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