The Microman story is about a miniature humanoid alien race, which fight against the evil Acroyears which are both about three inches in size. The Microman have the gift to shrink objects and then to bring them back to their original size. The Acroyears have the gift to increase their own sizes and then to return to their original sizes. After Microearth, the homeplanet of the Microman, is destroyed, a number of Microman manage to escape. They eventually reach Earth were they continue their battle against the Acroyears. They encounter more surviving members of their kind, and build all sorts of mecha and vehicles to help them in their fight.