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 … Katsuhiko Sasaki, Hiroyuki Kawase, Yutaka Hayashi, Robert Dunham, Kotaro Tomita, Ulf Otsuki, Gentaro Nakajima Added on HBO 2023-06-27, leaving 2024-10-01. Youtube Trailer