- Mark Hamill James Arnold
- Colin Firth Harry Hart / Galahad
- Samuel L. Jackson Valentine
- Taron Egerton Gary 'Eggsy' Unwin
- Mark Strong Merlin
- Michael Caine Arthur
- Jack Davenport Lancelot
- Corey Johnson Church Leader
- Sofia Boutella Gazelle
- Lily Travers Lady Sophie
- Sophie Cookson Roxy
- Edward Holcroft Charlie
- Ralph Ineson Policía
- Matt Hookings
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