Dylan O'Brien

Thomas

Kaya Scodelario

Teresa Agnes

Thomas Brodie-Sangster

Newt

Giancarlo Esposito

Jorge

Ki Hong Lee

Minho

Dexter Darden

Frypan

Rosa Salazar

Brenda

Patricia Clarkson

Ava Paige

Aidan Gillen

Janson

Barry Pepper

Vince

Nathalie Emmanuel

Harriet

Alexander Flores

Winston

Jacob Lofland

Aris Jones

Lili Taylor

Mary Cooper

Alan Tudyk

Blondie

Terry Dale Parks

Carl (Masked Man)

Kathryn Smith-McGlynn

Dr. Crawford

Matthew T. Metzler

Barkley

Jenny Gabrielle

Ponytail

David House

Soldier

Lora Martinez-Cunningham

Thomas' Mother

Luke Gallegos

Young Thomas

Shawn Prince

David

Jeremy Becerra

Riley

Matthew Page

Harold (Soldier)

Alex Knight

Aide

Marc Comstock

Med Tech

John Trejo

M3 Soldier

Katherine McNamara

Sonya

Tatanka Means

Joe

Ryan Jason Cook

Nurse

James Burnett

Rebel Sentry

Morse Bicknell

Doctor

Adriana Acosta

Glader (uncredited)

Brian Barela

Bunker Soldier (uncredited)

Laramie Cooley

Abigail (uncredited)

Jetto Dorsainville

WCKD / Bunker Militia (uncredited)

Andrea Good

Ash People (uncredited)

Carma Harvey

Scavenger (uncredited)

Gary Hood

Glader (uncredited)

Keith Jardine

Scavenger Guard (Jim) (uncredited)

Jess King

WCKD Soldier (uncredited)

Martin Palmer

Rave Party Guest (uncredited)

Frank Powers

Soldier (uncredited)

Ben Pronsky

Additional Voices (voice) (uncredited)

James Tyler Robinson

Glader (uncredited)

Gonzalo Robles

Hazmat Soldier (uncredited)

Bryce Romero

Jack (uncredited)

Diego Romero

Scavenger Guard (uncredited)

J. Nathan Simmons

Ash Mob Evacuee (uncredited)

Kaelee Vigil

Civilian (uncredited)

Alexander Wagenman

Kid on Train (uncredited)

Richard Daniel Williams

Right Arm Militia (uncredited)

John Christian Love

Surveillance Room Attendant

Kelly V. Lucio

Glader / Rescued Glader (uncredited)