Get ready for a dark, exciting drama with the Doctor threatened by a water-based menace on the Red Planet? And when we last left him, he was travelling alone. The Time Lord who once delighted in sharing the wonders of the universe was once again the 'lonely angel'. But judging from what we already know of the story, he won't have long to worry about loneliness. There will be action, danger... and an awful lot of running! As seen on ABC1.