Nabu was a star system located in the Alpha or Beta Quadrants. It contained a large asteroid belt and at least one inhabited planet which was home to a humanoid race.

In 2266, the USS Enterprise was exploring the system when they discovered strange glowing asteroids. Investigating, they discovered an electromagnetic field surrounding it. Captain James T. Kirk led a landing party to the surface and discovered a group of convicted criminals led by Targu. (TOS comic: "The Devil's Isle of Space")

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