Zechs, now fully opposed to Romefeller's tactics, begins to move against them. But Heero and Trowa, who are serving as test pilots for OZ, have been ordered by Lady Une to stop him. Even if Lady Une is acting without the permission of Romefeller, as she becomes an advocate for peace. And Quatre, after a tragic visit home, returns to the battle piloting a new and terrible Mobile Suit with an operating system that drives its pilot insane - the Wing Gundam Zero. Contains Episodes 21-25