Stanley

Charlie Hunnam

Walter 'Lion' Kaminski

Jack O'Connell

Pepper

Jonathan Majors

Sky

Jessica Barden

Buck Noble

Fran Kranz

Yates

John Cullum

Clay Carlson

Nick Mullen

Meadows

Owen Burke

Darlene

Meredith Holzman

Old Senior

Ken Cheeseman

Kind Father

Michael Tow

Stepfather McGinty

Jere Shea

Reggie

Johnno Wilson

Lefty Denunzio

Patrick M. Walsh

Roman

Lucien Spelman

Clem

Naheem Garcia

Lefty's Buddy (uncredited)

David Torres Jr.

Zeus

Bill Thorpe

Mother McGinty

Margaret Devine

Burly Father

Frank Ridley

Bartender

Michael Stanton

Waitress

Wendy Overly

Pepper's Head Thug (uncredited)

Manny Jagroop

Bus Driver

Moira Driscoll

Pepper's Crew

Christopher Michael Cagle

Boxing Trainer (credit only)

Keith Kozlin

Referee

Ed LaVache

Boxing Coach

Kyle Cusick

Fight Spectator

Bob Mendell

Train Patron (uncredited)

Thomas J Berry

Pepper's Crew (uncredited)

Christopher Cagle

Amtrak Employee (uncredited)

Christina Calvao

Fight Attendant

Ronald Cabral

Diner Waitress (uncredited)

Ellen Collins

San Francisco Police Officer

Guy Cooper

College Girl (uncredited)

Jamie Ghazarian

Boxing Patron (uncredited)

Jed Griswold

Bar Patron (uncredited)

Tony Ionno

San Francisco Chinatown Cop (uncredited)

Dawayne Jordan

Bus Traveler

Gwen MacKay

Joey (uncredited)

Joseph Oliveira

Fight Guest

Brooke Arcadio Navarro

San Francisco Police Detective (uncredited)

Mel Powell

San Francisco Detective (uncredited)

Billy Silvia

Bus Patron

Russell J. Ramos

Clay's Frat Brother

Daniel Shealy

College Kid (uncredited)

Bobby Garrafa

Lefty's Entourage

Bruce Soscia

Detective

Bruce Spears