The Gundam pilots face their toughest challenge ever as the battle OZ forces equipped with a battle program based on the Epyon's operation system! Heero leaves Quartre to take command while he goes off on a separate mission -- to sneak onto the Libra. He Relena face Milliardo, but Milliardo has other callers as well. His old friend Treize has arrived and challenges him to a duel to decide the outcome of the war!.