From the back of the box:
You are part of an elite commando force that must infiltrate a hostile alien city. Once inside, you must scour industrial landscapes, crawl through waterways and air ducts, navigate treacherous canyons teeming with vicious mutants, stow away on an alien spacecraft, and destroy the enemy's secret moon base.
18 arduous levels to conquer
added weapons to wield
fresh foes to defeat
breathtaking environments to explore