Sonny Liston
Geraldine Liston
Ceasar Novak
Farah
Savino
Father Alios
Nico Orso
Bobby Zazo
Muhammad Ali / Cassius Clay
Floyd Patterson
Police Chief Greensburg
Bill Macky
Bishop Knight
Officer Mellow
St. Louis Cop
Catfish Jenkins
Plainsclothes Cop #1
Plainsclothes Cop #2
Young Sonny
Announcer Trent Mays
Announcer
Bookie
Man #1
Toby Liston
Referee #1
Referee #2
Referee #3 (as Peter E. Wylie)
Referee #4
Officer Buck
Young Fan #1
Young Fan #2
jailed Boxer (as Raymond Olubawale)
Irish Assassin
Girl fan
Cigarette Girl (uncredited)
Lewiston Ring Girl (uncredited)
(uncredited)
Irish Thunder (uncredited)
Fan (uncredited)