Uther's daughter Morgana returns from banishment and poisons her father. Merlin arrives too late to save the king but gets Uther to acknowledge his illegitimate son on his deathbed. Merlin takes the boy to the ruined citadel of Camelot.
Morgan invites Arthur and his regiment of soldiers over for an evening's entertainment and an overnight stay. During this time, she sets up a series of intrigues and hoaxes.