The BBC have revealed the synopsis for episode 5 of Series 9 - "The Girl Who Died" - which will air on BBC1 on Saturday 17 October 2015 at a time yet to be confirmed:
Captured by Vikings, the Doctor and Clara must help protect their village from Space Warriors from the future: the Mire. Outnumbered and outgunned, their fate seems inevitable. So why is the Doctor preoccupied with a single Viking girl?
Writer: Jamie MathiesonThe air time for episode 4 - "Before the Flood" - has been confirmed as 8.25pm on BBC1 on Saturday 10 October 2015.
Director: Ed Bazalgette
Producer: Derek Ritchie
Cast: Peter Capaldi and Jenna Coleman