Deep within an ancient bunker, the Desert Rangers uncover the secret to defeating the Base Cochise AI, the crazed computer responsible for spawning the killer robots terrorizing the Arizona wastes. But the secret is protected by a cult known as the Guardians, who hate everything the rangers stand for.

Hunting for the source of the killer robots terrorizing the Arizona wastes, a team of Desert Rangers stumbles into the town of Darwin's Village. One of them, Ghost, is also looking for other answers. Only days before he awoke in a cloning chamber knowing nothing of his previous life except that he'd worn a ranger's star and he'd died in Darwin's Village. But who killed him? And why?