Camelot faces a new golden age, but even as the city flowers, the dark seeds of destruction are being sown. In the frozen wastelands of the north, men are disappearing without a trace. King Arthur and his knights undertake a dangerous mission into the unknown in search of answers - but once there, Merlin finds himself locked in a battle unlike any he has fought before.
Elenco: Colin Morgan , Bradley James , Angel Coulby , Katie McGrath , John Hurt , Richard Wilson , Eoin Macken , Katie McGrath , Richard Wilson , Rupert Young , Santiago Cabrera , Tom Hopper .