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Doctor Who - The Invisible Enemy (1)
Seizoen: 15 - Aflevering: 5 / 460 - Eerst uitgezonden: 01 oktober 1977 - Episode ID: 75536
Deep space, 5000AD. An Earth supply shuttle is infected by a strange sentient space-borne virus, which quickly spreads to the crew of the refuelling station on the moon Titan. Even worse, the Doctor himself falls victim. But why is Leela immune, and what is the virus's ultimate goal?