Sigourney Weaver

Grandma

Felicity Jones

Mum

Jeff Skoll

Executive Producer

Liam Neeson

The Monster (voice)

Toby Kebbell

Dad

Bill Pohlad

Executive Producer

Geraldine Chaplin

The Head Teacher (uncredited)

Jonathan King

Executive Producer

Patrick Wachsberger

Executive Producer

Mitch Horwits

Executive Producer

Ben Moor

Mr. Clark

Jennifer Lim

Miss Kwan

J. A. Bayona

Director

Sandra Hermida

Executive Producer

Lewis MacDougall

Conor

James Melville

Harry

Oliver Steer

Sully

Dominic Boyle

Anton

Max Gabbay

Steven

Joe Curtis

Peter

Morgan Symes

Lawyer

Max Golds

5-Year-Old Connor

Frida Palsson

Lily's Mum

Wanda Opalinska

Female Nurse

Patrick Taggart

Teacher

Lily-Rose Aslandogdu

Lily

Jake Talbot

Rollercoaster Boy (uncredited)

Lee Bolton

Rollercoster Rider (uncredited)

Garry Marriott

Paramedic (uncredited)

Patrick Ness

Executive Producer

Ghislain Barrois

Executive Producer

Enrique López Lavigne

Executive Producer

Álvaro Augustín

Executive Producer