In this week’s Merlin – entitled in a Lord Of The Rings stylee, The Legend Of Gedref – impetuous Prince Arthur brings a curse upon Camelot after he kills a unicorn. Sure enough the city goes into freefall and it’s up to him to undo the mistakes he has made. He goes to the mysterious Anhora for advice, but the challenges she sets him aren’t a walk in the park. More like a walk in the forest. It’s on tomorrow night (BBC One, Saturday 29 November, 7.35pm) and there’s a clip after the jump…

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