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