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[Doctor Who] How do the Doctor's enemies keep track of which Doctor is which?
(self.asksciencefiction)
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With the Daleks, I suppose you could say that they've studied the Time Lords well enough to detect the, oh I dunno, chrono-telomeres or whatever that actually determine whether or not a Time Lord has any regenerations left. shrugs
I mean two hearts would do it in most cases. Or just DNA actually.
This would most likely be the in universe answer. Some techno babble said extremely fast that you never hear again for 50 years.