Steven Moffat might not be my favorite showrunner, but I’m still one to give credit where it’s due; the dude has just made a very smart move. As announced today by the executive producer and BBC America, the adorable and delightful Maisie Williams will guest star on Doctor Who, series 9. Williams probably only has another year or so commitment to Game of Thrones’ (depending upon how long they take to wrap up things), and as Arya Stark, she’s just about to hit her biggest storyline this season. Already fantastically popular, Williams is only going to become more well-known, so Moffat’s timing is pretty perfect:

“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.”

While it might not be prudent for Moff to give us any clues as to Williams’ role, the news is of course, nothing if not fodder for our speculation, and if he’s got even half a brain, there are already plans to make number 1 happen. In very particular order, here’s our guesses for what Maisie’s guest role might entail:

3. She’s The Master’s (Missy) Apprentice.

What’s a good villain without an evil apprentice, or at least a wannabe? We know Michelle Gomez’s Missy is set to return in series 9; she’s confirmed at the very least for the two-part opening episode: “The Magician’s Apprentice/The Witch’s Familiar.” Mmmhmm. Oh, and Williams and Gomez bear enough resemblance to each other that they could easily play mother an daughter; wouldn’t that make for a fine twisty tail tale?

2. She’s Being Set Up As a Future Companion.

As Jenna Coleman barely just decided to go another round, we expect series 9 to be Clara’s last, so why not set up a casual meeting with the Doctor’s future companion? Capaldi’s Twelve bumps into Williams’ mystery character now — a little magic happens — and after Clara’s gone, the Doctor’s next travel partner suddenly pops up again.

1. It’s a Test Run to See If She’d Like to Be the First Female Doctoooor!

COME ON. Without even a millisecond’s thought necessary, we know Williams would make a perfect Doctor. And can’t you already imagine all Moffat’s self-congratulatory back-patting, as if he’d come up with the female doctor idea all by himself? Still, it’d be a win-win situation, and we’ll happily take the news any way we can get it. Let’s get this campaign going right now.

As for the actress, she’s nearly as thrilled as we are:

“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.”

Also announced today were two more series 9 episode titles: “‘The Girl Who Died” and “The Woman Who Lived,” as well as guest stars Rufus Hound, Tom Stourton, Ariyon Bakare, Simon Lipkin, Ian Conningham, Murray McArthur, Barnaby Kay, John Voce, and Struan Rodger.

Cindy Davis, (Twitter) is practically giddy over the possibilites.