As an intergalactic battle between two alien planets, Xion and Meigwor, causes trouble in outer space, Peri and his half-Martian best friend Diesel, find themselves caught in the middle. The Meigwors are acting seriously weird and making outrageous demands! When the war puts Peri and Diesel's friend Selene in danger, though, they'll have to think quickly if they want to save her and the universe.