WARNING: This synopsis contains some mild spoilers some may want to avoid.
The BBC have released a synopsis for episode ten of Series 9, Face the Raven, penned by Sarah Dollard. You can read the synopsis below, which also confirms the return of a character:
The Doctor and Clara, with their old friend Rigsy, find themselves in a magical alien world, hidden on a street in the heart of London.
Sheltered within are some of the most fearsome creatures of the universe… and Ashildr (Maisie Williams)! With a death sentence hanging over their heads, not all of the intruders will get out alive.
Face the Raven airs on Saturday 21st November on BBC One, with the time to be confirmed later this week.