The end of an epic journey, as two mighty armies wage war across the Earth, with the human race caught in the middle. But as an unstoppable terror emerges from beneath Torchwood, the Doctor faces an even greater dilemma - does saving the world mean the death of Rose Tyler?

The first of two training videos by Ricky Gervais and Steven Merchant for the employees of Microsoft.

The second of two training videos by Ricky Gervais and Steven Merchant for the employees of Microsoft.