Don 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

Dan Tobey

Fight Announcer

James J. Casino

Boxer (uncredited)

Ned Roberts

Fighter (uncredited)

Jimmy Martin

Fight Second

Chester Clute

Timid Man

Jack Perry

Trainer (uncredited)

John Breen

Fight Spectoator (uncredited)

Noble 'Kid' Chissell

Fight Spectator (uncredited)

Bobby Henshaw

Fight Spectator (uncredited)

Charles Morton

Fight Spectator (uncredited)

Sol Murgi

Fight Spectator (uncredited)

Stanley Price

Fight Spectator (uncredited)

Mark Plant

Gangster

Harvey Parry

Bit Role (uncredited)

Al Bain

Fight Spectator (uncredited)