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Lewis MacDougall

Conor O'Malley

Sigourney Weaver

Grandma

Felicity Jones

Lizzie O'Malley (Mum)

Toby Kebbell

Dad

Liam Neeson

The Monster (voix)

Ben Moor

Mr. Clark

Frida Palsson

Lily's Mum

Wanda Opalinska

Female Nurse

James Melville

Harry

Oliver Steer

Sully

Dominic Boyle

Anton

Jennifer Lim

Miss Kwan

Max Gabbay

Steven

Joe Curtis

Peter

Morgan Symes

Lawyer

Max Golds

5 Year Old Connor

Patrick Taggart

Teacher

Lily-Rose Aslandogdu

Lily

Geraldine Chaplin

The Head Teacher

Jake Talbot

Rollercoaster Boy

Lee Bolton

Rollercoster Rider

Garry Marriott

Paramedic