From a remote Scottish mountain, Dr. Oliver Webb--one of the world's great physicists--is whisked away by a military helicopter and routed to the Mexican border. Along with the leading men of physics and one sexy atom smasher, Webb is given an impossible task: identify the asteroid--codename Nemesis--that is on course to collide with and destroy America. They have five days to stop it. If they can't, the President will retaliate first by ordering the U.S. military to pull the nuclear trigger.