Terasawa discovers that a Russian nuclear submarine sank in the Bering Strait in the 1970s and released enough radiation to mutate the dinosaur into Godzilla. Shindo plans to use his nuclear submarine to rejuvenate Godzilla. En route to the Bering Strait, Shindo's submarine is destroyed by Godzilla, who absorbs its radiation and becomes larger and more powerful. Godzilla arrives in Japan and is met by King Ghidorah. They fight at equal strength, each immune to the other's attacks. With M-11 and Terasawa's aid, Emmy sabotages the UFO's control over King Ghidorah, causing the three-headed monster to lose focus during the battle. Godzilla eventually ends the battle by blasting off Ghidorah's middle head. Before sending King Ghidorah crashing into the ocean, Godzilla destroys the UFO, killing Wilson and Grenchiko before turning its attention on Tokyo, destroying the city and killing Shindo.