HX-138 was a female Human shadow stormtrooper of the Galactic Empire. Sometime after 0 BBY she was on the planet Dathomir when the dangerous Blackwing virus escaped containment in the Imperial Research and Prison Facility, killing almost all of the facility's personnel and inmates. The virus then turned them all into undead zombies. She and the other survivors created a makeshift camp in the courtyard of the facility which later became designated as Camp Epsilon.