'Wing' Henchman (uncredited) |
 Victor WongMikichan (uncredited) | Mikichan (uncredited) |
 Larry SteersKing (uncredited) | King (uncredited) |
 John MertonThompson (uncredited) | Thompson (uncredited) |
 Lester DorrThe Lightning (uncredited) | The Lightning (uncredited) |
| GGeorge DeNormandMarine Guard at Burton Street (uncredited) | Marine Guard at Burton Street (uncredited) |
 Frank BakerGeneral Snell (uncredited) | General Snell (uncredited) |
 Jack IngramDirigible Radioman (uncredited) | Dirigible Radioman (uncredited) |
 Monte MontagueJacobs (uncredited) | Jacobs (uncredited) |
 Buddy RooseveltLieutenant of the 'Pawnee' (uncredited) | Lieutenant of the 'Pawnee' (uncredited) |
 Al TaylorBearded Sailor (uncredited) | Bearded Sailor (uncredited) |
 Duke YorkSam (uncredited) | Sam (uncredited) |
