mutant soldier shinichi ozaki is tasked with guarding a u.n. biologist, dr. miyuki otonashi, who is sent to study a mummified monster. they are teleported to infant island where they encounter the shobijin, fairies of mothra, who reveal the mummified monster as gigan, an alien cyborg sent to destroy the earth who was ultimately defeated by mothra. they warn that a battle between good and evil will happen soon and that ozaki must choose a side. giant monsters begin attacking several major cities. rodan attacks new york city, anguirus attacks shanghai, zilla attacks sydney, king caesar attacks okinawa, kamacuras attacks paris, kumonga attacks phoenix, ebirah attacks tokai, and hedorah attacks an unknown location. the edf engage the creatures, who mysteriously vanish at the same moment when an alien mothership appears over tokyo. the aliens, named xiliens, warn that an incoming planet called "gorath" will soon impact the earth. a peace pact is signed between earth and the xiliens. meanwhile, minilla, godzilla's son, is found in the forest by a boy and his grandfather.