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.

Directed by: Jun Fukuda
Written by: Jun Fukuda
Release date: 1973-03-17
Runtime: 82 minutes
Critics score:
Tagline: Dreaded Megalon from the undersea kingdom!
Related titles:
Cast:
Katsuhiko Sasaki Katsuhiko Sasaki
Inventor Goro Ibuki 
Yutaka Hayashi Yutaka Hayashi
Hiroshi Jinkawa 
Hiroyuki Kawase Hiroyuki Kawase
Rokuro 'Roku-chan' Ibuki 
Kanta Mori Kanta Mori
Japan Special Defense Forces Chief 
Kotaro Tomita Kotaro Tomita
Lead Seatopian Agent 
Ulf Otsuki Ulf Otsuki
Seatopian Agent 
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Also known as:
  • Godzilla Vs. Megalon
  • Godzilla 13 - Godzilla vs. Megalon
  • Godzilla contro Megalon - Ai confini della realtà
  • Gorgo y Superman se citan en Tokio
  • Ιπτάμενος Υπεράνθρωπος
  • Godzilla 1980
  • At the Borders of Reality
  • Ai confini della realtà
  • Godzilla Against Megalon - At the Borders of Reality
  • Planetary Titans
  • Titanes planetarios
  • Godzilla vs. The Megalon Brothers: The Undersea Kingdom's Annihilation Strategy
  • Gojira tai Megaro Kyōdai Kaitei Ōkoku Zenmetsu Sakusen
  • ゴジラ対メガロ兄弟 海底王国全滅作戦
  • Dünyayı Titreten Canavar
  • The Beast That Shakes the World
  • King Kong — Dämonen aus dem Weltall
  • King Kong: Demons from Outer Space
  • Superman in Space
  • סופרמן בחלל
  • The Flying Superman vs. Monsters