 Bud AbbottBud Alexander | Bud Alexander |
 Lou CostelloLou Francis | Lou Francis |
 Nancy GuildHelen Gray | Helen Gray |
 Arthur FranzTommy Nelson | Tommy Nelson |
 Adele JergensBoots Marsden | Boots Marsden |
 Sheldon LeonardBoots Morgan | Boots Morgan |
 William FrawleyDet. Roberts | Det. Roberts |
 Gavin MuirDr. Philip Gray | Dr. Philip Gray |
| SSam BalterRadio Announcer | Radio Announcer |
 John DaheimRocky Hanlon | Rocky Hanlon |
| WWalter F. ApplerProfessor Dugan (uncredited) | Professor Dugan (uncredited) |
 Bobby BarberSneaky (uncredited) | Sneaky (uncredited) |
| HHoward BanksOfficer (uncredited) | Officer (uncredited) |
| RRichard BartellBald Man (uncredited) | Bald Man (uncredited) |
| PPhil BloomFight Spectator (uncredited) | Fight Spectator (uncredited) |
| JJohn BreenTrainer (uncredited) | Trainer (uncredited) |
| MMilt BronsonRing Announcer (uncredited) | Ring Announcer (uncredited) |
| RRalph BrooksMan at Bar (uncredited) | Man at Bar (uncredited) |
 Steve CarruthersReporter (uncredited) | Reporter (uncredited) |
| TTom ColemanDugan Detective School Graduate (uncredited) | Dugan Detective School Graduate (uncredited) |
 Chester ConklinCounter Man (uncredited) | Counter Man (uncredited) |
| BBing ConleyTrainer (uncredited) | Trainer (uncredited) |
 Russ ConwayNewspaperman (uncredited) | Newspaperman (uncredited) |
| PPaul CristoFight Spectator (uncredited) | Fight Spectator (uncredited) |
 Frank DaeCol. Duffie (uncredited) | Col. Duffie (uncredited) |
| RRoy DarmourMan (uncredited) | Man (uncredited) |
 Sayre DearingReporter (uncredited) | Reporter (uncredited) |
| JJack DeeryHospital Visitor (uncredited) | Hospital Visitor (uncredited) |
 Jimmy DimeMan in Gym (uncredited) | Man in Gym (uncredited) |
 Ralph DunnMotorcycle Cop (uncredited) | Motorcycle Cop (uncredited) |
