Morgana Pendragon, also known as Morgana, is the main antagonist of the BBC series, Merlin. She is the illegitimate 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. She is Merlin's former friend turned arch-nemesis. She was portrayed by Katie McGrath, who also played Lena Luthor in Supergirl.