Peter Capaldi’s Doctor is going to have his hands full, according to Deadline. Maisie Williams, best known as Game Of Throne’s stabby tween-on-the-run Arya Stark, is currently filming an appearance for the upcoming season of Doctor Who. Since this is just a guest turn, we shouldn’t assume that William’s Who gig means that Arya is doomed to be hurled onto spikes, shot full of crossbow bolts, covered in pitch and set alight, or torn apart by a starved pack of Braavosi street urchins on Game Of Thrones this season. Instead, we assume she’ll just be decapitated, since that’s what happens to everyone in Westeros eventually.

While the role is unspecified, Williams excels on Thrones as a free spirit who doesn’t appreciate being bossed around. Capaldi’s Doctor, meanwhile, is a curmudgeonly alien who is constantly bossing everyone around, so it doesn’t take a Time Lord to predict the tone of their relationship. Moffat confirms a tempestuous dynamic, saying, “[Williams] 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.” That would be the Seven Hells, specifically.

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In other Who news, episode titles have been revealed for a pair of period tales: The Girl Who Died and The Woman Who Lived, which may or may not be referring to Jenna Coleman, who is set to return as the Doctor’s companion Clara Oswald. The next season of Doctor Who will air this fall; in the meantime, Williams will be busy sticking people with the pointy end of her sword when Game Of Thrones returns to HBO on April 12.