A clone commander, Doom served alongside the twin Jedi Masters Tiplar and Tiplee. Doom led a flanking maneuver during the Battle of Ringo Vinda, supported by clone troopers including Fives and Tup. When a seemingly disoriented Tup suddenly shot Tiplar in the back, the momentum of the attack was lost and Anakin Skywalker ordered Doom and his men to retreat.