3. Maisie Williams
It looks like
Doctor Who is on a mission to capitalise on the success of
Game of Thrones in Series 9 as it's enlisted the dramatic services of one of the latter's most prominent rising stars, Maisie Williams. There she is in the GIF above being totally badass with a knife (and there's
plenty more where that came from!) in her role as headstrong tomboy Arya Stark and her upcoming involvement in
Doctor Who has already sent the speculative minds of the show's fandom into overdrive. All they've been told thus far is that she'll be playing a cryptic character "who will challenge the Doctor in unexpected ways", which sounds pretty game-changing in itself. The obvious theory that she's a younger version of Clara Oswald has already blossomed into the realms of unattainable inconceivability - surprise, surprise - but the Doctor can seemingly never have too many enigmatic women in his life so it's about time he got us scratching our heads once more with another ongoing mystery wrapped in an enigma. She's probably River Song anyway, let's be honest. Just putting it out there.