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The Invisible Enemy (1)

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?
Aired: Oct 01, 1977 Genre: Drama Action & Adventure Sci-Fi & FantasyCasts: Tom Baker Louise Jameson John LeesonCreated By: Verity Lambert Sydney Newman Donald Wilson C. E. WebberProducers: Derrick Goodwin Dave Martin Bob BakerRating: 2.9 Country: United Kingdom Production: BBC