After Morgana's determination threatens not only Arthur's future, but also the very balance of the world, Merlin faces his toughest challenge yet. Hellish creatures end up emerging killing everyone that they touch. With Uther a shadow of his former self, Arthur and his loyal knights, including Lancelot are forced to try and protect the kingdom.
Merlin is a young warlock who arrives in the kingdom of Camelot after his mother arranges for him to stay with the court physician, Gaius. He discovers that the king, Uther Pendragon, has outlawed magic and imprisoned the last great dragon deep under the kingdom.
The dragon tells Merlin that he plays an important role: to protect Uther's son, Arthur, who will bring forth a great kingdom. When Merlin meets Arthur, he believes that he is arrogant and Arthur, likewise, views Merlin as subservient. Merlin must keep his magic secret or face being executed by Uther.
Merlin - The Darkest Hour - Part 1 Synopsis and Schedule