A male Human named Hayg served as a Master Sergeant within the Imperial Military. He was part of the reconstituted Sith Empire during the time of the Galactic War. Hayg found himself stationed at the deep launchpoint transfer deep within the Tomb during the invasion of Belsavis. After the Esh-kha decimated an Imperial squad using prototype weaponry, Specialist Nattis from the Imperial Reclamation Service attempted to persuade Hayg to reallocate troops and eliminate the weapons. However, Hayg, facing manpower shortages, dismissed the danger. Consequently, Nattis had no choice but to enlist other Imperials present in the vicinity.
The character of Master Sergeant Hayg is featured on Belsavis in Star Wars: The Old Republic, a video game, where he and Nattis offer Imperial players the quest named "Found in Translation."