Godzilla vs. Gigan is a 1972 Japanese science-fiction Kaiju film produced by Toho.
Directed by Jun Fukuda with special effects by Teruyoshi Nakano, the film starred Hiroshi Ishikawa, Yuriko Hishimi and Minoru Takashima. The 12th film of the Godzilla series, this film featured the return of Godzilla’s greatest foe King Ghidorah.
Producer Tomoyuki Tanaka was displeased with the previous film, Godzilla vs Hedorah, and wanted to return the series to the more traditional route of well known monsters and an alien invasion plot. This was the last film in which Godzilla was portrayed by Haruo Nakajima who had played the character since the first film in 1954.
The film received a limited theatrical release in the United States in 1978 by Cinema Shares as Godzilla on Monster Island.
Giant insectoid aliens from a dying planet in “Space Hunter Nebula-M” plot to colonize the Earth. The aliens assume the forms of dead humans and work as the development staff of the peace-themed theme park, World Children’s Land, the centerpiece of which is “Godzilla Tower”. The Nebula-M aliens plan to use the space monsters Gigan and King Ghidorah, guided by two “Action Signal Tapes,” to wipe out human civilization.
Manga artist Gengo Kotaka stumbles onto their plan after being hired as a concept artist for the park. When Gengo and his friends accidentally obtain one of the Action Signal Tapes and play it, Godzilla and Anguirus hear the signal and realize something is amiss. Godzilla sends Anguirus to investigate. When Anguirus approaches Tokyo, the Japan Self Defense Forces, misunderstanding the monster’s intentions, drives him away.
Anguirus reports back to Monster Island, and Godzilla follows him back to Japan to save the Earth from Gigan and King Ghidorah. The aliens attempt to kill Godzilla with a lethal laser cannon hidden inside Godzilla Tower, but Gengo and his companions destroy the tower along with the aliens.