Theta Cygni XII
Type:	Planet
Native Species:	Unnamed intelligent species
Location:	Theta Cygni system

The populated Theta Cygni XII is the twelfth planet in the Theta Cygni system. The planet was infested by neural parasites sometime after their infestation on Levinius V. The infestation devastated the planet's civilization. (TOS: "Operation -- Annihilate!")