 Don 'Red' BarryMike O'Hara, "King Cobra" | Mike O'Hara, "King Cobra" |
 Sheila RyanJanet 'J.L.' Brannigan | Janet 'J.L.' Brannigan |
 Tom BrownJoe O'Hara | Joe O'Hara |
 Joseph CrehanOscar Brannigan | Oscar Brannigan |
 John CasonTiger Johnson | Tiger Johnson |
| TTony CanzoneriSwinger Markham | Swinger Markham |
| JJoey AdamsDuke Hensel | Duke Hensel |
 William EdmundsProfessor Berger | Professor Berger |
| EEdit AngoldMama Berger | Mama Berger |
 Margia DeanJoy White | Joy White |
| HHarry BrownFight Manager | Fight Manager |
 Lyle TalbotRadio Announcer | Radio Announcer |
 Michael VallonBettor | Bettor |
 Sam FlintDoctor | Doctor |
| FFrankie VanReferee | Referee |
| DDan TobeyFight Announcer | Fight Announcer |
| JJames J. CasinoBoxer (uncredited) | Boxer (uncredited) |
| NNed RobertsFighter (uncredited) | Fighter (uncredited) |
| JJimmy MartinFight Second | Fight Second |
 Chester CluteTimid Man | Timid Man |
 Jack PerryTrainer (uncredited) | Trainer (uncredited) |
| JJohn BreenFight Spectoator (uncredited) | Fight Spectoator (uncredited) |
 Noble 'Kid' ChissellFight Spectator (uncredited) | Fight Spectator (uncredited) |
| BBobby HenshawFight Spectator (uncredited) | Fight Spectator (uncredited) |
 Charles MortonFight Spectator (uncredited) | Fight Spectator (uncredited) |
 Sol MurgiFight Spectator (uncredited) | Fight Spectator (uncredited) |
 Stanley PriceFight Spectator (uncredited) | Fight Spectator (uncredited) |
| MMark PlantGangster | Gangster |
 Harvey ParryBit Role (uncredited) | Bit Role (uncredited) |
 Al BainFight Spectator (uncredited) | Fight Spectator (uncredited) |
