Reparto (por orden de créditos)
Johnny Addie
Self - Ring Announcer
Muhammad Ali
Self
Jimmy Braddock
Self - Guest
Drew Bundini Brown
George Chuvalo
Billy Daniels
Angelo Dundee
Self - Trainer
Steve Ellis
Self - Ringside Commentator
Robert Goulet
Sonny Liston
Joe Louis
Rocky Marciano
Floyd Patterson
Willie Pep
Sandy Saddler
Jack Sharkey
José Torres
Jersey Joe Walcott
Self - Referee