...If they kill everyone in the middelages there would be no one to create the first robots later on. So there wouldn't be any robots. And if there aren't any robots, they can't return to the middelages... I think... <img src="/ubbthreads/images/graemlins/think.gif" alt="" /> <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />