B-7G2 was a droid who was designed for research in the biological sciences, and was deployed on the planet Ziost during the Invasion of Ziost in the Galactic War. B-7G2 and another droid, HMC-10, were evacuated from the planet prior to Vitiate's wiping out of all life on the world, and when they returned to the now-desolate surface, B-7G2 decided to remain behind and conduct research.