Katie McGrath is an Irish actress. She is best known for playing Morgana in Merlin Lucy Westenra in Dracula. Sarah Bennett in the first season of the Canadian horror series Slasher. And as Lena Luthor on the series Supergirl. Film roles include Lady Thelma Furness in W.E. and Jules Daley in A Princess for Christmas. Zara in Jurassic World and Elsa in King Arthur Legend of the Sword.