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In the conclusion of the six-part story "The Seeds of Doom," the power of the intelligent, voracious Krynoid plants has spread throughout the British countryside. The Doctor (Tom Baker) enlists the aid of the RAF in wiping out the Krynoid menace before plants all over the world arise to destroy mankind. This was the final story to feature the Doctor's UNIT colleagues until the 1989 continuity Battlefield. Written by Robin Banks Stewart, "The Seeds of Doom, Part 5" first aired on March 6, 1976, as the final episode of Doctor Who's 13th season.