Even though a lot of fans want a crossover between "Sherlock" and "Doctor Who" to happen, show runner Steven Moffat said that this is unlikely, and he has a very good reason why it should not happen.
"That's a question that I get asked so often, and I can't keep answering it," he told Collider. "It's all right for 'Doctor Who.' That's fine. But it would change Sherlock's life, if he met the Doctor and knew that time travel was possible. He'd have to factor that into every crime he solved. And do we really think that Sherlock Holmes lived through a Dalek invasion? I don't think he did. I think he'd have mentioned it by now. It's not going to happen. That's just the truth of it."
However, Moffat cannot deny that the thought of two brilliant minds feeding off of each other would be a wonderful thing - at first. After doing this, they would simply end up trying to outdo each other.
"I suspect it's a bit like when the Doctors meet. It's fantastic, at the beginning, and then you think, 'What the hell am I going to do with three of the (expletive)?' It's just weird. You don't really need more than one person like that in a show," he said.
Fans are really excited for what they have cooked up for the "Sherlock" Christmas special, but Moffat mulled that it shouldn't actually be called a Christmas special because the episode would actually fit in any time of the year.
It is a Christmas-ish special. It will be around that time of year. I'm not being vague because I'm evil. I just don't know. It won't be Christmas day 'cause that's too crowded now, but it will be somewhere around that period. So, it's a sort of Christmas special.
"We keep calling it the Christmas special, and there's a Christmas-y element in it, but it's not really. You could put it in the middle of summer and it would be fine," he said.
Moffat added that it actually feels right that their show only has three episodes per season, then a Christian special after each season.
:Because of the strange nature of our show, which wasn't particularly intentional - it's just the way it worked out - we do three, every so often, with long gaps. Somehow it feels more right just to have a one-off special, sitting by itself and unconnected," he mulled. "Sherlock never feels like it just comes back for that year. It re-enters the stadium with a big blast for a very, very short time, and then buggers off again. In its weird rock star preening, it feels right."