'Merlin': 'A Servant of Two Masters' in pictures
Using dark and deadly magic, Morgana corrupts the boy wizard's mind and sets him a single task - to kill King Arthur! Will anyone notice that something is wrong with Merlin before it's too late? And exactly what part does the elderly Merlin - last glimpsed in episode three - play in proceedings?
> Merlin: 'His Father's Son' recap
Take a look at images from this week's Merlin below:
Copyright: BBC Shine/Nick Briggs