Briton - during the Dark Ages. King Uther Pendragon is a capable and well-regarded king who rules a land that is constantly at war - defending borders and negotiating tenuous alliances with bloodthirsty warlords. His daughter Morgan whom he banished from the kingdom 15 years earlier, unexpectedly arrives at his Castle Pendragon seeking her father’s forgiveness. Uther, an unyielding man, denies her repentance and strikes her in anger. That night, Morgan, versed in the dark arts of wizardry, shape-shifts into the form of a scullery girl and poisons her father. Merlin, the King’s own wizard, arrives too late to prevent the poisoning, but elicits from Uther on his deathbed a royal order that his legitimate but publicly unknown son, Arthur must succeed the King and return greatness to the Castle Camelot.
Paramount on Arthur’s list of enemies is his own half-sister, Morgan, who, intending to claim her father’s crown, installs herself in Castle Pendragon and forms an allegiance with a sworn enemy of Uther, King Lot. Morgan’s escalating anger and efforts to destroy Arthur through her dark powers become a focal point in both of their character arcs and story.