Gundo was a male Mirialan who served as a lieutenant in the Republic Army's Eighty-sixth Infantry during the Cold War and Galactic War with the resurgent Sith Empire. By 3642 BBY, Gundo was stationed at a research facility on the planet Quesh alongside the Jedi Padawan and former Dark Council member Sajar. When Quesh was invaded and the facility attacked by Imperial forces, Gundo led his detachment in the defense of the facility, with the help of the Jedi Knight known as the Hero of Tython, to prevent the Imperial Military from capturing Sajar.