| Directed by | |
|---|---|
 | Morgan Matthews |
| Starring | ||
|---|---|---|
| Asa Butterfield | Nathan Ellis | |
| Rafe Spall | Martin Humphreys | |
| Sally Hawkins | Julie Ellis | |
| Eddie Marsan | Richard | |
| Jo Yang | Zhang Mei | |
| Martin McCann | Michael Ellis | |
| Jake Davies | Luke Shelton | |
| Alex Lawther | Isaac Cooper | |
| Alexa Davies | Rebecca Dunn | |
| Orion Lee | Deng Laoshi | |
| Edward Baker-Close | Nathan Ellis (9 yrs) | |
| Percelle Ascott | Ben Morgan | |
| Suraj Rattu | Pav Kamdar | |
| Jamie Ballard | Headmaster | |
| Clare Burt | Doctor | |
| Adam Foster | Paediatrician | |
| Lee Zhuo Zhao | Li Jing | |
| Shannon Beer | Caz | |
| Tasha Connor | Jessie | |
| Lawrence Jeffries | Schoolboy 1 | |
| Ciaran Wakefield | Schoolboy 2 | |
| Song-Hung Chang | Employee | |
| Bo-Han Huang | Luke's Buddy | |
| Joseph Barnes | Canadian Maths Student 2 | |
| Karl Ng | Mei Ping Wu | |
| Lewis Adams | Smoking School Pupil | |
| Jessica Arden | Alla (Russian IMO Team) | |
| Lee Bolton | Multiple sclerosis patient | |
| Jason Thomas Brown | Indian IMO Contestant | |
| Leo Chell | Family member | |
| Colin Coombs | MS Sufferer in Meeting | |
| Paul J. Dove | John | |
| James Frost | Multiple Sclerosis Sufferer | |
| Joseph Myers | UK Team Assistant | |
| Mick Slaney | Parent | |
| Patricia Winker | Invigilator | |
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UK release date: 13th March 2015
Ireland release date: 13th March 2015
Hong Kong release date: 19th March 2015 New Zealand release date: 26th March 2015
Thailand release date: 26th March 2015
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