Sherlock co-creator and Doctor Who writer Mark Gatiss has not ruled out the possibility of a crossover featuring Sherlock Holmes and the Doctor.

However, he was keen to point out that it would likely only be a brief skit for charity.

Gatiss told DNAIndia: “It may be possible to do a crossover for Comic Relief or as a sketch, but that’s it. We should be careful about not giving people everything they want.”

He commented: “I don’t want to be a killjoy or Ebenezer Scrooge, but I don’t see why people are so obsessed with the idea. When I was a kid, I had no desire for TARDIS to appear alongside the Starship Enterprise. I liked them as they were.”

The writer added: “Having said that, I can say that if we did do it, it would disappoint people. Because the image they have in their heads will always be better.”

Doctor Who‘s new season begins filming in Cardiff in January.

> Here’s everything we know about Season 9 so far.

Sherlock‘s one-off special begins filming in January, with Season 4 shooting later in 2015.

> Here’s everything we know about the special and Season 4 so far.

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