This article covers a subject that has been deemed non-canon by either the author or the Star Wars licensees, and thus should not be taken as a part of the "real" Star Wars universe.
Ego was an Imperial officer who was stationed at an Imperial garrison on Cilpar and held the rank of Major in 4 ABY. When Vance Rego, a Cilpari Resistance fighter who was spying for the Empire, learned where the Rebel Alliance operative "Targeter" was hiding, he informed his handlers, who dispatched Major Ego and a group of stormtroopers to assist him in capturing Targeter. Major Ego and a group of stormtroopers took an injured Wes Janson and the operative Winter—who, at the time, they believed to be PrincessLeia Organa—into custody and transported them to their headquarters at Kiidan.