The United Nations assembles the ultimate weapon to defeat Godzilla, while scientists discover a fresh pteranodon egg on a remote Japanese island.

Japan is caught in the middle of a three way battle between Godzilla, the divine Mothra, and her dark counterpart Battra.

The aftermath of the Oxygen Destroyer brings forth Destoroyah, a beast intent on killing Godzilla, who is on the verge of a nuclear meltdown.