Kaya Scodelario
Teresa Agnes
Thomas Brodie-Sangster
Newt
Patricia Clarkson
Ava Paige
Terry Dale Parks
Carl (Masked Man)
Kathryn Smith-McGlynn
Dr. Crawford
Matthew T. Metzler
Barkley
Lora Martinez-Cunningham
Thomas' Mother
Luke Gallegos
Young Thomas
Matthew Page
Harold (Soldier)
James Burnett
Rebel Sentry
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)