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Steed pays a visit to some friends at their country estate, only to discover that the house has been taken over by enemy agents, and the homeowners are being held prisoner. It soon develops that an important peace conference is scheduled to be held next door. Despite the villains' heavy aritillery, Steed plans to prevent them from sabotaging the conference. One of the series' few "serious" entries, "Take-Over" was written by Terry Nation; the episode debuted in America on April 14, 1969, and was shown in England nine days later.