Once Upon a Time casts its Merlin, Guinevere, and Percival 

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is fleshing out its take on Arthurian legend with the casting of three new roles.

) has been cast as Merlin, Joana Metrass (

 previously revealed that Liam Garrigan is set to to play King Arthur in season 5, during which executive producers Adam Horrowitz and Edward Kitsis promised they’ll put their “own twist on Camelot, on Arthur’s background and on his relationships with Merlin, Guinevere and Lancelot.”

, check out our exclusive look at Emma’s transformation into the Dark One and read the show’s producers answer your burning questions. 

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