The film was released direct to video in the United States in 1998 by Columbia Tristar Home Video as Godzilla vs. King Ghidora.
Kenichiro Terasawa (Kosuke Toyohara), an author of books on psychic phenomena, believes he's discovered Godzilla's true origin. During World War II, a group of Japanese soldiers stationed on Lagos Island in South Pacific  were unintentionally saved by a Godzillasaurus, which attacked and killed a group of American soldiers who had landed on the island in February 1944 as part of the Gilbert and Marshall Islands campaign. While all of the Japanese soldiers on the nearby Islands fought and died to the last man, the Japanese soldiers on Lagos survived the war and eventually returned to Japan. In 1954, the island was destroyed by a hydrogen bomb test, just months before Godzilla first attacked Tokyo.
Yasuaki Shindo (Yoshio Tsuchiya), who commanded the Japanese on Lagos, is now a wealthy businessman who denies the dinosaur's existence. Meanwhile, a UFO lands on Mount Fuji. When the army investigates, they are greeted by Wilson (Chuck Wilson), Grenchko (Richard Berger), Emmy Kano (Anna Nakagawa) and android M-11 (Robert Scott Field). The visitors, called the Futurians, explain that they're from the year 2204, a time long after Japan had been completely destroyed by Godzilla. They explain that they can time travel back to 1944 and remove the Godzillasaurus from Lagos, thereby avoiding the creation of Godzilla. As proof of their story, Emmy presents to the Japanese government a copy of Terasawa's book, which he hasn't even written yet.
M-11 then teleports the dinosaur to an island in the Bering Sea. They then return to 1992, but not before releasing three, small artificial creatures called Dorats on Lagos. The radiation as a result of the nuclear test fuses them into King Ghidorah. The Futurians use Ghidorah in the present to subjugate Japan. They issue an ultimatum, but Japan refuses to surrender.
Feeling sympathy for the Japanese, Emmy reveals the truth behind the Futurians' mission: in the future, Japan becomes very wealthy surpasses that of the United States, Russia and China. The Futurians in fact stole the time machine and plan to use King Ghidorah to alter the future by devastating present-day Japan, preventing its future economic reign. After she is returned to her ship by M-11, she reprograms the android. With his, and Terasawa's aid, they sabotage Ghidorah's control in the UFO. However, Emmy's companions reveal that their ship is bound to automatic time warp in the event of sabotage, allowing them to return to a future where Japan has been destroyed either way.
Godzilla finally arrives in Japan and is greeted by King Ghidorah, who was sent by Wilson to destroy Godzilla. Godzilla and King Ghidorah have a long hard battle which eventually ends with Godzilla blasting the middle head of King Ghidorah. Before the final blow, Godzilla destroys the UFO, which was teleported by M-11 before it could time warp, killing Wilson and Grenchko. Japanase troops attack Godzilla in Sapporo, to no avail. He then turns his attention on Tokyo, destroying the metropolis. In the process, Shindo is killed; though not before he and Godzilla share a brief moment, where Godzilla is seemingly sad for once.
Emmy, however, travels to the future and returns with Mecha-King Ghidorah, a resurrected cyborg version of the original creature. Battling in the heart of Tokyo, Emmy carries Godzilla off and drops the monster together with Ghidorah into the ocean. She then returns to the future in the time shuttle, but not before informing Terasawa that she is in fact a descendant of his.
At the bottom of the sea, Godzilla recovers and roars over Mecha-King Ghidorah's remains.
Kosuke Toyohara as Kenichiro Terasawa
Anna Nakagawa as Emmy Kano
Megumi Odaka as Miki Saegusa
Katsuhiko Sasaki as Professor Mazaki
Akiji Kobayashi as Ryuzo Dobashi
Tokuma Nishioka as Takehito Fujio
Yoshio Tsuchiya as Yasuaki Shindo
Kiwako Harada as Chiaki Moriyuma
Kenji Sahara as Takayuki Segawa
So Yamamura as the Prime Minister
Chuck Wilson as Wilson
Richard Berger as Grenchko
Robert Scott Field as M-11, an android
Kenpachiro Satsuma as Godzilla, the King of the Monsters and the titular kaiju who is the only hope in defeating King Ghidorah.
Hurricane Ryu as King Ghidorah, the main antagonist of the film and a giant, flying three-headed dragon who is defeated by Godzilla but later resurrected as a cyborg to stop Godzilla.
Wataru Fukuda as Godzillasaurus, Godzilla's un-mutated form
This film is set after the events of The Return of Godzilla (1984) and Godzilla vs. Biollante (1989). Originally, the film was to be a remake of King Kong vs. Godzilla with the title Godzilla vs. King Kong, but Turner Entertainment demanded too much money for the use of Kong. After this, Toho had the idea of making Godzilla vs. Mechani-Kong (from 1967's King Kong Escapes), but director Kazuki Omori feared that this would ultimately violate Turner's copyright as well. Toho eventually settled for Godzilla vs. King Ghidorah, pitting Godzilla against his archenemy from the original series.
After the film was released in Japan, Toho commissioned a Hong Kong company to dub the film into English. Instead of creating a unique title screen for the movie, as had been done with the previous international versions of Godzilla films, the international title for the film was simply superimposed over the Japanese title.
In Italy, Yamato Video dubbed the international version of both movies into Italian, despite using complete international prints for both films.
Columbia TriStar Home Entertainment released Godzilla vs. King Ghidorah and Godzilla vs. Mothra on home video on April 28, 1998. This was the first time either film had been officially released in the United States.
TriStar used the Toho dubbed versions, but cut the end credits and created new titles and opening credits for both films. Some VHS copies of the film opened and closed with the 1984 TriStar Pictures logo.
According to Toho, the film sold approximately 2,700,000 tickets in Japan, and grossed around $11,000,000 (U.S).
Home Media Release (US)
Columbia/Tristar Home Entertainment
Released: November 10, 1998
Aspect Ratio: Full Frame (1.33:1) [NTSC]
Sound: English (2.0)
Supplements: Liner notes
Case type: Keep Case
Region 1 (DVD)
Notes: Only in a double feature with “Godzilla and Mothra: The Battle for Earth (1992)".
Blu-Ray will be coming out May 6, 2014 as a double feature with Godzilla vs. Mothra.
This film was considered controversial at the time of its release due to its fictional World War II sequence. The scene depicted American soldiers being killed by a Godzillasaurus, allowing Japanese soldiers to escape. The film's plot, involving Western villains from the future attempting to subjugate Japan, was also debated. Director Kazuki Ōmori defended his artistic decision on camera, arguing that the film was not in fact meant to be anti-American. It was also noted that there was considerable negative publicity regarding economic tensions between the United States and Japan at the time the film was made.