Set in deep space, the game takes you on a mission to destroy a nest of alien Bio-morphs, which have infested and destroyed most of the humanoid colonies throughout the inhabited Galaxy. You play Jaid Ray, a rookie member of an elite band of space commandos, called the X-Terminators, who is sent into the complex which has been singled out as the source of the xenomorph menace. The complex contains 15 levels, move through it destroying the energy barriers, collect the remaining colonists who are attached to the walls and floor by alien secretions and then head to the elevator shaft to get to the next level while blasting the horrific alien forms before they metamorphose into their increasingly more powerful forms if left alone. Upgrade your armory have having extra equipment and ammunition beamed down between levels.