George MacKay
Jack Marrowbone
Acting
Anya Taylor-Joy
Allie
Acting
Charlie Heaton
Billy Marrowbone
Acting
Mia Goth
Jane Marrowbone
Acting
Matthew Stagg
Sam Marrowbone
Acting
Nicola Harrison
Rose Marrowbone, Mother
Acting
Kyle Soller
Tom Porter
Acting
Tom Fisher
Simon Fairbairn, Father
Acting
Myra Kathryn Pearse
Molly
Acting
Paul Jesson
Doctor
Acting
Robert Strange
Monster
Acting
Laura Brook
Thelma (uncredited)
Acting
Adam Quintero
Mr. Gouldman (voice) (uncredited)
Acting