Mark I Power Guards were the first model of soldiers augmented with the Power Guard Enhancement System, a supersoldier program developed by the Galactic Republic. When the Sith Lord Sadic acquired control of the Power Guard project in 3643 BBY, he manufactured Power Guards using refugees and wiped their minds, transforming them into mindless weapons for him to control. Mark I Power Guards were the weakest model of Power Guard but were equipped with advanced weapons and armor like later models. Several Mark I Power Guards were left to defend the Power Guard Cybernetics Lab after Sadic moved the program elsewhere, though they were no match for a young Jedi Knight who arrived not long afterward. After Sadic's defeat, the entire project was scuttled.