'Doctor Who' season 9 spoilers: Ashildr returns; Clara leaving soon in episode 10?

Maisie Williams isn't done hanging out (or messing with) the Time Lord. The next episode of "Doctor Who" season 9 titled "Face the Raven" marks the return of the "Game of Thrones" star as the woman with many faces Ashildr, who once again summons the Doctor for a new kind of trouble.

This time, the immortal Viking girl will be seen lounging about with what the synopsis called "the most fearsome creatures of the universe" hatching evil plans and probably drinking good tea in a magical alien world located just beneath one of London's busiest streets.

In this "Doctor Who" season 9 episode, the Doctor will once again work with Rigsy, who has already proven himself capable after helping the Time Lord defeat the Boneless in Bristol. The "pudding brained" graffiti artist once again gets the chance to save the world.

Although the upcoming installment will see two characters return, another is making an exit. In the promo, Clara and the Doctor are seen exchanging their last goodbyes before the former prepared take off either by entering another world or simply tackling an enemy she has no chance of defeating.

Either way, it looks like the next episode of "Doctor Who" season 9 will bid the Time Lord's companion adieu. Months back, fans knew the exit of Clara's essayer Jenna Coleman was coming. What they didn't know then was when it will take place.

At the moment, it is still unclear if this will be the last episode of the series Coleman will appear in. But when that moment comes, there will be the question of whether or not the Time Lord will find another companion and how soon.

Carter Matt points out that Alex Kingston could at least fill the void whether as a big presence as in the series as River Song or a temporary companion. The actress will appear in the show's Christmas special.

"Doctor Who" season 9 episode 10 "Face the Raven" airs Nov. 21 at 9 p.m. ET on BBC America.

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