Godzilla vs. Megalon

Godzilla vs. Megalon is a 1973 film about an undersea nation that sends Megalon to destroy the world above where he fights with Godzilla and a size-shifting robot.
 * Directed by Jun Fukuda. Written by Takeshi Kimura.

Underground Horrors Attack! (taglines)

Dialogue

 * [Last lines]
 * Inventor Goro Ibuki: [speaking into the Miniature Control Transmitter] Jet Jaguar, lets go now.
 * [An idle Jet Jaguar nods in response and walks away]
 * Hiroshi Jinkawa: Oh? What's the matter with him?
 * Inventor Goro Ibuki: Dunno...I guess he decided his job was done. But still, I reckon he'd do it again, if the need ever rose again.
 * Hiroshi Jinkawa: Well, let's just hope that it doesn't. We'll warn the scientists to be more careful in the future, and let Seatopia rest in peace.
 * Rokuro 'Roku-chan' Ibuki: [starts to catch up with Jet Jaguar] Hey! Hey! Jet Jaguar!

Taglines

 * Titan against Titan! Giant against Giant, in the most spectacular battle yet!!
 * Underground Horrors Attack!

Cast

 * Katsuhiko Sasaki — Inventor Goro Ibuki
 * Hiroyuki Kawase — Rokuro 'Roku-chan' Ibuki
 * Yutaka Hayashi — Hiroshi Jinkawa
 * Robert Dunham — Emperor Antonio of Seatopia