 Leon ErrolKnobby Walsh | Knobby Walsh |
 Joe Kirkwood Jr.Joe Palooka | Joe Palooka |
 Elyse KnoxAnne Howe | Anne Howe |
 Eduardo CiannelliFlorini | Florini |
 Joe SawyerLefty | Lefty |
 Elisha Cook Jr.Eugene | Eugene |
 Warren HymerIra Eyler | Ira Eyler |
 Robert KentRonnie Brewster | Ronnie Brewster |
 Sarah PaddenMom Palooka | Mom Palooka |
| JJoe LouisHimself | Himself |
 Sam McDanielSmoky | Smoky |
 J. Farrell MacDonaldLong-Count Bowman | Long-Count Bowman |
 Betty BlytheMrs. Stafford | Mrs. Stafford |
 Carol HughesMrs. Van Pragg | Mrs. Van Pragg |
 Eddie GribbonLouie, the Louisiana Lion | Louie, the Louisiana Lion |
| MManuel Ángeles OrtizManuel Ortiz | Manuel Ortiz |
| HHenry ArmstrongHenry Armstrong | Henry Armstrong |
 Jo Ann MarloweRosie Palooka | Rosie Palooka |
| JJimmy McLarninJimmy McLarnin | Jimmy McLarnin |
 Roger DanielRoger Daniel | Roger Daniel |
| LLou NovaAl Costa | Al Costa |
 Michael MarkHerman (Pop) Palooka | Herman (Pop) Palooka |
| CCeferino GarcíaCeferino Garcia | Ceferino Garcia |
| JJack RoperWaldo, the Wyoming Wildcat | Waldo, the Wyoming Wildcat |
 Dave WillockMr. Rodney | Mr. Rodney |
 Sam HayesRadio Announcer | Radio Announcer |
 Philip Van ZandtFreddie Wells | Freddie Wells |
 John KellySammy | Sammy |
 Emmett VoganFight Commissioner | Fight Commissioner |
 Carole DonneMrs. Oberlander | Mrs. Oberlander |
