Cassius Clay / Muhammad Ali
Angelo Dundee
Dr. Ferdie Pacheco
Herbert Muhammad
Payton Jory
Mrs. Fairlie
John the Gardener (as Theodore R. Wilson)
Belinda Ali
Ruby Sanderson
Cassius Clay - Aged 18 (as Phillip 'Chip' McAllister)
Drew 'Bundini' Brown (as Drew 'Bundini' Brown)
Bill McDonald
Cruikshank
Hollis
Malcolm X
Velvet Green
Sonny Liston
Draft Lawyer
Commission Doctor
Cassius Clay Senior
Odessa Clay
Rahaman Ali (as Rahaman Ali)
Howard Bingham (as Howard Bingham)
Colonel
Rahaman
W. Youngblood Muhammad
Ronnie (as Ben Medina)
Carrara
Major
Lloyd Wells
Mr. Curtis
Captain
Bossman Jones
Pat Patterson
Lawyer
Mr. Harry
Gene Kilroy
Hooker
Sponsor's Wife
Commentator
Grocer
Suzie Gomez
Harold Conrad
Doctor
Reporter (as Ray Holland)
Self (archive footage)
Bess (uncredited)
Joe Bugner (archive footage) (uncredited)
Self (archive footage) (uncredited)
White Youth (uncredited)
TV Reporter (uncredited)
Gym Boxer (uncredited)
Reporter (uncredited)
Metro Di (uncredited)
Boxer Hitting Heavy Bag in Gym (uncredited)
Young Man (uncredited)
Reporter 'Can We Quote You' (uncredited)
Child in Crowd (uncredited)
Boxer Hitting Heavy Bag in 5th Street Gym (uncredited)