Theta Cygni XII
Theta Cygni XII was the formerly inhabited twelfth planet in its star system. This planet was in the same section of the galaxy as the Beta Portolan system, Levinius V, Ingraham B, and Deneva.

Between 2067 and 2265, this planet was invaded by flying parasites that came from Levinius V. The civilization on Theta Cygni XII was destroyed in the mass insanity caused by the parasites. The inhabitants transported this parasite over to Ingraham B. ()

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it:Theta Cygni XII
Theta Cygni 12