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In a distant galaxy, in the 42nd century, the Doctor and Martha face a desperate race against time to save themselves and the crew trapped on board an out-of-control spaceship that is hurtling towards a boiling sun.

The Doctor and his assistant only have 42 minutes to prevent a catastrophe. But with their task being made all the more difficult by the work of saboteurs and a mysterious force starting to possess the ship’s crew, time is rapidly running out…

Former EastEnders actress Michelle Collins guest stars as McDonnell.