VIDEO: Sneak Peek - 'A Lesson in Vengeance' on Syfy's MERLIN (Video Content)

Below, get a sneak peek at tomorrow's episode of the Syfy hit MERLIN. In the episode titled 'A Lesson in Vengeance,' King Arthur is the target of a dangerous assassin - his wife and Queen, Gwynevere. The episode airs Fridays at 10/9c.

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