The Winter King

An intriguing season premiere. King Uther banishes his son Arthur. Arthur rescues a boy named Derfel, whom he entrusts to Merlin.

An untimely death leads Merlin to locate Arthur and urge him to come back to Britain. Chaos ensues when Gundleus assaults Avalon.

Arthur takes Gundleus prisoner. Nimue struggles with the trauma of her rape and plans to kill Gundleus. Arthur learns that Gundleus' uncle Gorfydd is preparing for war.

Nimue returns to Avalon, where she is found by Merlin. Derfel and Owain travel to collect taxes from King Cadwys. Gundleus returns to Caer Cadarn.

Derfel feels uncomfortable about the attack on the mine. Nimue is discovered by Merlin, who helps to heal her. Tristan arrives demanding retribution, but Owain denies his guilt.

Arthur and the tribe kings enter peace talks. Arthur meets Guinevere, Ceinwyn's lady-in-waiting, while travelling.