Planet X

Planet X (X星 Ekkusu Sei) is the home planet of the Xiliens. It is the main setting for the space battle between Rodan, Godzilla and King Ghidorah in Invasion of Astro-Monster. Planet X is the first location outside of Earth which kaiju are shown to visit, and is to this day the only extraterrestrial location which Godzilla has visited in any of the films. It is also the place where Godzilla performs his famous "victory dance" after defeating King Ghidorah.
Details
According to Glenn's measurements, Planet X has an atmosphere with one tenth of Earth's atmospheric pressure and a gravitational pull of one third of Earth's gravity. Despite that, Godzilla, Rodan, and King Ghidorah seem to walk, jump, and fly as they would normally on Earth. It may also possess oxygen and carbon dioxide since the Xiliens and monsters are shown breathing on the planet's surface. However, the astronauts still wore spacesuits with helmets on the planet's surface, while the Xiliens and monsters may not necessarily require oxygen to breathe, so it is not certain whether or not Planet X possesses oxygen or carbon dioxide in its atmosphere.
History
- Invasion of Astro-Monster (1965)
- Godzilla Island (TV 1997-1998) [mentioned]
Invasion of Astro-Monster
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Godzilla Island
Planet X was mentioned by the Xilien Zagreth, and according to her, Planet X is not the Xilien homeworld, but merely their colony in the Solar System.
Video games
- Godzilla: Monster of Monsters! (1988) - Nintendo Entertainment System (NES) / Famicom
- Godzilla (2021) - pinball
Godzilla: Monster of Monsters!
Planet X appears as the final planet visited by the player in the game, where they must fight all the Kaiju from the previous planets plus King Ghidorah. After Godzilla and Mothra defeat all the Kaiju, the game is won. In this game, Planet X is placed beyond the orbits of Neptune and Pluto.
Comics
- Godzilla: Monsters & Protectors #1 (2021) [depicted]
- Godzilla: Monsters & Protectors - All Hail the King! #1, #4-5 (2022-2023) [mentioned]
- Godzilla vs. America: Kansas City (2025) [mentioned in "Tornado Watch"]
Godzilla: Monsters & Protectors
"Rise Up! Part 1"
A MeToob thumbnail reads "Planet X: Does It Exist?" The hypothetical planet is depicted as purple.
Trivia
- Planet X shares its name with a discredited hypothetical planet that was thought to exist beyond the orbit of Pluto.
- Planet X is referenced in Godzilla x Kong: The New Empire (2024), appearing in the name of two episode titles of Bernie Hayes's Titan Truth Podcast.
Gallery
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Jupiter and Planet X as seen from the P-1
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The landscape of Planet X, with Jupiter in the sky
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Godzilla doing his victory dance
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Godzilla and Rodan as they are left on Planet X
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Godzilla, Rodan, and King Ghidorah fighting on the surface of Planet X, with the P-1 in the background
Comments
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