You must defend Earth from the attacking fleet of Galagon enemies! Maneuver your ship to avoid the incoming attack and use your cannon fire to destroy the invaders! The Galagons will attempt to capture your ship with their tractor beam. If you should get captured, free your comrade to double your fire power and turn the tables! Compete in the Galagon Challenge stages to improve your sharp-shooting skills and earn big points. Do you have what it takes to defeat all 99 levels and eliminate the alien threat once and for all?