Godzilla vs. Mechagodzilla (ゴジラ対メカゴジラ, Gojira tai Mekagojira) is a 1974 Japanese action-adventure kaiju film directed by Jun Fukuda, with special effects by Teruyoshi Nakano. Distributed by Toho and produced under their effects subsidiary Toho–Eizo, it is the 14th film of the Godzilla franchise, and features the fictional monster characters Godzilla, Anguirus, and King Caesar, along with the mecha character Mechagodzilla. The film stars Masaaki Daimon, Kazuya Aoyama, Gorō Mutsumi, and Akihiko Hirata, with Isao Zushi as Godzilla, Satoru Kuzumi as both Anguirus and King Caesar, and Kazunari Mori as Mechagodzilla. The film marks the first appearances of King Caesar and Mechagodzilla in the franchise.

Godzilla vs. Mechagodzilla was released theatrically in Japan on March 21, 1974, to generally positive reviews. The film received a limited release in the United States in 1977 by Cinema Shares, under the title Godzilla vs. the Bionic Monster. It was then quickly re-released under the title Godzilla vs. the Cosmic Monster which was also the UK theatrical title. The film was followed up with a direct sequel in 1975 titled Terror of Mechagodzilla.

Plot

In Okinawa, an Azumi priestess has a vision of a city being destroyed by a giant monster. Meanwhile, Masahiko Shimizu discovers a type of metal not found on Earth while spelunking and takes it to Professor Miyajima for examination. An excavation led by Masahiko's brother Keisuke uncovers a chamber filled with ancient artifacts and a mural bearing an ominous prophecy: "When a black mountain appears above the clouds, a huge monster will arise and try to destroy the world; but when the red moon sets and the sun rises in the west, two monsters shall appear to save the people." Keisuke is joined by archaeologist Saeko Kaneshiro, who translates the prophecy and takes a statue bearing the likeness of Okinawa's guardian monster King Caesar to study. Two men stalk them, one claiming to be a reporter while the other attempts to steal the statue, but fails and flees.

Source: Wikipedia