Kingsley Ben-Adir

Malcolm X

Eli Goree

Cassius Clay

Aldis Hodge

Jim Brown

Leslie Odom Jr.

Sam Cooke

Joaquina Kalukango

Betty X

Nicolette Robinson

Barbara Cooke

Michael Imperioli

Angelo Dundee

Lawrence Gilliard Jr.

Bundini Brown

Christian Magby

Jamaal

Jeremy Pope

Jackie Wilson

Christopher Gorham

Johnny Carson

Beau Bridges

Mr. Carlton

Lance Reddick

Brother Kareem

Derek Roberts

Jerome X

Emily Bridges

Emily Carlton

Amondre D. Jackson

L.C. Cooke

Jerome A. Wilson

Elijah Muhammad

Hunter Burke

Jess Rand

Robert Stevens Wayne

Jules Podell

Randall Newsome

Myron Cohen

Matt Fowler

Ronnie

Chris Game

Ferdie Pacheco

Alan Wells

Ed McMahon

Dustin Lewis

Miami Announcer

John Curran

Wembley Announcer #1

Mark Allan Stewart

Wembley Announcer #2

Amar Khalil

Bobby

Ian Alexander Desdune II

Michael

Jeremy Anderson

Lamont 3X

Pierce Lackey

Reporter 1

Dave Pileggi

Reporter 2

Ashley LeConte Campbell

Karen

Kimberly B Brown

Geraldine Liston

Nola Epps

Attallah Shabazz

Kipori Woods

Cliff White

Joshua Nylan Tanner

Boston Ballroom Announcer

Sean Monaghan

Henry 'The Hammer' Cooper

Aaron D. Alexander

Sonny Liston

Jason Ament

Miami Referee

Nathan Siebring

Wembley Referee

Kevin Reid

Cameraman

Cody Johnson

Tristen

Rachael Knaps

Boxing Match Attendee (uncredited)