Champ
Erik Kernan Jr.
Joyce Kernan
Teddy Kernan
Ralph Metz
Polly
Andrea Flak
Perlmutter
Marciano
Whitley
Bob Satterfield Jr.
Ike Epstein
Kenny
Jaws
Runt
Tillman (as Steve Strachan)
Washburn
Reporter #1
Roselle (as J.W. Carroll)
Crony
Police Officer #1
Police Officer #2 (as Sean Olsen)
Hood
Jenny
Jeremy
Little Girl
Teacher
Teenage Boy
McCracken
Young Champ
Store Manager
John Elway
Announcer
Wealthy Man
Woman with Kenny
Champ's Cornerman
Newsroom Editor
Toby Eagleburger
Female in Newsroom
Elway's Manager
50's Referee
Office Helper
Minister (as Pastor Alfred Rampersand)
Jake Plummer
Jake LaMotta (voice)
Young Marciano
Quarterman
Erik 'The Wow Man' Kernan Sr. (voice)
Boxer
Montage Boxer #1
Montage Boxer #2
Montage Boxer #3
Montage Boxer #4
Montage Boxer #5
Montage Boxer #6
Amber (scenes deleted)
Ezzard Charles (archive footage) (uncredited)
Showtime Assistant (uncredited)
Audience (uncredited)
Boxer Extra (uncredited)
Supporting Artist (uncredited)
Corner man in boxing ring (uncredited)