Story Notes
"The Waters of Mars" is an upcoming special which is due to air "around November-ish". Russell T Davies confirmed it on BBC Breakfast on 7 April 2009, when he came to talk about Planet of the Dead. As of mid-April 2009 a broadcast date has not yet been announced, however Davies said on BBC Breakfast that a "November-ish" date was being considered (previously it had been indicated the special wouldn't air until closer to Christmas 2009). The BBC did not confirm the broadcast date of Planet of the Dead until a week prior to its broadcast; therefore it is assumed a confirmed date for the broadcast of The Waters of Mars won't be made available until late in 2009.
As Lindsay Duncan has been cast as a companion, she is the oldest actor to play a companion since the beginning of the series, although this title will be taken away from her in the next episode when Bernard Cribbins becomes the Doctor's companion.
Russell T Davies has said in Doctor Who Magazine that this will be a very scary episode of Doctor Who, as he described it "nightmarish". Therefore it may be be broadcast on Saturday 31st October, Halloween.
Julie Gardner said on the Easter Doctor Who Confidential that another Your Song is Ending style reference will be made in this episode as well as playing a massive part last 2 specials.
The IMDB.com website have placed on their website that the broadcast date is the 14th November 2009. Whether this is true is yet to be revealed.