Gizor Dellso was a Geonosian engineer who worked for the Confederacy of Independent Systems during the Clone Wars against the Galactic Republic. Years before the war began, he helped design a command signal that would shut down the Trade Federation's droid army to prevent anyone from ever using their droids against them. At war's end, this same signal was ultimately used to deactivate the defeated Separatist Droid Army. Although the Republic triumphed over the Separatists in the Clone Wars, Dellso refused to surrender. On the planet Mustafar, he reactivated a hidden droid factory near a former Separatist mining facility and began building his own private droid army, hoping to restart the war. However, the Imperial 501st Legion was sent to Mustafar to eliminate Dellso and end his rebellion, resulting in the fugitive Geonosian's death and the destruction of the droid factory.