The Earth Defense Force are locked in battle with a number of monsters attacking cities around the world, when a mysterious race of aliens known as the Xiliens arrive on Earth. Reviving Godzilla may be the EDF's only chance to save the planet.
Godzilla and Kong must fend off a second Ghidorah, after Monarch discovers a hostile alien civilization who allied with Ghidorah, called the Xiliens, and declared war on humanity.