After a series of earthquakes, an undersea civilization called Seatopia decides to strike at the surface world, which it blames for the nuclear testing that has damaged its realm. The Seatopians seize a humanoid robot built by inventor Goro Ibuki and send the giant insect monster Megalon to devastate the surface, intending to use the robot as a guide. Ibuki and his companions manage to regain control of the machine, which acts on its own, and it goes to summon Godzilla. The Seatopians bring in the space monster Gigan as reinforcements, leaving Godzilla and the robot to face two creatures at once.
Jun Fukuda directed and wrote the screenplay, with Tomoyuki Tanaka producing. The film was released in 1973 and runs 78 minutes. It followed Fukuda's Godzilla vs. Gigan from the previous year; he went on to direct Godzilla vs. Mechagodzilla in 1974, and Godzilla vs. Megalon stands in the middle of the five Godzilla films he made. Katsuhiko Sasaki plays Ibuki, alongside Yutaka Hayashi, Hiroyuki Kawase, Kanta Mori and Kotaro Tomita among a credited cast of 21.
The film took about 20 million dollars worldwide. On IMDb it holds a rating of 4.9 out of 10 from 7,800 votes, while on TMDB it has 6.2 out of 10 from 250 votes. A critics' rating of 4.7 out of 10 from eight reviews sits slightly below the IMDb audience figure and well under the more favourable TMDB score.
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