One of the biggest on going issues I have with Steven Moffat's time as show runner on Doctor Who (and more so in these last couple years than in the beginning) is the insistence on providing answers to questions that weren't asked, and solving mysteries that aren't mysteries.
I use this as a preface to the above interview with Steven Moffat on Nerd Cubed. It's a half hour long, and contains much that is fun and enjoyable, but there is a bit where they begin discussing the fact that Dozenth Doctor Peter Capaldi has appeared in universe twice already, once in the Fires of Pompeii, and again in the best role and performance from Torchwood: Children of Earth. And instead of just ignoring this fact and allowing the suspension of disbelief to carry the viewer through, he said:
"I’ll let you in on this. I remember Russell [T. Davies, former showrunner] told me he had a big old plan as to why there were two Peter Capaldis in the Who universe, one in Pompeii and one in Torchwood. When I cast Peter, he got in touch to say how pleased he was I said 'Okay, what was your theory and does it still work?' and he said 'Yes it does, here it is'."Actors appearing on the series multiple times is nothing new. Nicholas Courtney appeared in a first Doctor serial before joining the show as the Brigadier, Sixth Doctor Colin Baker showed up as an entirely different Time Lord in a Fourth Doctor episode, recent companions Freema Agyeman and Karen Gillan both had roles before they stepped on board the TARDIS, the list goes on and on. After 50 years, you shouldn't expect any less. There isn't a need to introduce unnecessary reasoning behind things that don't need to be explained. That way lies only plot holes and narrative gymnastics that threaten to alienate the viewers. That, and you've already dealt with this exact premise with the most recent companion, and that story turned out to be a great load of shite.
Just leave it alone, write good episodes that don't fold over on themselves like a Möbius strip, and let Capaldi be impressive, as he no doubt will be.
Via Den of Geek.