Watch FMovies. The son of King Uther Pendragon, Arthur has no idea about his lineage until he pulls Excalibur from its stone sheath. He takes the throne of the kingdom with the help of Merlin, the great sorcerer. King Arthur finds love with Guinevere, but is oblivious to her romance with Lancelot of the Lake. Meanwhile, Arthur’s half-sister Morgana longs for revenge against him and sets up a conspiracy that drives King Arthur to danger.