If you’ve watched both shows, you’ve seen the similarities – not just because of Steven Moffat being in charge of both, but also that you could picture Benedict Cumberbatch as the Doctor playing Sherlock Holmes for fun. So there was the natural question of the possibility of a crossover. But Moffat isn’t amenable to that. In a NY Times interview mostly about the upcoming Doctor Who Christmas special, “A Christmas Carol”, he answers about being asked about the two characters meeting: “I think everyone who’s passing me in the streets is suggesting that at the moment. I think there are problems of doing that, because then you would say that Sherlock Holmes lives in the same world as the Doctor, and there are Daleks and all sorts of things. If a Sherlock Holmes story depends on time travel being impossible, it’s quite hard if he’s a personal friend of the Doctor’s, isn’t it?” All true, but it could work – if the Doctor puts aside the advanced technology and plays along for the adventure. But then, it would be like identical twin Sherlocks solving a mystery…maybe that’s not so good.