It is the year After Colony 196, and the battles between Earth and the space colonies have ended. Treize Khushrenada is dead and OZ has come to an end. This gives birth to the Earth Sphere Unified Nation (ESUN) and the Preventers. Seeing they won't be needed anymore, the Gundam pilots (except Chang Wufei) send their suits into the sun. However, this peace would not last, for a rebellion occurs on the newly completed colony, L3 X-18999. Led by seven-year-old Mariemaia Khushrenada, Treize's illegitimate daughter, the rebellion kidnaps Relena Darlian, now the Vice Foreign Minister of the ESUN, during a diplomatic mission to X-18999. As the Gundam pilots investigate further, they discover that Mariemaia is merely a puppet controlled by her grandfather Dekim Barton, a former advisor to martyred colony leader Heero Yuy, who is using X-18999 to go through with the original Operation Meteor, as a contingency plan in case the ESUN doesn't comply. The Gundam pilots must prevent Dekim from seizing power over the ESUN. The Gundams are retrieved from their course to sun to Earth's orbit thanks to Quatre and the Maganacs. The pilots use their Gundams one last time to fight against Dekim's forces, not killing anyone. In the end, Dekim is killed by one of his own soldiers, Earth and its colonies are at peace once again and all mobile suits (including the Gundams) are forever destroyed and never seen again.
