Steven Moffat said:
Dame Diana Rigg, Rachael Stirling and a Mark Gatiss script - a combination of talents you could only get in Doctor Who! Frankly, I'm terrified already!
Diana Rigg said:
The first time Rachie and I will be working together is on an episode of “Doctor Who” specially written for us by Mark Gatiss. How lucky is that?
Racheal Stirling said:
What joy. I am looking forward to the madness of Doctor Who enormously. Mark Gatiss has written a gift of a script and an on-screen relationship between Ma and I that is truly delicious. We have never before worked together because the offers have not been tempting, but when such a funny and original script comes through you know the time has come.
Filming starts this week at Roath Lock studios & Bute Town. The story is set in Yorkshire, with the mother and daughter having a dark secret.