Speaking to SFX magazine in the latest issue, out today, Moffat hinted: “I wrote it as the friction version. When you’re talking to yourself there are no limitations, there’s no holding back. You wouldn’t be kind or courteous. At the same time, because they are two loveable, madcap, caffeinated Doctors, they’re also quite fanboyish about each other. They think it’s quite cool.”

He explained: “They’re not broody, upset Doctors – it’s more “There’s two of us! Brilliant!” But that’s mostly in the playing, because they were having such a good time together that they brought that out. They get giggly with each other. It is, by lovely accident, a tremendous double-act. They’re naturally funny together. Enough alike and enough dissimilar. Matt said it was like Laurel and Laurel, as if Hardy didn’t show up – except he does in the form of John Hurt!”

The showrunner added: “The weird thing is there’s never that much contrast between Doctors. The truth is it’s not wildly different how they’re written. I’ve written quite a lot for both of them, and you just have the voice in your head, very clearly. Where they are similar is funny, because they’re practically in unison, and where they are different is David is a cheeky, sexy, genuinely cool Doctor, up against a Doctor who thinks he’s sexy and cool but is woefully wrong on that subject! And that’s just naturally funny.”

Moffat has also revealed that the special “changes the way [the Doctor] thinks and the way he will adventure from now on”.

‘The Day of the Doctor’ will air on Saturday 23 November simultaneously across six continents and at least 75 countries at the same time as the UK broadcast on BBC One.

> Find out all the latest info on ‘The Day of the Doctor’ in our news summary.

[Source: Doctor Who TV]

What do you think the dynamic between Matt Smith and David Tennant’s Doctors will be like? Let us know below…

> Order the 50th anniversary special on DVD on Amazon.

> Order the 50th anniversary special on Blu-ray on Amazon.

Watch the 50th anniversary trailer…