本剧根据亚瑟王与魔法师梅林的故事改编,由BBC威尔士电视台与Shine影视公司共同出品。 乌瑟国王的养女莫根娜渐渐发现了自身所蕴藏的强大力量,为了逃避乌瑟屠杀魔法师的暴行而私自去寻求古老宗教的帮助。由于同母异父的姐姐莫高斯的出现,二人便携手共同打击卡美洛王国。梅林(科林·摩根 Colin Morgan 饰)发现了莫根娜的异变,便企图阻止她的行动,为了拯救王国梅林迫不得已用毒药害死莫根娜,在关键时刻,莫高斯把奄奄一息的莫根娜给带走了。多次帮助梅林的巨龙以迫不及待的要求梅林来让它重获自由,终究梅林还是斩断了紧锁巨龙的锁链。巨龙也终究反攻卡美洛王国,最终梅林收服了巨龙成为了降龙者。A treasure chamber is unearthed beneath Camelot, the centre-piece being a glowing blue stone in the sarcophagus lid of Cornelius Sigan. Decades earlier, Sigan was executed for sorcery and died vowing revenge. Greedy Cedric, hearing only of the treasure, comes to Camelot. Learning that Arthur has the one key to the vault, he worms his way into the dim young prince's confidence and steals it, looting the chamber and prying away the stone (which is actually Sigan's wicked soul). Consequently possessed by Sigan's spirit, Cedric takes on his magic powers and animates the castle gargoyles, which terrorize the city. In return for a promise to one day set him free, Merlin acquires extra powers from the Great Dragon and does battle with Cedric, saving Camelot once again. Given what has happened, Uther is more convinced than before that magic is only evil.