Take advantage of the most advanced weapons technology money can buy. Shoot your way through the hordes of alien monstrosities and gain access to the teleports from where these ruthless creatures pour. Your mission is clear: clear the base at all costs. The security forces have been overrun and you are humanity's last hope! The endless dark and somber passages of a military complex have become the abode of evil, as thousands of blood-thirsty aliens fill the offices, storehouses, and mysterious labs.