Originally Posted by Ulsterguy:
“Ahh, like 'The Deadly Assassin' was a single hander for Tom Baker. After posting that I heard a trailer for series 9 on Radio 2 in which I think I heard a line spoken by Capaldi which ran along the lines of 'An invitation to all of me'. A possible nod to the inclusion of another Doctor as mentioned above? It is after all the 10th anniversary of the new series. I wonder if 'Face the Raven', being broadcast on November 21st would feature a multiple doctor story?”
The Deadly Assassin was a story where The Doctor had no companion, but it's not a single-hander. A single-hander is an episode where literally there's only one actor in the whole thing... nobody else, at least nobody identifiable. If you look at the cast credits for
Heaven Sent (the Series 9 episode in question), no matter how many characters are in it, it'll simply say Peter Capaldi, Peter Capaldi and Peter Capaldi.
If I understand correctly, Eastenders did a single-hander a few years back with their Dot Branning character.
As for talk of a returning Doctor, I really hope not. I want a series where we just have the Doctor "as is" rather than back and forthing. I wasn't a huge fan of the idea for the 50th Annivesary (hi, misery guts over here

) but more beyond that is just... meh. Especially when the likely returnee would be Tennant...again... I wasn't fussed about him when he was in the role, let alone after it. All just personal opinion of course, but I don't see him cropping up in Series 9.