Writing in the latest issue of Doctor Who Magazine, Russell T Davies confirms that the preview of the Christmas special, to be shown on this year's Children in Need programme, will not be the pre-titles sequence, but rather a specially packaged clip from the story. This is because the pre-titles sequence from the story is too plot-heavy to work as a standalone preview.

The title of David Tennant's penultimate episode has still not been revealed, but according to Davies it will be six words long, the longest title yet. Final casting for the final episodes took place as late as October, when what is described as a "wonderful and distinguished" Hollywood actor provided the voice for one of the aliens in the story. The voice will be used in the trail for the Christmas episodes which will air directly after The Waters of Mars.

In the run up to the UK showing of The Waters of Mars, David Tennant has been co-hosting the breakfast programme on Absolute Radio. To celebrate the fact, the station mocked up a TARDIS façade for the front of the station.

In the first programme Tennant announced that he is to auction off his own bed live, which is in is own words "a nasty old bed that's seen some action." All proceeds of the auction will be going to Children in Need.

Tennant will be with the programme for the rest of the week, and a podcast of the first programme can be heard via the Absolute Radio website, along with a photo gallery and a video diary.

With a new episode of Doctor Who just five days away, the programme returns to the cover of Radio Times this week.

The magazine takes a look at the special and contemplates whether The Waters of Mars may be the scariest adventure that the intrepid Time Lord's ever had. Russell T Davies explains just why he's ladled on the fear.

Over the years Doctor Who has featured on the cover of the magazine over forty times; the first time it was accorded this honour was in February 1964. There is a full gallery of the covers on The Radio Times website.

The Waters of Mars will come to Canadian Television on Saturday 19th December when it premiers on SPACE at 9pm ET. This is the same date the special will be shown in the US on BBC America.

The final two specials are expected to be shown over the Christmas holiday.

The Waters of Mars is now scheduled in most of the English speaking world with premiers confirmed in Australia, Canada and the United States, all less than 6 weeks after the special has premièred in the United Kingdom.

TV Tonight blog reports The Waters of Mars will make its Australian debut on the Australian Broadcasting Corporation during the week beginning Sunday 6 December 2009 on ABC1. This follows the ABC 'fast-tracking' the last two Doctor Who specials broadcast in the UK.

TV Tonight also reports that Torchwood: Children of Earth will make its Australian free-to-air debut during the week beginning Sunday 3 January 2010 on ABC2.

Update 8 Nov: TV Tonight has since confirmed that 'The Waters of Mars' will indeed debut on ABC1 on Sunday 6 December 2009 at 7.30pm.

Thanks to TV Tonight.

Following the release of the UK transmission date, BBC America has confirmed The Waters of Mars will air in the US on Saturday December 19 at 9:00pm ET/PT.

Tennant's final two stories will then air over the holiday season as a two-part special. Airdates will be released in early December.

The BBC will release The Waters of Mars and the two-part finale on DVD and Blu-ray on Tuesday, February 2, 2010 both as individual releases and also as part of a 5 disc specials collection including The Next Doctor and Planet of the Dead.

David Tennant today launched The Waters of Mars, which airs on Sunday November 15 at 7pm on BBC One. The episode is the second Doctor Who special to be screened this year, and Tennant will also star in two more shows before bowing out at Christmas.

Tennant said he was excited for new Doctor Matt Smith, saying: "I remember how exciting it was starting out on this kind of a journey and nerve-wracking. I'm jealous that he's going through that now - but it couldn't happen to a nicer chap. I'm looking forward to not knowing what happens next. I'm looking forward to being a viewer again."

Of the special, Tennant said: "The Doctor finds himself in a situation where he knows what the end is. It's all about whether he can un-knit the inevitable. With this particular Time Lord's life coming to an end, if he starts fiddling with the fundamentals of time and space, it might lead to his undoing."



Tennant said: "The Doctor now knows incontrovertibly that he's running from his own demise." He described shooting the final scenes as "emotional" but said that as they were filmed out of sequence, the situation did not get too weepy. The actor said the last line he said as the Doctor was: "'You two, with me, spit spot'... so it was robbed of any epic quality. It was very emotional saying cheerio. Filming the final scene was very, very sad. There's lots of scenes in the final, final story that are very sad and were very sad to play."

Tennant spoke about the big opportunities that arose in killing off the current tenth incarnation of the Doctor, to take the story "to places we've never quite been before". He said: "It allows it to be bigger and more epic and wilder... and sadder."

Tennant said he had originally felt under some pressure in taking on the role, saying: "It means so much to so many people. It meant so much to me." He said the bit he would miss the most was "when the new script comes. That was always such a thrill. It was always surprising." Asked if he felt he was in danger of becoming typecast, Tennant said: "I seem to have managed to do quite a variety of things while I've been doing Doctor Who. I haven't felt that it has been anything other than a positive." The star said he had his own sonic screwdriver which he kept locked up in a "secure location" in case his house was burgled.

On playing the role, he said: "You're not really expected to follow what went before, you're sort of expected to go your own way and mess it up a little bit the Doctor is different each time. You know James Bond is always James Bond and Tarzan is always Tarzan and Sherlock Holmes is always Sherlock Holmes but the Doctor is up to you, it's a blank sheet and you can scribble all over it, it's up to you."

He compared the job to being the United States president, saying: "You always get to be called the Doctor."

At the launch, Executive producer Russell T Davies confirmed The Waters of Mars will be dedicated to former producer Barry Letts. Davies paid tribute to his predecessor saying "He was one of the finest producers of Doctor Who and many programmes.. He used to do the Sunday afternoon classic serials and he actually produced the Jon Pertwee years. And then he cast Tom Baker. He cast Lis Sladen as well. He was an extraordinary figure in Doctor Who history and in pop culture – and he passed away, sadly. So, of course, we wanted to have that tribute to him on screen."

The launch has been covered by BBC News, The Guardian and BBC Newsbeat.

Journalist Ian Wylie has posted the full transcript of the press launch with Tennant and Davies on his blog.

The forthcoming special The Waters of Mars will be broadcast on Sunday 15th November at 7:00pm; the date and time were confirmed by David Tennant during this morning's GMTV.

The press preview for the episode is also due to take place today.

The BBC press office has released details of the forthcoming special The Waters of Mars. The episode is currently unplaced in the schedule, but is expected to be shown in mid November.

The BBC Press Office has published details of the line-up for this year's BBC Children in Need charity appeal, with which Doctor Who has long had an association. This year the programme is once again featured, with what the release describes as "An exclusive preview of the Doctor Who Christmas special." Last year there was a similar preview for the 2008 Christmas special, "The Next Doctor", with the pre-titles sequence for this episode being shown, a month in advance of its broadcast.

This year's Children in Need night takes place on Friday 20th November, broadcasting from 7pm on BBC One.

The National Botanic Garden of Wales will play host to the TARDIS during the Autumn half-term: