The endless darkness and the somber, long passages of a military complex have become the abode of evil, as thousands of blood-thirsty creatures fill its offices, storehouses, and laboratories. Your mission is simple: Clear the base at all costs. You will be provided with explosives to help you gain access to the teleporters from which pour thousands of the pitiless creatures. A stationary gun will aid in the defense of the area. You have been granted access to the most advanced weapons money can buy. As you earn your pay, you can equip yourself with additional weapons in the arming area and biomechanical implants that will make your fighting abilities superhuman. The alien invasion has begun, and we have one chance to stop them cold in their staging area. Do not allow them to escape this facility--you are the last hope. The fate of humanity now depends on you.