The year is 2499. Starvation due to overpopulation is imminent. Northstar project, a gigantic food factory orbiting Earth, is about to solve the problem until it is overtaken by aliens. You are now sent to the factory with one mission: To reclaim the factory, reactivate the life-support system and restore Earth's food supply. This is easier said than done, as level after level you will have to face zillions of alien critters... and you only have four lives.