The designation Scout Undead Trooper referred to Imperial scout troopers who had been infected with "the Sickness," a viral agent responsible for transforming deceased individuals into ravenous, unthinking walking corpses referred to as Undead Troopers, driven by cannibalistic desires. Despite their undead condition, the Scout Undead Trooper retained the capacity for rapid movement and could inflict damage on buildings.
These Scout Undead Troopers were involved in an outbreak that posed a significant risk of spreading throughout the galaxy. However, thanks to the combined actions of both the Galactic Empire and the Alliance to Restore the Republic, both the initial infection and a subsequent outbreak were successfully brought under control.