The 12 regenerations limit is a central part of Doctor Who mythology. So if the Doctor can never change again, what's Peter Capaldi doing in the Christmas special?
is that he's dismissing the theory? I don't seem to recall him having said ANYWHERE that Matt is the "final" incarnation, either.
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Yes, it's always bad.
Like a serial killer promising not to cut you up into chunks and have sex with the chunks really really really.
And then he goes and does it anyway...
Really, I've only myself to blame.