Winter is coming on Doctor Who.

'Doctor Who' Cast Spotted Filming Episode 5 [PHOTOS], What Is Peter Capaldi Up To?

The Time Lord will get a visit from Game of Thrones' Maisie Williams in season 9, and it looks like the young actress' new character will raise Cain just as well as Arya Stark (see video below).

"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."

Mark Gatiss Teases 'Scary' 'Doctor Who' Episode, Will It Be A Two-Parter?

Williams will appear in Jamie Mathieson and Moffat's "The Girl Who Died" and Catherine Tregenna's "The Woman Who Lived." It is currently unknown when the in the season fans will get to see Williams but it looks like the two episodes will become another two-part episode.

The upcoming episodes will also feature Rufus Hound, Tom Stourton, Ariyon Bakare, Simon Lipkin, Ian Conningham, Murray McArthur, Barnaby Kay, John Voce, and Struan Rodger.

Find out more when Doctor Who returns to the BBC and BBC America this fall.