Following an emergency landing, the TARDIS arrives on a remote world orbiting a peculiar star – a pulsar which exerts an enormous gravitational force, strong enough to warp time.
On further exploration the Doctor and his friends, Jamie and Zoe, discover a human outpost on the planet’s surface, inhabited by scientists who are there to study an ancient city. The city is apparently abandoned, but the scientists are at a loss to explain what happened to its sophisticated alien architects. The Doctor discovers that something dark, silent and deadly is also present on the world – and it is slowly closing in on the human intruders...
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