Tommy McCoy grew up poor and scrappy. As a young man he discovers that he can fight with his powerful right arm. He becomes successful at boxing, however he has an alcoholic father.
| Actor | Role |
|---|---|
 Mickey RooneyTommy McCoy / Killer McCoy | Tommy McCoy / Killer McCoy |
 Brian DonlevyJim Caighn | Jim Caighn |
 Ann BlythSheila Carrson | Sheila Carrson |
 James DunnBrian McCoy | Brian McCoy |
 Tom TullyCecil Y. Walsh | Cecil Y. Walsh |
 Sam LeveneHappy | Happy |
 Walter SandeBill Thorne | Bill Thorne |
 Mickey KnoxJohnny Martin | Johnny Martin |
 James BellFather Patrick Ryan | Father Patrick Ryan |
 Gloria HoldenMrs. Laura McCoy | Mrs. Laura McCoy |
 Bob SteeleSailor Graves | Sailor Graves |
 Frank MayoMan at Bar (uncredited) | Man at Bar (uncredited) |
 Milburn StoneHenchman (uncredited) | Henchman (uncredited) |
 Shelley WintersWaitress / Autograph Hound (uncredited) | Waitress / Autograph Hound (uncredited) |
 John GeorgeMan at Gym (uncredited) | Man at Gym (uncredited) |
 Douglas CroftDanny Burns, Newsboy | Danny Burns, Newsboy |
 Eve MarchMrs. Martin | Mrs. Martin |
 David ClarkePete Mariola | Pete Mariola |
 June StoreyArlene | Arlene |
| EEric RobertsJoe | Joe |