Anthony Quinn

Lewis 'Mountain' Rivera

Jackie Gleason

Maish Rennick

Mickey Rooney

Army

Julie Harris

Grace Miller

Stanley Adams

Perelli (as Stan Adams)

Madame Spivy

Ma Greeny

Val Avery

Young fighter's promoter

Herbie Faye

Charlie, the Bartender

Jack Dempsey

Himself

Muhammad Ali

Himself (as Cassius Clay)

Lou Gilbert

Dr. Gilbert

Michael Conrad

Ma Greeny's Thug

Rory Calhoun

Himself

Barney Ross

Willie Pep

Steve Belloise

Hotel Desk Clerk

Abe Simon

Stan Ross

J.J. Ballargeon

Paolo Rosi

Alex Miteff

Gus Lesnevich

Al Bain

Police Officer (uncredited)

William Calhoun

Self - Rivera's wrestling opponent (uncredited)