The aliens are back again and this time they have taken some of our soldiers as hostages. You must teach these aliens a lesson. Make your way through the alien territory and shoot down all the aliens that come along your way. Collect the Mega power up to boost your gun fire. But, if you get hit by the enemies then you'll lost the mega power and a life. Use the grenades to bring down huge monsters. Reach the portal at the end of each level to proceed to the next level.