On returning to the role he first played in 1989, Marcus Gilbert said: "Bumping into Angela is always good. She's a wonderful lady, and I'm so happy to see her. It's the character development as well, after so many years – it's a whole other dimension, which gives us a lot to do and a lot to enjoy."

Producer Alfie Shaw said: "The series has been building to Ancelyn ever since it started and it's great to end my run on UNIT by bringing him back. Script editor Rob Valentine and I knew when we were planning the two sets that we had to finish with this.

"Brave New World has resisted bringing in returning elements while the characters and the world were bedded in, but we couldn’t hold off on this forever. The dynamic between Ancelyn and Bambera is one of the highlights of Battlefield, and it’s been a blast reuniting them.

"Knightfall follows on directly from Fractures, with the two sets essentially forming one really bad week for UNIT. It started with a Kaiju attack and now they’ve been thrown into the midst of an inter-dimensional Cold War. We finally go to the Albion referenced in Battlefield and explore how it's changed after losing both Arthur and Merlin."

Angela Bruce © Liam Daysh-Holmes

Marcus Gilbert © Liam Daysh-Holmes

Genevieve Gaunt © Liam Daysh-Holmes