As The Waters of Mars draws to a close, the tenth Doctor moves one step closer to his demise. Indeed, this is the second instalment of David Tennant's four-part swansong, with the actor set to take his final bow as the Time Lord in the double episode The End of Time, (set to air on the BBC over Christmas) before Matt Smith takes over the role in the New Year.
However, it's not just the audience who understand that the Doctor's days are numbered. He knows it too, with the Time Lord - for the first time - looking nervous, acting indecisively and utterly unsure of himself for much of this episode, his impending doom is playing on his mind.
We begin with the Doctor arriving on Mars, for little more than a spot of sightseeing apparently. But while taking in the scenery he stumbles across a base built by colonists from Earth and learns that the year is 2059, and that the base is Bowie Base One - the first human outpost on Mars. In command is the brilliant but slightly scary Adelaide Brooke (played superbly by Lindsay Duncan), plus an international crew of scientists.
The Doctor is immediately concerned. He realises that he's turned up on the exact day that - according to history - the base is destroyed in a massive nuclear explosion. Before he has a chance to bail, however, Captain Brooke discovers that two crew members have been infected by a mysterious alien life form that causes their skin to crack and water to gush from their bodies.
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