There are no two greater fanbases than those of "Doctor Who" and "Sherlock" -- two of the most popular shows on BBC -- and they also happen to share the same showrunner/head honcho, Steven Moffat.

Fans of both have longed for a crossover between the two TV universes; there's even a video imagining this on YouTube called "Wholock," which has over 3 million views. (Check out the video below.)

Among the fans of the "Wholock" crossover? Turns out, Moffat himself has entertained the idea a few times.

At a Q&A during the "Doctor Who" premiere in Cardiff, Moffat -- when asked about the possibility of doing the crossover -- said "look, I’m going to come clean on this: I would," which most likely sent every fan everywhere into a frenzy.

But alas, Moffat followed it up by saying it's probably not going to happen, then blamed his actors for the soul-crushing disappointment.

"Go speak to Benedict Cumberbatch, Martin Freeman, Mark Gatiss and Sue Vertue, okay?" Moffat said, probably knowing full well that most of the fans can't actually just go up to these people and talk to them on a regular basis. "They're all in the way. I'm not the killjoy, it's that lot. It’s probably not going to happen.”

Way to throw your cast under the bus, Moffat! But the famed showrunner did then express his own reservations about the crossover, even if it was on his radar.

“You know in some ways, I think Mark [Gatiss] has got a point when he says that however good you imagine [the crossover], it would be almost better in your imagination than it would be if the two grand old egotists actually met," Moffat said, referring of course to Holmes and the titular Doctor. "They'd just both go off in opposite corners and sulk that there was someone cleverer than them.”

A 90-minute episode of the Doctor and Sherlock sulking in corners? Sounds good to us!