Steven Moffatt may be down with it – and Opinionated Geek JM Wong has LOTS of issues with his writing – but Mark Gatiss says a Sherlock Doctor Who crossover would only happen “over my dead body”.

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Gatiss, who plays Mycroft Holmes on Sherlock, co-created the 21st century incarnation of the world’s greatest detective with Moffatt, and is also a writer on Doctor Who. But despite the regular baying on the Internet for a crossover, Gatiss just doesn’t “see the point”:

“First of all, they are entirely different shows. But I think there’d be so much excitement among certain members of the fan community followed by massive disappointment that it wasn’t the version they had in their heads. And, just personally, I’ve never been [a] fan of these kind of mash-ups.”

But Moffat, the leader writer on Doctor Who, loves the idea of a Sherlock Doctor Who crossover, even if his collaborators don’t: “I’d do it, ‘cause it’d be funny. It’d just be a laugh. But the rest of them, frankly, the grownups — ‘No, you can have too much sugar.'”

We have to agree with Gatiss on this – the idea of Benedict Cumberbatch and Peter Capaldi sparring might be fun at first, but it would inevitably turn into a very, very fan servicey kinda thing.

As it is, as far as I’m concerned, both are outstanding characters who should just stay put in their own universes – but that’s just me, of course.

What do YOU think, geeks? Should a Sherlock Doctor Who crossover ever happen?