
After a brief confrontation, the Earth monsters succeed in driving King Ghidorah away. They also bring Glenn, Fuji, and the scientist Sakurai with them. The Xiliens locate Godzilla and Rodan, both sleeping, and use their technology to transport them to Planet X. The Controller apologizes for coming to Earth without permission. Their suspicions appear confirmed when three Xilien spacecraft appear in Japan. Glenn and Fuji begin to worry that the Xiliens may have ulterior motives. Tetsuo sees Namikawa with Glenn and later follows her, but he is captured and imprisoned by Xilien spies. Tetsuo is romantically involved with Fuji's sister, Haruno, but Fuji disapproves, finding him unworthy of Haruno. He sells it to a businesswoman named Namikawa, but she disappears before paying him. Meanwhile, an inventor named Tetsuo has designed a personal alarm that emits an ear-splitting electric siren. The astronauts return to Earth and deliver the message. He requests to borrow the Earth monsters Godzilla and Rodan to act as protectors to fight it once more (since 1964), in return for the cure for cancer (the English dub says that the formula can cure any disease). The monster eventually leaves, but the Controller states that King Ghidorah has been attacking repeatedly, forcing them to live underground in constant fear. The aliens usher the astronauts into their underground base, and moments later the surface is attacked by a creature that the Xiliens call "Monster Zero", but which the astronauts recognize as King Ghidorah, a planet-destroying monster that had attacked Earth once before.

There they encounter advanced and seemingly benevolent human-like beings called the Xiliens and their leader the Controller. In the year 196X, two astronauts, Fuji and Glenn, are sent to investigate the surface of the mysterious "Planet X". The film was followed by Ebirah, Horror of the Deep, released on December 17, 1966. It was followed by a theatrical release in the United States on Jby Maron Films as Monster Zero, on a double bill with The War of the Gargantuas. Invasion of Astro-Monster was theatrically released in Japan on December 19, 1965. In the film, aliens plead with humanity to borrow Godzilla and Rodan to defeat King Ghidorah, only to betray the humans and unleash the monsters on the Earth. The film stars Akira Takarada, Nick Adams, Kumi Mizuno, Akira Kubo, and Yoshio Tsuchiya, with Haruo Nakajima as Godzilla, Masaki Shinohara as Rodan, and Shoichi Hirose as King Ghidorah. The film was a Japanese-American co-production it was the second collaboration between Toho Co., Ltd and UPA. It is the sixth film in the Godzilla franchise and Shōwa period.

' The Giant Monster War ') is a 1965 kaiju film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. Invasion of Astro-Monster ( 怪獣大戦争, Kaijū Daisensō, lit.
