We’ve known for a while that Michelle Gomez’s Missy (couldn’t quite call her the *spoiler* now, could we) will be back in Doctor Who‘s Season 9.

So seeing her in the latest Doctor Who trailer, which debuted at the San Diego Comic-Con panel, wasn’t as much of a surprise as the last shot…

Which shows none other than Arya Stark coming face to face at last with the man who murdered her… Wait, wrong show.

Yes, Maisie Williams is in the trailer, and although her role isn’t revealed, the line she says leaves us guessing…

Clearly, she’s someone the Doctor (Peter Capaldi) knows of.

Could she be another regeneration of Missy? Maybe?

A student of Clara Oswald’s (Jenna Coleman)? She’s the right age.

Or maybe she’s a regenerated Jenny, the Doctor’s daughter from Season 4 (who incidentally was played by Georgia Moffett, the Fifth Doctor’s real life daughter, who also happens to be married to the Tenth Doctor, David Tennant, with whom she has a daughter, who played the Doctor’s daughter in a BBC Red Nose Day Doctor Who spoof) .

Or perhaps she’s a Faceless Man using Arya’s face to complete a contract for the Many-Faced God. Valar morghulis, Time Lord.

Admittedly, I was kinda hoping she’d go “Hello, sweetie”, but that would’ve been too obvious.

BBC’s Doctor Who returns for Season 9 on Sept 19.

Who will Maisie Williams play in Doctor Who? Let us know!