Buy BBC Audiobooks Ltd Oli Smith - "Doctor Who": The Runaway Train (BBC Audio) online at Amazon (Books) › Price: £6.2

Arriving on Earth in the midst of the American Civil War, the Doctor and Amy must get a posse together to help them retrieve an alien artefact that has fallen into the clutches of the Confederate Army. The terraforming device belongs to the Cei, a race of invaders who plan to use it to turn the planet into a new home world.

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