Peri is a first-year student at the IF Academy and has been selected for a rare unsupervised exercise in space, paired with Diesel, a half-Martian from the Academy. While performing a routine exercise, they witness Earth coming under bombardment from Xion spaceships and soon find themselves behind the controls of the Phoenix, the most advanced space vessel known to man. As the Solar System is torn apart by a war between the Xions and Meigwors, Peri and Diesel are drawn helplessly into the intergalactic conflict. Now they - along with stowaway girl Selene - must work together to find a way home.