Welcome to the Intergalactic Force Academy-IF for short-the training ground for an elite young fighting team sworn to protect and defend the galaxy. Peri is a first-year student who has been selected for a rare unsupervised exercise in space. His co-pilot? A half-Martian named Diesel. While performing a routine exercise, Peri and Diesel witness Earth getting bombarded by Xion spaceships-and the pair are quickly drawn into the fray.