2003. After four years of scrupulous preparation under the prime minister, a new invincible robot, Mechagodzilla, has now reached completion, armed with various weapons, including the most powerful gun in history that can destroy anything in the world. Akane Yashiro is transferred to join the Mechagodzilla team as an operator who controls the mechanical monster. As soon as Mechagodzilla starts on its test run, the huge shadow of Godzilla begins to rise from the depths of the ocean...The battle of the century is going to take place between Godzilla and Mechagodzilla。