Johnny Capps Creator Julian Jones Creator Jake Michie Creator Julian Murphy Creator Colin Morgan Merlin Actor Bradley James Arthur Pendragon Actor Anthony Head Uther Pendragon Actor Richard Wilson Gauis Actor Angel Coulby Gwen Actor Katie McGrath Morgana Actor John Hurt The Great Dragon Voice Will Mellor Guest Star Andy Linden Guest Star Nicholas Gasson Guest Star Keith Thorne Guest Star Ed Coleman Guest Star James Hawes Director Howard Overman Writer