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| Lewis MacDougall | Conor | |
| Sigourney Weaver | Grandma | |
| Felicity Jones | Mum | |
| Toby Kebbell | Dad | |
| Ben Moor | Mr. Clark | |
| James Melville | Harry | |
| Oliver Steer | Sully | |
| Dominic Boyle | Anton | |
| Jennifer Lim | Miss Kwan | |
| Max Gabbay | Steven | |
| Morgan Symes | Lawyer | |
| Max Golds | 5-Year-Old Connor | |
| Frida Palsson | Lily's Mum | |
| Wanda Opalinska | Female Nurse | |
| Patrick Taggart | Teacher | |
| Lily-Rose Aslandogdu | Lily | |
| Geraldine Chaplin | The Head Teacher | |
| Liam Neeson | The Monster | |
| Kai Arnthal | Student | |
| Lee Bolton | Rollercoster Rider |
| Director |
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| Producer |
Belén Atienza
Alvaro Augustin Ghislain Barrois Sandra Hermida |
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| Writer |
Patrick Ness
Siobhan Dowd |
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| Cinematography |
Óscar Faura
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| Musician |
Fernando Velazquez
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A boy imagines a monster that helps him deal with his difficult life and see the world in a different way. |
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