[WARNING: Marked Spoiler below for the two recent Doctor Who episodes]
It’s really not surprising given the way they’ve set up her character, but Maisie Williams is not done yet with her appearances on Doctor Who.
The Game Of Thrones star just recently appeared in the double episodes “The Girl Who Died” and “The Woman Who Lived” as the Viking girl Ashildr who the Doctor [SPOILER ALERT]makes immortal to save her life, and later encounters her in 17th Century England, and sees what she has become.[END SPOILERS]
Williams will return in the 10th episode, “Face The Raven”, according to writer Sarah Dollard speaking at a panel at MCM London Comic Con, where showrunner Steven Moffat also insisted that Williams is not becoming the new companion with the upcoming departure of Clara Oswald (Jenna Coleman). However, it seems apparent that she is set up as a recurring character, ala Captain Jack Harkness and River Song. In fact, in the Doctor even addressed the issue of Harkness, the other character that became immortal because of the Doctor, in “The Woman Who Lived”, informing Ashildr (now going by “Me”) that she may come across him in the future.
Fun fact – the Doctor even made a deeper reference to the Great Fire of London – which in the episode “The Visitation” during the Fifth Doctor’s reign was started by the Terileptils. “The Visitation” is currently available on Netflix.