The BBC has released the official story synopsis for the second episode of Doctor Who‘s new season.

Written by showrunner Steven Moffat, ‘The Witch’s Familiar’ will air on Saturday 26 September on BBC One.

The synopsis reads: “Trapped and alone in a terrifying Dalek city, the Doctor is at the heart of an evil Empire; no sonic, no TARDIS, nobody to help.

“With his greatest temptation before him, can the Doctor resist? And will there be mercy?”

The episode is the second part of a two-part story, following ‘The Magician’s Apprentice’ on Saturday 19 September.

The full guest cast for the story is listed as Michelle Gomez, Jemma Redgrave, Kelly Hunter, Clare Higgins, Jaye Griffiths, Harki Bhambra, Daniel Hoffmann-Gill, Joey Price, Aaron Neil, India Ria Amarteifio, Dasharn Anderson, Demi Papaminas, Jami Reid-Quarrell, Benjamin Cawley, Stefan Adegbola, Shin-Fei Chen, Lucy Newman-Williams, Barnaby Edwards, Nicholas Pegg and Jonathon Ojinnaka.

Steven Moffat has described the two-part story which opens Season 9 as “a big, grand, movie-sized story.”

> Buy Season 8 on DVD on Amazon.

> Buy Season 8 on Blu-ray on Amazon.

Season 9 has been filming in Cardiff since January.

> Here’s everything we know about Season 9 so far.

Are you looking forward to ‘The Witch’s Familiar’? Let us know below…