is a 1973 Japanese kaiju film directed by Jun Fukuda, written by Fukuda and Shinichi Sekizawa, and produced by Tomoyuki Tanaka, with special effects by Teruyoshi Nakano. Distributed by Toho and produced under their effects subsidiary Toho–Eizo, it is the 13th film in the Godzilla franchise, and features the fictional monster characters Godzilla, Megalon, and Gigan, along with the mecha character Jet Jaguar. The film stars Katsuhiko Sasaki, Hiroyuki Kawase, Yutaka Hayashi, and Robert Dunham, alongside Shinji Takagi as Godzilla, Hideto Date as Megalon, Kenpachiro Satsuma as Gigan, and Tsugutoshi Komada as Jet Jaguar.

Plot

In the first part of 1971 (197X in the Japanese version), the second of series of underground nuclear tests is conducted, near the Aleutians, sending shockwaves as far as Monster Island in the South Pacific, severely damaging the island paradise and sending Anguirus plummeting into the depths of the Earth, with Godzilla narrowly escaping the fissure into which his friends tumble.