| Director | Jun Fukuda |
|---|---|
| Genre | action film, alien invasion, horror film, kaiju, science fiction film |
| Runtime | 89 min |
| Country | Japan |
| Budget | ¥30 million |
| Box office | ¥320 million |
The Nebulans, a race of cockroach-like aliens from a planet in M Space Hunter Nebula, plot to take over the Earth, as their home planet has been destroyed by pollution from another race native to the planet, which destroyed itself in the process. To carry out their plans in secret, they disguise themselves using skin suits based on deceased humans, and build World Children's Land, a theme park which serves as a disguise for their base of operations, centered inside a statue of Godzilla called the Godzilla Tower. They also have King Ghidorah and Gigan at their disposal, guiding the monsters using Action Signal Tapes, which broadcast a frequency that instructs them on what to do. The aliens plan to use their monsters to wipe out human civilisation.
Gengo Odaka, a freelance manga artist, inadvertently discovers one of the tapes after being hired by the Nebulans to produce concept art for the park. When the tape is played, the signal is heard by Godzilla and Anguirus on Monster Island, who realize something is amiss. Anguirus is sent to Tokyo to investigate, but is driven back by the JSDF. After reporting back to Godzilla, the two monsters set off for Tokyo again to confront the Nebulans at World Children's Land.
As they arrive, the Nebulans send Gigan and Ghidorah into battle, who prove to be more than a match for Godzilla and Anguirus; to make matters worse, Godzilla is badly injured by the Nebulans when the Godzilla Tower fires an extremely powerful laser weapon at Godzilla, and is rapidly overpowered by Gigan's assortment of bladed weapons. However, Gengo and his friends come to the aid of Godzilla and Anguirus when they destroy Godzilla Tower with TNT supplied by the JSDF, killing the Nebulans and leaving Ghidorah and Gigan without instruction.
Though the extraterrestrial monsters manage to regain their composure and briefly resume the fight, Godzilla and Anguirus now have the upper hand, and manage to drive both Ghidorah and Gigan into a full retreat. With the invasion defeated, Godzilla and Anguirus begin the return trip to Monster Island, much to the cheers of the humans who helped them fend off their opponents.