Maisie Williams won't shed her battle-ready demeanor when she jumps from Westeros to the TARDIS.

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The Game of Thrones star is currently filming for Doctor Who's "The Girl Who Died" and "The Woman Who Lived" and, while details about her character have remained under wraps, new set photos show her donning a Zorro mask as she raids an 18 the century stagecoach in the dead of night (see photos here).

Even the best highwaymen are no match for the Doctor (Peter Capaldi), however. While s wealthy and daintily dressed couple appear as William's marks, snaps from Express reveal that the stagecoach will have another, less human occupant. Twelve will materialize on the scene as William's character rides in on horseback, pistol drawn.

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It seems the young Brit will play a villain of sorts, but there is a chance she may find herself aiding everyone's favorite time traveler.

"It's not possible to say too much about who or what she's playing, but she is going to challenge the Doctor in very unexpected ways," showrunner Steven Moffat teased. "This time he might just be out of his depth, and we know Maisie is going to give him exactly the right sort of hell."

Find out more when Doctor Who returns to the BBC and BBC America this fall. Click the video below to see Williams in Game of Thrones.