A sudden Allied attack interrupts the duel between Heero and Zechs. While Heeros joins his unit in battle, Zechs is ordered to remain behind and sacrifice himself for OZ’s greater good. In the meantime, OZ takes control of the Allies and colonies. Captured scientists try to make a deal with OZ to create new mobile suits in exchange for their freedom. Will the Allies succumb to OZ’s forces, or do they have a secret card up their sleeve?