Visitors from the 23rd century (the year 2204), dubbed the Futurians, arrive in Japan to deliver a warning: very soon, Godzilla will recover from his ANEB infection and return to Japan. According to the time travelers, Godzilla will completely destroy the country, making it uninhabitable in the future. The Futurians propose a radical plan: travel back in time to the year 1944 and teleport the dinosaur (dubbed the Godzillasaurus) from Lagos Island, a small island that would, ten years later, be hit with the radioactivity from the first H-bomb test. The Futurians embark on their mission, and are successful in teleporting the Godzillasaurus off the island, seemingly preventing the creation of Godzilla. However, the time travelers have an ulterior motive, and release three genetically engineered animals called Dorats onto the island before departing. Ten years later, the H-bomb is tested, mutating the Dorats and fusing them into one monster: King Ghidorah. The Futurian's story about Godzilla's attack on Japan is false; in fact, Japan is destined to grow larger and ultimately become a gigantic superpower by 2204. The Futurians are in fact terrorists, bent on weakening Japan in the past first by removing Godzilla from the picture, and then by destroying it with the monster King Ghidorah.
However, the Futurians' actions had not actually erased Godzilla from history, but led to his creation in the first place. The Godzillasaurus was mutated by a nuclear submarine crash in the Bering Sea and became Godzilla. The Japanese government, mistakenly believing that the un-mutated Godzillasaurus is still dormant in the Bering Sea, sends a nuclear submarine in the hope of recreating Godzilla. En route, the sub is intercepted by the still-existing Godzilla. Godzilla destroys the submarine and absorbs its energy, burning off his ANEB infection and growing him from 80 to 100 meters in height. The King of the Monsters, now 100 meters tall, emerges from the sea and makes his way towards King Ghidorah, The two monsters fight, and Godzilla eventually wins when the Futurians are beaten and their control of King Ghidorah is terminated. Godzilla blows off King Ghidorah's middle head and blasts holes in his wings, causing him to fall into the sea. Unfortunately, Godzilla then turns and begins to attack Japan itself. In response, the Futurian who rebelled against her former allies proposes returning to 2204 and reviving King Ghidorah as a weapon to be used to fight Godzilla. She succeeds, and returns to 1992 as the pilot of the cyborg, Mecha-King Ghidorah. She then engages Godzilla in Tokyo and quickly lifts the King of the Monsters out of the city. Unfortunately, one final blast from Godzilla's Heat Ray destroys Mecha-Ghidorah and both monsters fall into the sea. Emmy, the pilot, escapes, but Godzilla remains alive. The giant creature then makes it's way to the Ogasawara Trench and falls into a deep slumber. (Godzilla vs. King Ghidorah)