Its plot concerns the United States government forming a new organization, G-Force, dedicated to stopping the attacks of giant monsters, especially Godzilla.
The initial wave delivers a parasitic alien organism to Earth, which bonds with a praying mantis to form a swarm of gigantic creatures dubbed Kamacuras.
An ancient civilization, long dead and buried beneath Antarctica, springs to life with the arrival of a teenage girl from the surface world, who becomes corrupted by the power she finds there and seeks to destroy mankind, unleashing five new monsters: Gigan, Megalon, Manda, Battra and Hedorah.
With the help of a group of teenage scientists, Mothra, a young Rodan (the one that hatched from the egg on Mount Rushmore), and the newly awakened Anguirus, Godzilla makes it to the city in the earth.
Set in the year 2004, Godzilla emerges from a volcano while the United States, Russia, and Mongolia have each been developing anti-monster mechs: Mechagodzilla, Moguera and Mecha-King Ghidorah, respectively.
In Montana, Mechagodzilla is pitted against Baragon, who has emerged from hibernation to feed on humans and herds of cattle alike, while Moguera defeats and captures Anguirus in Russia.
In the climax of the novel, Godzilla escapes from the bottom of the Earth and returns to Japan to do battle with Ghidorah, unwittingly teaming up with Mechagodzilla and Moguera in the process.
Furthermore, Raijin/Daitengu would have actually been the herald and champion for an even more powerful intelligence, namely the Earth itself, which not only rose the lost continent and summoned all the monsters to it, but also possessed Biollante to serve as its avatar, as well as creating equally monstrous forest growth which soon appears all over the world, in a catastrophic bid to cleanse itself of all human life.