On screen
Cast
22 credited performers
Lewis MacDougall
Conor
Sigourney Weaver
Grandma
Felicity Jones
Mum
Toby Kebbell
Dad
Ben Moor
Mr. Clark
James Melville
Harry
Artwork unavailable
Oliver Steer
Sully
Dominic Boyle
Anton
Jennifer Lim
Miss Kwan
Artwork unavailable
Max Gabbay
Steven
Artwork unavailable
Joe Curtis
Peter
Morgan Symes
Lawyer
Artwork unavailable
Max Golds
5-Year-Old Connor
Frida Palsson
Lily's Mum
Wanda Opalinska
Female Nurse
Artwork unavailable
Patrick Taggart
Teacher
Lily-Rose Aslandogdu
Lily
Liam Neeson
The Monster (voice)
Geraldine Chaplin
The Head Teacher (uncredited)
Jake Talbot
Rollercoaster Boy (uncredited)
Artwork unavailable
Lee Bolton
Rollercoster Rider (uncredited)
Artwork unavailable
Garry Marriott
Paramedic (uncredited)