Steven Moffat Explains Doctor Who Regenerations
Show's head writer tackles confusing subject of limit to regenerations...
"The Doctor doesn't know off the top of his head [what number he is].
"If you worry about such things, and I do, then I specifically said John Hurt's Doctor doesn't use the title. [Matt Smith's Doctor] is in his 12th body but he's the 11th Doctor, however there is no such character as the 11th Doctor - he's just The Doctor, that's what he calls himself.
"The numbering doesn't matter, except for those lists that you and I have been making for many years. So I've given you the option of not counting John Hurt numerically - he's the War Doctor."
Got it now? Moffat also teased that there could be trouble ahead as the Doctor reaches the limit of 12 regenerations - which was set in 1976's The Deadly Assassin.
"Paul McGann turns into John Hurt so they're not the same incarnation. He used up another regeneration and I expect he'll be in trouble shortly - you can't break rules laid down in The Deadly Assassin."
The BBC's feature length episode was viewed by 10.7m people in the UK - and millions more abroad in a global simulcast.
It easily beat ITV rival The X Factor on Saturday night, which had 8.6m viewers.