Matt Smith, who of course plays the 11th Doctor in Doctor Who, has admitted that he is "open" to the idea of a Sherlock crossover.
He told Collider that he would be interested to see the show's producers come together, but admitted that Sherlock co-creators Steven Moffat and Mark Gatiss are not so fond of the idea.
He said: "I think Mark and Steven kind of hate the idea of Doctor Who and Sherlock ever meeting,"
He then added: "I'm not averse to it. I'm kind of open. I'm like, yeah [it could work], because I just think they would find each other so remarkable."
In 2010, Steven Moffat claimed that it would be "quite hard" to pull off a Doctor Who / Sherlock crossover but admitted that fan interest in the idea was high, stating that: "everyone who's passing me in the street is suggesting that".
"I think there are problems of doing [a crossover]," he said. "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 [to do it] if he's a personal friend of The Doctor's."
More recently, at the Doctor Who Convention in March, Moffat said that the idea is "something which is probably better in your imagination than reality." and that the two characters would be "pushing each other's lights out over who has the better cheekbones."
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