Godzilla vs. Megalon
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.
Release Date: 1973-03-17
Katsuhiko Sasaki
Inventor Goro Ibuki
Hiroyuki Kawase
Rokuro 'Roku-chan' Ibuki
Kotaro Tomita
Lead Seatopian Agent
Robert Dunham
Emperor Antonio of Seatopia
Kenpachirō Satsuma
Gigan (as Kengo Nakayama)
Gorō Naya
Emperor Atonio of Seatopia (voice)
Haruo Nakajima
Godzilla (archive footage) (uncredited)