Leon Errol

Knobby Walsh

Joe Kirkwood Jr.

Joe Palooka

Elyse Knox

Anne Howe

Eduardo Ciannelli

Florini

Joe Sawyer

Lefty

Elisha Cook Jr.

Eugene

Warren Hymer

Ira Eyler

Robert Kent

Ronnie Brewster

Sarah Padden

Mom Palooka

Joe Louis

Himself

Sam McDaniel

Smoky

J. Farrell MacDonald

Long-Count Bowman

Betty Blythe

Mrs. Stafford

Carol Hughes

Mrs. Van Pragg

Eddie Gribbon

Louie, the Louisiana Lion

Manuel Ángeles Ortiz

Manuel Ortiz

Henry Armstrong

Henry Armstrong

Jo Ann Marlowe

Rosie Palooka

Jimmy McLarnin

Jimmy McLarnin

Roger Daniel

Roger Daniel

Lou Nova

Al Costa

Michael Mark

Herman (Pop) Palooka

Ceferino García

Ceferino Garcia

Jack Roper

Waldo, the Wyoming Wildcat

Dave Willock

Mr. Rodney

Sam Hayes

Radio Announcer

Philip Van Zandt

Freddie Wells

John Kelly

Sammy

Emmett Vogan

Fight Commissioner

Carole Donne

Mrs. Oberlander

Russ Vincent

Curly