Return to Forever

Heero maneuvers his shuttle alongside the capsule containing Wing Zero and ejects from the shuttle. He gets inside, breaks the capsule open, and heads for Earth. On Earth, the Brussels presidential residence is lowered into the ground. While Wufei sits in orbit of Earth, he thinks about how before Operation Meteor he clashed with Master Long over the decision to drop the Long clan colony on Earth. Heero arrives at Earth, and Wufei attacks him. As they fight, Wufei tells Heero that Earth did not change after the Eve Wars. He says that to determine whether peace really did come, he will become evil itself. Duo breaks free from prison and finds Trowa sitting in a shuttle. Trowa says he is waiting for Sally, and she arrives after rescuing some hostages. In Brussels, Zechs and Noin fight off the Serpents with only the Taurus and the Tallgeese III. Their battle is more difficult because they are disabling the suits, not destroying them. Heero and Wufei continue to fight and enter the atmosphere. Heero tells Wufei that Treize is dead and his fight is over. Wufei says that he still fights Treize everyday, and that they both know they can only acknowledge their lives on the battlefield. Quatre, Trowa, and Duo reclaim their Gundams and head for Earth. Relena tries to make an announcement to the people, but Dekim stops her.

As Zechs and Noin are outnumbered, they receive help from the Gundams. Heero and Wufei still fight, and Heero asks how many times he must kill that girl and her dog. He then gives up and crashes into the ocean. Wufei is affected by this and has a flashback of his colony being destroyed. As citizens protest in the streets, he joins them. The Serpents continue to outnumber the Gundams, and they give up. Heero floats over the presidential residence with the battered Wing Zero and begins firing his buster rifle. Mariemaia begins to panic as the shelter collapses. Lady Une appears out of nowhere and saves Relena and Mariemaia. After the third shot, Wing Zero explodes and crashes on the ground. Lady Une is about to slap some sense into Mariemaia when Relena does it instead. Dekim is about to shoot Relena, and Mariemaia takes the bullet. He is then killed by one of his own men. Heero enters the room and offers to end Mariemaia's pain. He shoots his gun and finds it has no bullets. He no longer has to kill anyone and collapses. As AC 197 begins, the world is peaceful again. Duo, Quatre, and Trowa destroy their Gundams together. In China, Wufei destroys Altron. Sally asks him to become a Preventer, and he agrees. Zechs and Noin leave the Preventers to help terraform Mars. Lady Une takes Mariemaia to visit Treize's grave. Duo returns to a colony with Hilde, and Trowa rejoins the circus. Quatre parties with the Maganac Corps, and Heero watches Relena give a speech. Now that peace has been achieved, mobile suits are never seen again.