Tallgeese Destroyed
Lady Une returns from the peace conference, and gets a report that all Gundam scientists have been captured. Apparently the scientists are the ones who built the Tallgeese 20 years ago, but then disappeared without a trace. Lady Une orders a mobile suit better than Tallgeese to be built.
Meanwhile, Zechs has been captured by OZ forces, and talks about his future with Treize. Treize wants Zechs to continue fighting for OZ, with the mission to destroy Gundam, but Zechs says he can't follow the Romefeller foundation's wishes anymore, as the Gundams fight for personal reasons. Treize thinks this is the end, Zechs will have to die for OZ. Instead of finding Zechs guilty in a court, he decides that Zechs should die a noble death on the battlefield, and a test with the Tallgeese is scheduled for this purpose.
Participating in the test with Tallgeese is a new type of mobile suits - remote controlled mobile dolls, designed by Tsubarov, who oversees the test. Suddenly, a Leo attacks the OZ forces, and its pilot, none other than Treize himself, says he want to test the new mobile suits. Tsubarov finds him insane, and orders Treize to be killed. No one follows orders, and Treize retorts with ordering Tsubarov to be put to death, whereupon the OZ soldiers assembled in the control room all draw their guns. Treize means that fighting with mobile dolls isn't the only way to win a war, humans are still needed. While Treize still finds Zechs a problem, he thinks that there'll only be untrustworthy people left in OZ if he leaves.
Back in space, a shuttle approaches Alliance space, and the Alliance soldiers thinks it may be carrying a Gundam pilot. Since they have the same enemy, OZ, they decide to help him as OZ forces approach the shuttle. The OZ forces realise that the Alliance must have found the Gundam pilot, and dispatches the mobile dolls to deal with them.
In a mobile suits hangar on the colony the Gundam scientists were taken to, they begin to plot their next move in the war against OZ. The scientists mean that war should be fought by people, not lifeless mobile dolls, but refuse to cooperate when Lady Une asks them to build their ideal mobile suit, they say they'd rather die than do that for the OZ. Suddenly, Lady Une gets a report that they have found a Gundam pilot, and orders the shuttle to be destroyed.
At the battle between the Federation and OZ forces, the Federation is losing against the mobile dolls. As the Federation suits have all been destroyed, OZ get ready to board the shuttle when Lady Une interferes, they don't need the pilot if he doesn't have a mobile suit, just kill him instead. At that point, Dr. J interrupts Lady Une, asking to have her comminucation unit. She accepts, and Dr. J tunes in on a coded frequency used by Gundam 01, to find a message from Quatre that urges the Gundam pilots to unite and fight to protect the colonies. Dr. J believes that this Gundam pilot is the one that could unite the other pilots, and he decide that they will make a mobile suit for OZ after all, to save Quatre's life.
Some Alliance suits were still in the area of the shuttle, and boards it to find the unconscious Quatre. At the same time, Lady Une orders her subordinate Nicols to board the shuttle, when it suddenly drives away. The OZ forces attacks the shuttle, and it is destroyed... However, the Federation soldier who previosly boarded the shuttle traded places with Quatre, putting the knocked out Gundam pilot in his own mobile suit that gets sent away unnoticed, and sacrificing his life in the shuttle so the OZ forces should think the Gundam pilot is dead. Quatre continues to float aimlessly in space, in a Federation suit this time.
Back at the Tallgeese test site on earth, the tests continue. The heavy attack on Tallgeese commences, and eventually ends with Zechs mask breaking... Before that, Zechs said he would fight until the mask broke, and once it did, he comments that he can no longer be Treize's friend. He then takes off into space.
On one of the colonies, Heero has enrolled in a school to seek cover, using the name Duo Maxwell, and holds an introductory speech to his new classmates about the mechanics of war. The students and his teacher are horrified, and ask him to stop before he reaches its end, commenting that it was hardly a proper introduction. During the speech, pictures of the other Gundam pilots and an unconscious Zechs on a beach is shown.