Producer Emma Haigh said: “Writers Guy Adams and Matt Fitton have created an epic story for the Seventh Doctor – they’ve brought many of his companions together, along with several nemeses, which lead to a great melting pot of action and adventure.

“We are taken on quite a journey through the worlds of the Seventh Doctor, seeing our companions challenged to their limits and some making the ultimate sacrifice. Buckle up, it’s going to be quite a ride!”

Co-writer Matt Fitton said: “The whole story of The Last Day is the natural progression of the Seventh Doctor's journey. As he gets older, he just sees there's so much to fix – there's so much to do, so much danger to fight.

“He has begun to wonder, ‘Is there a way to just get everything right, once and for all, so I can rest and sit back? A way to be certain I've done my job?’ So, The Last Day is about him trying to reach that position.

“The setting of it all, without giving anything away, gave us the premise of The Last Day and allowed us to play with other versions of reality and universes. So, we’ve got a version of Ace who can interact with characters in a different way to how we’d normally expect her to. It brings alternative dynamics to them all.

“Each of the companions brings their own strengths, and there are varied reasons as to why the Doctor chose to travel with them. That all comes to the fore here when they become part of the team that’s assembled during the course of the story.”

Co-writer Guy Adams added: “Once we had decided this was going to be the big send off for the Seventh Doctor, the obvious thing to do was look at the cross-section if you cut through the trunk of the Seventh Doctor stories. We worked our way through all the best bits and tried to find what and who might be achievable, and who would add something to it as a character, because that’s always a consideration.

“It was quite easy to include a shopping list across two whole box sets, as this is, but I hope we were quite fastidious in our conversations to try and make sure that everyone has their space.”

Sylvester McCoy, Edward Peel, Sophie Aldred

Bonnie Langford, Sylvester McCoy, Lisa Bowerman

Lisa,-Bonnie,-Sophie

Maggie-and-Amy

Matt Fitton, Maggie O'Neill, Emma Haigh, Amy Louise Pemberton, Sylvester McCoy, Sophie Aldred, Lizzie Annis, Dan Starkey, Sam Clemens

Wayne Forester, Travis Oliver, Sylvester McCoy, Alex Jordan, Dan Starkey