The British actress will be swapping the fictional land of Westeros for adventures with the Time Lord in the Tardis after scoring a part in the popular U.K. show, which she will film during a break from Game of Thrones.
She says, "I'm so excited to be working on Doctor Who as it's such a big and important part of British culture. 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."
Doctor Who producer Steven Moffat adds, "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. 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."
The sci-fi show will return to U.K. TV in the autumn (15) with Peter Capaldi as the Doctor.