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A group of Seatopians
Leader Emperor Antonio
Pawns Megalon, Gigan, Jet Jaguar (temporarily)
Average height 2 meters[1]
Average weight 100 kilograms[1]
Homeworld Earth (Seatopia)
Allies M Space Hunter Nebula Aliens
Enemies Humanity
First appearance Latest appearance
Godzilla vs. Megalon (1973) Godzilla vs. Megalon (2023)

The Seatopians (シートピア海底人,   Shītopia Kaitei Hito, lit. Seatopia Seabed People) are a race of underground people which first appeared in the 1973 film Godzilla vs. Megalon.

With nuclear tests on the surface ravaging their underground kingdom, the otherwise peaceful people of Seatopia decided they had no choice but to declare war on humanity and sent their guardian monster, Megalon, to lay waste to the surface world. The Seatopians also stole Jet Jaguar to aid their assault on the surface, using the robot to guide Megalon to Tokyo and watched closely as the destruction of Japan mounted. After learning that the humans regained control over Jet Jaguar and were planning on recruiting Godzilla to stop Megalon, the Seatopians contacted the M Space Hunter Nebula Aliens, obtaining Gigan for their use. Ultimately, their assault on the surface was thwarted when Godzilla and Jet Jaguar repelled the evil monster duo, forcing the Seatopians to end their war with humanity.


Showa era

Godzilla vs. Megalon

Emperor Antonio contacts his agents on the surface in Godzilla vs. Megalon (1973)

The Seatopians are an illustrious race, ruled by Emperor Antonio. They were the first civilization to inhabit the Earth, and reside in a huge subterranean country called Seatopia, home to massive underground and underwater cities which resemble those constructed by the people of Ancient Greece, the Roman Empire, and Easter Island. Seatopian history can be traced back as far as at least 3,000 years ago, when the nation of Lemuria sunk into the ocean, which eventually evolved into the subterranean Undersea Kingdom of Seatopia. Their technology quickly surpassed that of the surface world's, with the Seatopians generating their own oxygen and even constructing an artificial sun. Following the dawn of the Atomic Age on the surface, the Seatopians watched with anger as humans destroyed the Earth they believed belonged to them alone. At first, the race remained quiet, despite the mounting damage to their underground cities as a result of nuclear tests on the surface. The final straw came when a massive test undertaken near the Aleutian Islands near Alaska in the 1970s sent a huge earthquake across the Pacific Ocean, simultaneously destroying Monster Island and inflicting massive damage to Seatopia's capital city.

Because their nation lacked the numbers to defend themselves, agents of Seatopia were dispatched to steal the robot Jet Jaguar from Goro Ibuki, Hiroshi Jinkawa, and Rokuro Ibuki, planning on using it to aid their coming assault on the surface; while initially unsuccessful, the Seatopians did plant listening devices in the lab and later listened in as Goro continued working on the robot. Upon hearing that Jet Jaguar had been completed, the Seatopian agents stormed the lab again and knocked Goro, Hiroshi, and Rokuro unconscious before contacting Emperor Antonio in Seatopia. The Seatopians looked to their god, Megalon, for assistance in their war with the surface and planned on using Jet Jaguar to lure Megalon to specific locations they were targeting. Antonio and his people held a ceremony to awaken Megalon, who promptly journeyed to the surface. Meanwhile, Hiroshi learned of the Seatopians' plans and battled more Seatopian agents to rescue his allies while Jet Jaguar led Megalon to Tokyo. Hiroshi and Goro managed to free Jet Jaguar from Seatopian control, subdued the agent occupying their lab, and ordered Jet Jaguar fly to Monster Island to recruit Godzilla in the fight against Megalon. Learning of this turn of events, Antonio contacted the M Space Hunter Nebula Aliens and requested the assistance of their own monster, Gigan. Godzilla and Jet Jaguar proceeded to team up against the combined efforts of Megalon and Gigan. After a long battle, Gigan fled back into space while Megalon retreated back to Seatopia. Accepting defeat, Antonio and the Seatopians sealed the fissures they used to send their agents and Megalon to the surface, thus ending their war with the surface. In the aftermath, Hiroshi and Goro understood that the Seatopians only attacked the surface because they were threatened by humanity's own recklessness, and hoped that humanity could avoid similar conflicts in the future.

Reiwa era


Megalon, Gigan, and Little discussed the history of Seatopia and its people, describing it as a utopia ruled by King Antonio. After the continent of Lemuria sank into the ocean, its inhabitants relocated to a hollow space in the Earth dug by Megalon's grandfather, whom the people regarded as their savior and established Seatopia as their new home. In the present, Megalon has undergone intense training to become a worthy guardian of the Seatopians.

Godzilla vs. Megalon (2023)

The mysterious woman in Godzilla vs. Megalon (2023)

In a vast underground cavern, a mysterious woman heavily implied to be Seatopian observed Gigan Rex's corpse as energy was being siphoned from into something shrouded in darkness ahead. Announcing that she was seeking retribution upon the surface world, the woman called for Megalon to awaken as a pair of giant eyes began to glow from the darkness. Some time later, the woman appeared on the surface outside of the military facilities housing the corpses of the Gigan Miles that Godzilla had previously defeated. Though soldiers were quick to surround her, the woman was undeterred and calmly held up an engraved stone, which began glowing before all the soldiers around her inexplicably fell unconscious. As the stone grew brighter, the ground beneath the facilities suddenly collapsed in front of the woman, who witnessed the monster Megalon emerge from the Earth and fly away.

Much later, Godzilla fought and defeated Megalon in battle by severing his horn. The mysterious woman appeared before the still body of Megalon, still holding the glowing stone as her entire body began to glow with it. As quickly as she had appeared, the woman abruptly disappeared in a flash of light. Megalon then rose to his feet, somehow completely revitalized by the woman's action. However, despite her efforts, Megalon would eventually see defeat at Godzilla's hands once more, this time for good.

Video games

Godzilla: Trading Battle

In this game, Emperor Antonio is among the various opponents who can challenge the player to a duel.

Godzilla Defense Force

In the face of a great Xilien invasion, past foes become allies, with Emperor Antonio being an unlockable ally who can join forces with the player and the Earth Defense Force against the Xiliens' monsters.



Godzilla vs. Megalon


Godzilla vs. Megalon (2023)



  • While the mysterious woman featured in the Godzilla vs. Megalon short film is never explicitly identified as Seatopian, there are a number of clues to suggest her identity. In addition to her obvious connection to Megalon and shared desire to enact retribution upon the surface world, the unidentified woman wears an outfit nearly identical to Emperor Antonio's, down to a similar belt. The engraved stone she holds also bears similarities to a 12-pointed emblem seen in Seatopia in the original film.
  • The Seatopians' intentions and motivations are unique among most other enemy races in Toho films. While most of the other aliens intended to take Earth for themselves, the Seatopians, being residents of Earth, attacked the humans because they felt that the Earth was being mistreated by them.
  • According to an interview with Chris Mowry conducted by Toho Kingdom, the Seatopians were included in early story pitches for Godzilla: Rulers of Earth, but IDW Publishing was unable to acquire the rights to human or alien characters from Toho films and replaced them with the Devonians. Likewise, the M Space Hunter Nebula Aliens were replaced with the Cryogs.[2]


This is a list of references for Seatopian. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: [1]

  1. 1.0 1.1 Godzilla Giant Monsters Super Encyclopedia (4th ed.). Kodansha. 15 March 1994. p. 31. ISBN 978-4063042702.
  2. Interview: Matt Frank and Chris Mowry - Toho Kingdom


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