Zaster was an officer of the Imperial Military who lived during the time of the Galactic Civil War. After the Battle of Yavin, Zaster held the rank of General and commanded the Imperial Second Division on the planet Tatooine. During this time, Zaster was very concerned about the expansion of the criminal group known as the Alkhara Bandits. General Zaster eventually sent an official notice to all Imperial personnel on Tatooine in order to reinforce patrols in the areas concerned by the Bandits' activities.