Back up to: Season 19
4/4 The Doctor must follow the Master back to 20th century Heathrow.
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3/4 From within their sarcophagus, the gestalt Xeraphin are communicating through Nyssa.
2/4 After an encounter with the Plasmatons, Nyssa is possessed by strange aliens.
1/4 Concorde disappears back through a crack in time, so the Doctor follows its trail.