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Maisie Williams is going from the Seven Kingdoms to the Tardis.

The young actress, who is set to reprise her role as Arya Stark on Game of Thrones Season 5, has booked a top secret role on Doctor Who Season 9.

Details on the part are being kept under wraps, but BBC America did release the following photo of Williams on the show’s iconic set:

The Hollywood Gossip

“I’m so excited to be working on Doctor Who as it’s such a big and important part of British Culture," the star said via statement. "I can’t wait to meet the cast and crew and start filming, especially as we’ll be shooting not too far from my home town.”

Executive Producer Steven Moffat, meanwhile, teased that Williams will play some kind of foil to Peter Capaldi’s famous time traveler.

"We’re thrilled to have Maisie Williams joining us on Doctor Who. 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," he said, adding:

"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."

New episodes of Doctor Who will air this fall (you can always watch Doctor Who online in the meantime), while Game of Thrones returns to HBO on Sunday, April 12.