The true engine of the show, however, is the rivalry between Arthur and his half-sister, Morgan. Eva Green delivers a powerhouse performance as a woman consumed by bitterness and a desire for the throne she believes was stolen from her. Her use of dark magic and psychological warfare provides a sharp contrast to Arthur’s idealistic attempts to build a just society. Through their conflict, Camelot explores the theme of legitimacy: is a ruler defined by their bloodline, their power, or their vision for the people?