Minho

Ki Hong Lee

Thomas

Dylan O'Brien

Teresa Agnes

Kaya Scodelario

Newt

Thomas Brodie-Sangster

Jorge

Giancarlo Esposito

Frypan

Dexter Darden

Janson

Aidan Gillen

Vince

Barry Pepper

Winston

Alexander Flores

Brenda

Rosa Salazar

Aris Jones

Jacob Lofland

Mary Cooper

Lili Taylor

Ava Paige

Patricia Clarkson

Harriet

Nathalie Emmanuel

Blondie

Alan Tudyk

Carl (Masked Man)

Terry Dale Parks

Dr. Crawford

Kathryn Smith-McGlynn

Ponytail

Jenny Gabrielle

Soldier

David House

Barkley

Matt Metzler

Thomas' Mother

Lora Martinez-Cunningham

Young Thomas

Luke Gallegos

David

Shawn Prince

Riley

Jeremy Becerra

Med Tech

Marc Comstock

M3 Soldier

John Trejo

Joe

Tatanka Means

Harold (Soldier)

Matthew Page

Aide

Alex Knight

Nurse

Ryan Jason Cook

Rebel Sentry

James Burnett

Doctor

Morse Bicknell

Sonya

Katherine McNamara

WCKD / Bunker Militia (uncredited)

Jetto Dorsainville

Ash People (uncredited)

Andrea Good

Scavenger Guard (Jim) (uncredited)

Keith Jardine

Surveillance Room Attendant

Brandon K. Hampton

Soldier (uncredited)

Frank Powers

Additional Voices (voice) (uncredited)

Ben Pronsky

Glader

Kelly V. Lucio

Glader

Tureygua Inaru

Hazmat Soldier (uncredited)

Gonzalo Robles

Jack (uncredited)

Bryce Romero

Ash Mob Evacuee (uncredited)

J. Nathan Simmons

Civilian (uncredited)

Kaelee Vigil

Kid on Train (uncredited)

Alexander Wagenman