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Lewis MacDougall - ConorSigourney Weaver - GrandmaFelicity Jones - MumToby Kebbell - DadBen Moor - Mr. ClarkJames Melville - HarryOliver Steer - SullyDominic Boyle - AntonJennifer Lim - Miss KwanMax Gabbay - StevenJoe Curtis - PeterMorgan Symes - LawyerMax Golds - 5-Year-Old ConnorFrida Palsson - Lily's MumWanda Opalinska - Female NursePatrick Taggart - TeacherLily-Rose Aslandogdu - LilyLiam Neeson - The Monster (voice)Geraldine Chaplin - The Head Teacher (uncredited)Jake Talbot - Rollercoaster Boy (uncredited)Lee Bolton - Rollercoster Rider (uncredited)Garry Marriott - Paramedic (uncredited)
Ratings
from TMDB7.3/ 103,680 votes