Morgana Pendragon, also known as Morgana, is the tritagonist-turned-main antagonist on the BBC series, Merlin. She is the daughter of Uther Pendragon and the half-sister of Arthur Pendragon and Morgause. Initially being an innocent ward of Uther who had spoken out against his actions on those who practice sorcery, she eventually discovered she had magic. At the start of Season 3 onwards, she became the main antagonist of the series. She was portrayed by the Irish actress, Katie McGrath.