USS Iowa is on its final voyage before being decommissioned and turning into a floating museum. When USS Enterprise is attacked and destroyed by a mysterious force, World War III looms. The captain of Iowa chases an invisible ship, which they discover to be an alien force waging war on Earth. Only the crew of this last American battleship, stands in their way. (The Iowa’s outdated technology is immune to the electromagnetic pulse (EMP) weapons of the alien.)
During the fight, in Washington, D.C., General McKraken attempts to steer the high stake game of brinkmanship between the U.S. and other world powers as several coast towns in North Korea were also attacked, in an apparent attempt by the aliens to get the world to destroy itself. McKraken’s diplomatic efforts attempt to buy Iowa time to provide proof of the alien incursion.