The United Earth Sphere Alliance rules the Earth Sphere with an iron fist by way of Humongous Mecha known as mobile suits. Rebellious elements within the Space Colonies decide to fight back by sending five powerful mobile suits — Gundams — down to Earth so they can wreak havoc on the military forces.
Relena Darlian, the teenage daughter of an important colonial diplomat, accidentally discovers the identity of a Gundam pilot who was shot down during his entry to Earth: a teenage boy named Heero Yuy. Because she can positively identify him, Heero tracks Relena down and swears to kill her (something he never quite gets around to doing). From there, Heero and the other four Gundam pilots find themselves having to blast their way through the various groups in power behind the UESA (and eventually their own force) while Relena fights in her own way to bring about peace between the Earth and the colonies amidst various political power shifts caused by the Gundam rebellion.
