CS-227 served as a stormtrooper of the First Order, assigned to the Colossus platform located on Castilon in the time leading up to the Hosnian Cataclysm. Following the sinking of the station by members of the Resistance, he, along with two other stormtroopers, were assigned to guard the station's control room. CS-227 and the other troopers confirmed that the station's reactors were still unresponsive, as reported, hindering efforts to resurface the platform. When a Chelidae maintenance worker lingered outside the control room in the hallway, CS-227 exited to compel the worker to depart, but was instead ambushed and rendered unconscious by Kazuda Xiono and Neeku Vozo. As his two trooper companions ventured out to investigate, they were ambushed, and CS-227's unconscious form was hurled at them, enabling Xiono, Vozo, and their allies to enter the main control room. The Chelidae then removed the bodies of CS-227 and his two fellow troopers from the area.