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Theta Cygni XII

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Theta Cygni XII was the twelfth planet in the Theta Cygni star system. Its native population became extinct at some point between 2067 and 2267 when neural parasites travelling from system to system infected the population. The neural parasites had arrived from Levinius V and reached Ingraham B after ravaging Theta Cygni XII. (TOS episode: "Operation -- Annihilate!")

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