Matthew Vaughn Director, Screenwriter, Producer Colin Firth Harry Hart Actor Michael Caine Arthur Actor Taron Egerton Gary "Eggsy" Unwin Actor Samuel L. Jackson Richmond Valentine Actor Mark Strong Merlin Actor Sofia Boutella Gazelle Actor Sophie Cookson Roxy Actor Jack Davenport Lancelot Actor Mark Hamill James Arnold Actor Jane Goldman Screenwriter David Reid Producer Adam Bohling Producer Mark Millar Executive Producer Dave Gibbons Executive Producer Stephen Marks Executive Producer Claudia Schiffer Executive Producer Pierre Lagrange Executive Producer George Richmond Cinematographer Eddie Hamilton Film Editing Jon Harris Film Editing Henry Jackman Original Music Matthew Margeson Original Music Paul Kirby Production Design Andy Thompson Supervising Art Direction Jennifer Williams Set Decoration David Morison Set Decoration Arianne Phillips Costume Design Reg Poerscout-Edgerton Casting