Don 'Red' Barry

Mike O'Hara, "King Cobra"

Sheila Ryan

Janet 'J.L.' Brannigan

Tom Brown

Joe O'Hara

Joseph Crehan

Oscar Brannigan

John Cason

Tiger Johnson

Tony Canzoneri

Swinger Markham

Joey Adams

Duke Hensel

William Edmunds

Professor Berger

Edit Angold

Mama Berger

Margia Dean

Joy White

Harry Brown

Fight Manager

Lyle Talbot

Radio Announcer

Michael Vallon

Bettor

Sam Flint

Doctor

Frankie Van

Referee

Frank McDonald