The clock is well and truly ticking. The long-awaited next episode of Doctor Who, The Waters Of Mars, is showing in just four days time, and to say that it's been worth the wait would be a massive understatement on our part.

We don't buy what the Radio Times is saying, that it's the scariest Doctor Who episode ever. But we do think, having had the pleasure of sitting through it the other week, that it's one of the very darkest. This is the kind of Doctor Who that Russell T Davies was criticised for some time for not writing, and yet, in conjunction with Phil Ford, he's delivered and then some with The Waters Of Mars. It's a super episode.

Ahead of the broadcast, the BBC has released another collection of images from the show, which we're happy to bring you here. The usual gallery drill applies: click on the one you want to make it much bigger.

And we'll be building up to Waters Of Mars even more in the days ahead...