The idyllic city of Neotopia comes under attack by the chibi-robot invasion force of the Dark Axis. It's up to a motley band -- Shute, a ten-year-old boy tinkerer; Captain Gundam, a somewhat-mysterious Neotopian Gundam; Zero the Winged Knight, of Lacroa; and Bakunetsumaru, the Blazing Samurai of Ark, as well as the Neotopia-based Super Dimensional Guard -- to save all their homelands from the evil of General Zeong.