Before there were five Gundams, there was only one - and it existed strictly on paper. It was AC 180 - fifteen years before they would send their own respective custom-built Gundams to wage guerilla warfare on Earth - and the five eccentric scientists Doctor J, Professor G, Instructor H, Doktor S and Master O, had just completed designing the first mobile suit of that era, the OZ-00MS Tallgeese. Seeing their work being put to oppressive use in the form of mass-produced Leos - and spawned by the assassination of space colony political leader Heero Yuy - the five scientists decided to design their own mobile suit which could overpower OZ's forces.

This mobile suit was the XXXG-00W0 Wing Gundam Zero, and it was a design to truly be feared. In addition to being extremely maneuverable, the Wing Zero was a transformable mobile suit, capable of transforming into a fighter-like "Neo-Bird mode" for added speed and mobility. Sporting Gatling-like machinecannons, wing-mounted vulcan guns and beam sabers, its firepower was topped by an extremely powerful twin buster rifle, capable of wiping out entire groups of mobile suits in a single shot.

However, one more factor put the Wing Zero above everything else: the cockpit's "Zero System," which allowed the pilot's mind to interface directly with the Gundam's combat computer. Although the exact nature of the Zero System's operation is unclear, it appeared to operate by "sampling" the pilot's thoughts and, combining them with current combat data, presented the pilot with various alternate outcomes. Thus, depending on the pilot's mood, the Zero System could tell him/her how to achieve total victory... or decisive defeat.

Nevertheless, the mental stresses the Zero System would place on the pilot would be too great for any ordinary human to handle, and even the five mad scientists saw the dangerous turn their work was taking. And thus, the Wing Gundam Zero project was shelved. A copy of the plans went with each of the five scientists when they broke up and went underground to pursue their own individual plans for revolution against OZ. The Wing Zero design would serve as a base model for the five Gundams that would actually be built and sent to Earth.