Before the outbreak of the colony war, forces were at work shaping the future and preparing its players for the final game. As children, Heero, Relena, Duo, Trowa, Quatre and Wufei have endured more pain and difficulties than most people experience in a lifetime and would have broken the will of any normal person. Learn their stories and motivations for becoming prominent characters in shaping the future of the world. Each chapter is named after a character and features that character's past/origins.

Note: The events of Episode Zero were supposed to appear in the TV series after episode 27 but was eventually omitted due to complications in the production schedule. Episode Zero was created per Ikeda Masashi's (director) request.

Centuries in the future, in the year After Colony 195, Earth is surrounded by orbiting space colonies. The colonists are cruelly oppressed by the Earth Alliance, which uses huge humanoid fighting machines called "mobile suits" to control the populace. Behind this tyranny is the secret society called "Oz," which has infiltrated the Alliance military and steered it towards its repressive course. Now, the space colonies are ready to strike back. Five young pilots, equipped with advanced mobile suits called "Gundams," are sent to Earth to wage guerilla war against Oz and its Alliance puppets. The war to decide humanity's destiny begins...