Gundam Wing begins in the era of A.C. (After Colony - after the creation of space colonies inhabited by humans). War is constant on Earth, while the space colonies live in relative peace. The wars on earth finally ended in or about 175 A.C. At this point, the Earth government established the "Earth Sphere Unified Alliance". This organization was to promote peace on Earth and throughout the space colonies. Unknown to the general public, the Alliance was only a puppet for the industrialist group, The Romefeller Foundation.

In the name of peace, the Alliance's Army, known as "OZ", seized control of all space colonies and crushed all oppositions with mech-like fighting machines known as Mobile Suits (MS). After two decades of oppression, a group of rebels amongst the space colonies decided to show that they will not tolerate the iron grip of the Earth Alliance any further. With the help of the 5 scientists who first developed the MS, the rebels created five super fighting MS machines, known as Gundams. However, no ordinary pilots can control these machines due to their advanced technology. Therefore, 5 children were adopted and trained from a very young age with each having very distinct personalities.

Each soilder with the same mission to distroy Oz. In landing on Earth the pilots of the Gundams went after Oz at meeting were all the officals were held. Trying to destroy the Oz organisation the Gundams acedently destroyed the Earths Allience!

After this Oz took center stage. The pilots had to destroy the Oz and bring Earth to peace so each pilot took their own responsibility!