In 3643 BBY, during the Sith Lord Darth Angral's personal war against the Galactic Republic amid the Cold War between the Republic and the reconstituted Sith Empire, a skirmish occurred in the Power Guard Cybernetics Lab on the moon Nar Shaddaa. The Sith Lord Sadic, who had seized control of the supersoldier-producing Power Guard Project, learned that a young Jedi Knight was searching for the project, so he relocated the program to another location—but left a small group of Imperial soldiers under Commander Graul to guard the facility, along with several Mark I Power Guards. The soldiers and Power Guards were ultimately no match for the Jedi Knight, who recovered Graul's datapad after the fight and used it to track down the project.
In 3643 BBY, during the Cold War between the Galactic Republic and the Sith Empire, the Sith Lord Darth Angral declared a personal war against the Republic after the death of his son, Tarnis. Using stolen information on the Republic superweapon initiative, Angral dispatched his apprentices to seize control of several Republic superweapon programs. Angral's apprentice, Lord Sadic, was sent to the moon Nar Shaddaa, where the Republic had been developing the Power Guard Enhancement System—a program of cybernetic enhancements and adrenal stimulants that produced supersoldiers. After capturing the Power Guard recruitment center, Sadic learned of the main Power Guard Cybernetics Lab's location in Nar Shaddaa's Red Light Sector, and his forces quickly took control of the facility.
However, when Sadic learned of a young Jedi Knight's arrival at the recruitment center and that the Knight was searching for the cybernetics lab, the Sith ordered his forces to take the project data and equipment to his lab in the prison district of Shadow Town. Sadic left Commander Graul and several Mark I Power Guards to guard the facility, as Graul wanted revenge on the Jedi for the deaths of the Imperials who had been guarding the recruitment center. With the help of the Republic Strategic Information Service, the Republic's intelligence agency, the Jedi Knight and a companion tracked down the lab by damaging power conduits throughout the Red Light Sector in order to determine which building had a separate power source.
Entering the lab, the Knight and a companion dispatched the guards and the two scientists within the facility. When the duo reached Graul in the main chamber, they were greeted by a hologram of Sadic, who applauded the Knight's efforts. Anxious to avenge his men's deaths, Graul activated the three Mark I Power Guards that were still in the lab, and Sadic ended the communication as battle was joined. Though the Power Guards were equipped with advanced armor and weapons, Graul and the Power Guards were unable to defeat the Knight and the Jedi's companion, who killed the officer and dispatched the droid-like supersoldiers.
After the fighting ended, the Knight searched Graul's body and discovered an encrypted datapad, though the rest of the facility yielded no clues as to Sadic's location. The Knight reported the find to SIS Chief Rieekan, who told the Jedi to bring it back to the SIS safe house at the Promenade shopping complex. However, Sadic was aware of the safe house's existence and dispatched Mark II Power Guards to eliminate the SIS agents there; the Knight only arrived in time to save some of the agents.
The fight in the cybernetics lab first appeared in the Jedi Knight-class mission "Red Light, Black Heart" on Nar Shaddaa in Star Wars: The Old Republic, a video game released by BioWare in 2011.