'Doctor Who': Steven Moffat Teases Maisie Williams' Role in Season 9

Maisie Williams Doctor Who Tardis Season 9

There isn't much that fans love more than a good crossover, where two of their favorite properties merge, resulting in something unexpected and awesome. Failing that, fans can also dig when an actor from one incredibly popular show turns up another hit genre show, as will be the case when Game of Thrones' Maisie Williams guest stars on next season of Doctor Who.

Williams will appear in two episodes of Doctor Who season 9 - “The Girl Who Died” and “The Woman Who Lived” - however, the details of her role remain a mystery. The first image shared of Williams on set was merely a publicity shot and didn't hint much at her character. Then she showed up in the Doctor Who Season 9 trailer during its post-logo stinger in a quick scene that implied the Doctor knows her character, and that he knows she's trouble.

There has since been rabid speculation over just who Williams is playing, and given the hint of familiarity between her and the Doctor, many theories - including a few of our own - have suggested her character is perhaps a young Missy, the Doctor's artificially progenerated daughter Jenny, or even his actual granddaughter, Susan Foreman. But during BBC America's presentation at the TCAs, Doctor Who executive producer Steven Moffat put many of these theories to rest by insisting that Williams' role is not a returning character.

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