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The Visitation (4)

With Tegan and Richard under alien control, and the manor sealed against anyone leaving or entering, it's a question whether or not the Doctor can get to London before the Terileptils release their improved strain of black death upon the world.
Aired: Feb 23, 1982 Genre: Drama Action & Adventure Sci-Fi & FantasyCasts: Peter Davison Janet Fielding Sarah SuttonCreated By: Verity Lambert Sydney Newman Donald Wilson C. E. WebberProducers: Peter Moffatt Eric SawardRating: 3.3 Country: United Kingdom Production: BBC