 Richard DixJohn Sinclair / John Carter | John Sinclair / John Carter |
 Lynn MerrickJoan Martin Sinclair | Joan Martin Sinclair |
 Rhys WilliamsErnie Sparrow | Ernie Sparrow |
 James CardwellFred (Doc) Graham | Fred (Doc) Graham |
 Tom KennedyFerdinand / Hammerlock | Ferdinand / Hammerlock |
 Sam AshGibson Motor Car Co. Executive (uncredited) | Gibson Motor Car Co. Executive (uncredited) |
 Egon BrecherDr. Rose (replaced by Frank Reicher) (uncredited) | Dr. Rose (replaced by Frank Reicher) (uncredited) |
 Charles ColemanSinclair's Butler (uncredited) | Sinclair's Butler (uncredited) |
| OOtto ForrestThe Whistler (uncredited) | The Whistler (uncredited) |
 Byron FoulgerGeorgie (uncredited) | Georgie (uncredited) |
 Martín GarralagaTony, Fruit Peddler (uncredited) | Tony, Fruit Peddler (uncredited) |
 John HamiltonDoctor (uncredited) | Doctor (uncredited) |
 Stuart HolmesSinclair Executive (uncredited) | Sinclair Executive (uncredited) |
 Wilbur MackSinclair Executive (uncredited) | Sinclair Executive (uncredited) |
| CCharles MarshSinclair Executive (uncredited) | Sinclair Executive (uncredited) |
 Harold MillerSinclair Executive (uncredited) | Sinclair Executive (uncredited) |
 Forbes MurraySinclair Executive (uncredited) | Sinclair Executive (uncredited) |
 Gigi PerreauBobbie (uncredited) | Bobbie (uncredited) |
 Frank ReicherDr. Rose (uncredited) | Dr. Rose (uncredited) |
 Clinton RosemondTrain Porter (uncredited) | Train Porter (uncredited) |
 Frank J. ScannellDruggist (uncredited) | Druggist (uncredited) |
 Minerva UrecalGeorgie's Wife (uncredited) | Georgie's Wife (uncredited) |
 Robert B. WilliamsPharmacist (uncredited) | Pharmacist (uncredited) |
 Douglas WoodPaul Kitridge - Attorney (uncredited) | Paul Kitridge - Attorney (uncredited) |
