Aliens from Space Hunter Nebula M summon King Ghidorah and Gigan from space to destroy the Earth. Godzilla and Anguirus break out of Monster Island and venture to Japan and, after a long battle, drive the two space monsters away and save the Earth. (Godzilla vs. Gigan)
Various kaiju appear across Japan with little explanation. Godman travels across the country defeating them in various battles. Some of these monsters, such as Gaira, Sanda, Gabara and Gorosaurus, to name a few, had previously menaced Japan before.