Arthur is now acting as king, assisted by his uncle Agravaine, whilst King Uther is a lost soul, broken by his daughter's betrayal. Merlin, Guinevere and Gaius continue to act as Arthur's ever faithful servants, but with another traitor now living in the heart of the castle, it seems each of them must prove their loyalty like never before.
Overview of the movie
Merlin - Season 4 Key
