Johnny Capps Creator Julian Jones Creator, Writer Jake Michie Creator Julian Murphy Creator Colin Morgan Merlin Actor Bradley James Arthur Pendragon Actor Richard Wilson Gauis Actor Angel Coulby Gwen Actor Katie McGrath Morgana Actor John Hurt The Great Dragon Voice Stephen McCole Ragnor Guest Star Sophie Rundle Sefa Guest Star Josette Simon The Euchdag Guest Voice Eoin Macken Sir Gwaine Guest Star Liam Cunningham Ruadan Guest Star Rupert Young Sir Leon Guest Star Tomiwa Edun Sir Elyan Guest Star Tom Hopper Sir Percival Guest Star Justin Molotnikov Director