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The Tardis picks up a distress call from deep space, but when the Doctor, Bill and Nardole try to answer it, they find themselves trapped on board the space station Chasm Forge.
On further investigation, they discover all but four people on board the facility have been murdered - but the dead are still walking.
Now stranded in a future where oxygen is sold by the breath, and space-suits are valued more highly than their occupants, the time-travellers face a battle for survival against the darkest evil of all.
Sci-fi adventure, starring Peter Capaldi, Pearl Mackie and Matt Lucas.
Cast team for Doctor Who (5/12).
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Broadcasts and Catch Up TV for Doctor Who (5/12).
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Previous broadcasts on TV
Broadcasts in 2017
On BBC Two
20/05/2017 at 01:20
On BBC One
13/05/2017 at 19:15