Cillian is an American drama adventure film directed, written and produced by Karen Gillan. The film takes place in modern times and centers on an lonely boy who always trying to commit suicide after being shunned by his friends and family but start fighting for his future. It stars Tom Holland, Chloë Grace Mortez, Jennifer Lawrence, Erin Cahill, Pat Finn, Ryan McCartan, Victoria Justice, Emma Watson, and Becky G. Lionsgate Films was choose to distributed the film with Warner Bros Pictures and Working Title Films producing it. This also marks the final part before The Darcy Triplets Storiverse.
- Tom Holland as Cillian Darcy/A suicidal boy who is the main protagonist.
- Chloë Grace Mortez as Carrie White/Cillian's love interest.
- Jennifer Lawrence as Mrs Mason/Cillian's gym teacher.
- Erin Cahill as Molly Williams/Cillian's stepmother.
- Pat Finn as Mike Darcy/Cillian's father.
- Emma Watson as Mrs Jones/Cillian's english teacher.
- Becky G as Trini Kwan/Yellow Ranger, a girl who is questioning her sexual orientation.
- Ryan McCartan as Brad Majors/The husband of Janet Weiss.
- McCartan also played as Farley Flavor/Brad's twin brother who's serves as the main antagonist of the film. He is a fast food magnate who took over the town of Denton, USA.
- Victoria Justice as Janet Weiss/The wife of Brad Majors.
- Courtney Cox as Sargent Williams/The secondary antagonist.
- Avan Jogia as Snake/Cillian's best friend who is the Leader of the Gothic Warriors, he will returns in The Last Result episode of Lorcan Darcy's Adventures as the series one's true main antagonist.
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