Johnny Capps Creator Julian Jones Creator, Writer 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 Nathaniel Parker Agravaine Actor James Callis Guest Star Trevor Sellers Guest Star Tom Hopper Guest Star Tomiwa Edun Guest Star Rupert Young Guest Star Eoin Macken Guest Star Alex Pillai Director