When the Universe was invaded, Katrix fled from his home village when the Axis destroyed it. He was found by a "Light Makuta" named Light Tazzuk and would turn him into a Toa and would train him to become an extremely experienced Toa. After that, Katrix would then rebel against the Axis's reign over the Universe by forming a Resistant Army. He was able to gather all of the new leaders of their respective species, as most of the old leaders were killed by the Axis of Terror's army. He now leads many species against the Evil Army, with some of the higher ranking members are Toa that he'd form a Toa Team with (Galyku, Snovaro, Sekrox, Flaronn, Letrun, Jorkuz, Dervro, Rekvax {the three last Toa have yet to appear in "Universe at War"}, and possibly more).