Guided by scientist Tatsuya Randou, the Randou family embarks on a global expedition to locate ancient ruins and reveal the legend of Quetzalcoatl, which holds the key to a magnificent treasure. However, the evil organization Gopurin trails the Randou family, coveting the legendary treasure for itself. The Randou family possesses the secret weapon, the super robot Acrobunch. It becomes a worldwide race to see who discovers the treasure first.