Best. News. Ever.

"Game of Thrones" and "Doctor Who" have shared plenty of guest stars before -- think the Queen of Thorns in "Crimson Horror" or Viserys and Jojen in "Human Nature" -- but until now, the closest thing we've had to a main "GoT"-er hopping in the TARDIS is the knowledge that Robb Stark's real-life girlfriend, Jenna Coleman, is Peter Capaldi's current companion.

That all changes next year, folks. BBC America announced via release on Monday (March 30) that Arya Stark herself, Maisie Williams, would be taking on a guest role in the upcoming ninth series of "Who."

“We’re thrilled to have Maisie Williams joining us on 'Doctor Who,'" Executive Producer Steven Moffat said. "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.”

Like... Valar Morghulis sort of hell? Unlikely, but either way, the thought of seeing our two favorite badass brunettes, Williams and Coleman, sassing the Doctor at the same time is almost too much for our nerd-loving hearts to handle.

“I'm so excited to be working on 'Doctor Who,' as it’s such a big and important part of British Culture," Williams added in the release. "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.”

Series nine of "Who" won't kick off until the fall of 2015, with an episode called "The Magician's Apprentice." Until then, we have this amazing photo of Arya in the TARDIS to keep us sane: