Eddie Marsan King Uther Actor Nathaniel Martello-White Merlin Actor Valene Kane Morgan Actor Simon Merrells Gunleus Actor Steven Elder Bedwin Actor Andrew Gower Sansum Actor Stuart Campbell Derfel Cadarn Actor Iain De Caestecker Arthur Pendragon Actor Otto Bathurst Executive Producer, Director Kate Brooke Executive Producer, Writer Kenneth Browning Executive Producer Shelley Browning Executive Producer Julie Gardner Executive Producer Toby Leslie Executive Producer Lachlan MacKinnon Executive Producer Sherry Marsh Executive Producer Jane Tranter Executive Producer Ed Whitmore Executive Producer, Writer Bernard Cornwell Writer Aske Alexander Foss Cinematographer Andy Pryor Casting Farren Blackburn Director Loren Mclaughlan Writer Anu Menon Director Kenneth L. Browning Executive Producer