Following the twists and turns of The Day of the Doctor this past weekend, it seems that Doctor Who boss Steven Moffat has more surprises in store for fans of the show.

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According to the showrunner, Matt Smith isn’t the 11th Doctor, as previously thought, but rather the 13th, meaning that he will soon pop his clogs.That’s because according to show lore, The Doctor can only regenerate 12 times. John Hurt’s ‘War Doctor’ is apparently now cannon, and David Tennant used up a regeneration in the episode Journey’s End.According to The Mirror , Smith will even utter the line “I’m dying and there’s nothing I can do about it” in the forthcoming festive episode.But all is not lost – Peter Capaldi has already been cast as the next Doctor, though Moffat isn’t saying how that’s possible.“The 12 regenerations limit is a central part of Doctor Who mythology,” he told The Mirror . “Science fiction is all about rules, you can’t just casually break them. So if the Doctor can never change again, what’s Peter Capaldi doing in the Christmas special?”So any ideas? Let us know in the comments below, and check out IGN’s review of The Day of the Doctor here

Chris Tilly is the Entertainment Editor for IGN in the UK and finds this all rather confusing. He can be found talking nonsense on both Twitter and MyIGN