The game commences in the aftermath of a hostile ground invasion of Earth by ravaging Alien forces. Mankind is threatened with near extinction. All large-scale resistance has been swept aside. The purpose of the invasion is unknown, but to the horror of all, the surviving humans begin to hear rumours of Droning - Aliens reprogramming and adapting captured humans into Cyborg warriors and slaves. Earths last hope is Lieutenant Vaughan, one of the few remaining resistance fighters. He must battle against Cyborg humans, much more powerful than a man and utterly remorseless in combat.