In the future, man has conquered the space and it seems that there would be nothing to hinder the success rate, but then again, some zombies appeared. The zombie apocalypse happened when you are stationed at one at the floating station in space. Now, the zombies want more than just Earth as they want the stars too. You can't let that happened. Your goal would be to eliminate every last bit of zombies in each level. You can get more ammo from the zombies after you killed them. The game gets harder and harder as you make some progress.