The two-parter episode currently being filmed in Cardiff has been written by Toby Whithouse, produced by Derek Ritchie and directed by Daniel O'Hara.
Showrunner Steven Moffat said:
“An amazing guest cast for a brilliantly creepy two-parter by Toby Whithouse. Peter Capaldi and Jenna Coleman are back in Cardiff, back in the box, and back in action - for one of our scariest adventures yet!”
The Twelfth Doctor, Peter Capaldi, added:
“The adventures begin again for myself and Jenna and I’m delighted to be back filming my second series of Doctor Who.”
Comedian and actor Paul Kaye, best known for playing Thoros of Myr in the third series of Game of Thrones, has joined the show for the episode. Talking about his role, Kaye said:
“As a kid of the 1970s, the two shows you always watched were Top of the Pops and Doctor Who, they were unmissable. I actually wrote a song called ‘Looking for Davros’ in my first punk band and I sang it like a demented Dalek. I got to present TOTP back in the mid ‘90’s and landing this role in Doctor Who completes the dream double.
“Peter is a perfect Doctor and I’m loving every minute of the experience, even the five hours in make-up. What a treat, best 50th birthday present ever!”
The episode boasts an impressive cast list, with guest appearances from Morven Christie, Arsher Ali, Colin McFarlane, Sophie Stone , Zaqi Ismail, Steven Robertson and Neil Fingleton.