Japan is thrown into a panic after several ships are sunk near Odo Island. An expedition to the island led by Dr. Kyohei Yamane soon discover something far more devastating than imagined in the form of a 50 meter tall monster whom the natives call Gojira. Now the monster begins a rampage that threatens to destroy not only Japan, but the rest of the world as well.

During an assignment, foreign correspondent Steve Martin spends a layover in Tokyo and is caught amid the rampage of an unstoppable prehistoric monster the Japanese call 'Godzilla'. The only hope for both Japan and the world lies on a secret weapon, which may prove more destructive than the monster itself.

Mining engineer Shigeru investigates the disappearance and death of his fellow coworkers when prehistoric nymphs are discovered emerging from the mines. After an attack on the local village, Shigeru heads deeper into the mines only to make a more horrifying discovery in the form a prehistoric flying creature. Soon a second monster appears as the two converge in Fukuoka.

Two fishing scout pilots make a horrifying discovery when they encounter a second Godzilla alongside a new monster named Anguirus. Without the weapon that killed the original, authorities attempt to lure Godzilla away from the mainland. But Anguirus soon arrives and the two monsters make their way towards Osaka as Japan braces for tragedy.

Three competing parties all race against time to track down an elusive creature known only as the Snowman.

Mentre Tokyo è ormai ridotta ad un cumulo di macerie, Steve Martin, giornalista americano del United World News, racconta di come la città è stata attaccata da una mostruosa creatura. Il racconto poi torna al presente e segue le operazioni che conducono alla distruzione di Godzilla, sconfitto grazie all'intervento del professor Serizawa, vecchio amico di Steve.

An American scientist tells two colleagues about the finding of an abominable snowman living in the Japanese alps, where it is worshipped by a remote tribe as a god, and how it was discovered by modern man after it raided a skiers shelter following an avalanche, killing all inside. This is an adaptation of the Japanese film "Jūjin Yuki Otoko" (1955) with added American-made footage, narration, and music.