Doctor Who showrunner Steven Moffat has addressed some confusion following events in The Time of the Doctor.
In the latest Doctor Who Magazine a reader asks that if the Doctor in fact prevented his own death how could his tomb be there in The Name of the Doctor?
Moffat replied: “I’ve often wondered about that. Fortunately, late one night, the Doctor turned up in person and explained it to me:
“THE DOCTOR: Changing time is tricky. It’s a bit like a detective story: so as long there isn’t an actual body, you’ve got a certain amount of wiggle room – for instance, if the body has, rather conveniently, been burned on a boat in Utah.
“Here’s the thing: I can change the future so long as the future has not already been established as part of my own past. I can’t rescue Amy and Rory because I already know that I didn’t.
“But what do I know about Trenzalore? There’s a big monument that looks very like my TARDIS. There’s a temporal fissure leading to my timeline. Maybe it’s my grave. Maybe, one day, it’s my burial ground. Maybe it is something else entirely, and we got it all wrong. Don’t know. Don’t plan to find out for as long as possible. The main thing is, Clara still jumped into my time stream, and ended up helping me through all of my life. All that is established, unchanged – but there’s wiggle room!”
Last year Moffat told Blogtor Who: “…in normal circumstances he might have gone back and said, ‘look we’ll just put a headstone up and we’ll just write the book’. But there is so much scar tissue, and the number of paradoxes that have already been inflicted on that nexus of timelines, that it will rip apart if you try to do one more thing. He has to leave it alone.”
He also added “When I was first talking to Karen and Arthur about it, we said ‘let’s make it the proper ending’. Bringing back things just gives you sequel-itis. Just end it and get out.”