The Visitation: Part Four 1982
7.5 243 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.
Runtime: 24
Starts: Peter Davison, Matthew Waterhouse, Janet Fielding, Sarah Sutton
Director: Peter Moffatt