In the year 2636, the alien war continues on and it's up to two soldiers, Bill Rizer and Lance Bean, to put a stop to the alien invasion. The aliens have ravaged the Earth with their powerful organic and technological weapons. Players can join with a partner and battle through 6 stages of non-stop run-and-gun action collecting power-ups including bombs, flamethrowers, spread shots, lasers and machine guns to take out the aliens. Bill and Lance travel through war-torn cities, on air bikes, riding missiles and ultimately into the alien base to defeat the alien boss once and for all.