- HD 1080
- Runtime: 82m.
- Status: Released
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- Languages: ja
- Country: Japan
- Director: Jun Fukuda
- Stars: Katsuhiko Sasaki, Yutaka Hayashi, Hiroyuki Kawase, Kanta Mori, Kotaro Tomita
- keywords: underground world, japan, kidnapping, giant monster, giant robot, robot, alien invasion, stock footage, gojira, kaiju, tag team, monster island, godzilla, tokusatsu
- Production_studio: TOHO, Toho Eizo Co., Tokyo Laboratory
- Slogan: Dreaded Megalon from the undersea kingdom!
- providers: Max, Max Amazon Channel, Criterion Channel
- The Godzilla vs. Megalon is featured in the top rankings of 1973
- #11 in Top Family Movies of 1973
- #11 in Top Adventure Movies of 1973
- #8 in Top Fantasy Movies of 1973
- #33 in Top Action Movies of 1973
Inventor Goro Ibuki creates a humanoid robot named Jet Jaguar. It is soon seized by an undersea race of people called the Seatopians. Using Jet Jaguar as a guide, the Seatopians send Megalon as vengeance for the nuclear tests that have devastated their society.
