While Monaka delivers a package to Bulma, Goten and Trunks sneak into his delivery truck and are accidentally taken to Planet Po-tau-feu where they encounter a group of space bandits are led by a teal humanoid called Gryll (グリル, Guriru) attempt to steal a key to a treasure Superhuman Water (超人水, Chōjin Mizu) from an elder named Potage (ポタジ, Potaji)...