Speaking about her casting, she said:
I can't believe I'm actually going to be in an episode of Doctor Who! Especially as it all came about from a chance meeting. I was playing a gig and got chatting to the show's production team who'd been watching my performance. I was telling them how much I loved Doctor Who and next thing they invited me to be on it. I couldn't think of a better place to make my acting debut than on one of the UK's most iconic shows!
Lead writer Steven Moffat said:
We are completely thrilled that the amazingly talented Foxes is joining us on board ... well, you'll see. Let's just say, the Doctor is finally catching up on his phone calls.
The singer took time off from her UK tour for her album Glorious to undertake filming yesterday; she will also be performing a track for the series.