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Leo Harris as The Boy Who Never Smiles |
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Owen Teale as Aldous Evans |
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Sophie Thompson as Eleri Evans |
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Sule Rimi as Headmaster |
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Tom Mumford as Father |
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Jennifer Evans as Mother |
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Eliza Teale as Teacher |
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Radhika Aggarwal as Doctor Ramani |
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Millie Burridge as Older Girl #1 |
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Emilia Roach-Rooke as Older Girl #2 |
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Martha Sims as Older Girl #3 |
| Production | David Cormican | Producer |
| Production | Asa Bailey | Producer |
| Production | Shawn Christensen | Executive Producer |
| Production | Damon Russell | Executive Producer |
| Production | Brenden Hubbard | Executive Producer |
| Production | Dwayne Hill | Executive Producer |
| Production | Zane Lackey | Executive Producer |
| Production | Amy Morris | Line Producer |
| Production | Victor Jenkins | Casting Director |
| Crew | Keefa Chan | Cinematography |
| Editing | Laurence Cohen | Editor |
| Sound | Andrea Bellucci | Music |
| Directing | Asa Bailey | Director |
| Writing | Neil Graham | Writer |
| Writing | David Cormican | Writer |
| Production | Mark Tuscano | Associate Producer |
| Production | Laurence Cohen | Associate Producer |
| Production | Anand Ramayya | Executive Producer |
| Production | Marion Cheung | Production Designer |
| Costume & Make-Up | Bi Wen Evans | Makeup Artist |
| Production | Amy Morris | Production Manager |
| Directing | Glen Biseker | Second Assistant Director |
| Directing | Kris Francies | First Assistant Director |
| Directing | Emyr Union | Third Assistant Director |
| Sound | John Butterfield-Elsey | Production Sound Mixer |
| Sound | Austin Coffee | Supervising Sound Editor |
| Sound | James Cooper | Sound |
| Sound | Kenny Donovan | Assistant Sound Designer |
| Sound | Raj Ramayya | Supervising Sound Editor |
| Visual Effects | Asa Bailey | Visual Effects Supervisor |
| Camera | Rowan Holownia | Second Assistant Camera |
| Camera | Josh Kelly Jones | Third Assistant Camera |
| Lighting | Adam Klis | Gaffer |
| Camera | Massimo Salvato | Data Wrangler |
| Camera | Omar Sultan | First Assistant Camera |
| Camera | Rhys Webber | Assistant Camera |
| Production | Seth Mason | Casting Associate |
| Costume & Make-Up | Karina Geddes | Wardrobe Assistant |
| Costume & Make-Up | Karen Tomkins | Wardrobe Designer |
| Editing | Mark Tuscano | Assistant Picture Editor |
| Editing | Kristine Dowler | Online Editor |
| Crew | Randy Shumay | Post-Production Manager |
| Editing | Jack Tunnicliffe | Colorist |
| Production | Ruby Horton | Production Assistant |
| Production | Michael Karam | Production Assistant |
| Art | Mike Brazier | Property Master |
| Art | Amy Brooke-Davies | Props |
| Art | Ren Blews | Art Department Assistant |
| Art | Dylan J. Hayward | Art Department Assistant |