Monster X

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Toho Kaiju
Monster Icons - Monster X
Monster X
Monster X
Species Nicknames
Ghidorah Monster X II,
Kaiser Ghidorah
(Keizer Ghidorah)
Height Length
120 meters[1]
(Monster X)
140 meters[1]
(Keizer Ghidorah)
180 meters
(Monster X)
200 meters
(Keizer Ghidorah)
Weight Forms
60,000 metric tons[1]
(Monster X)
100,000 metric tons[1]
(Keizer Ghidorah)
Monster X
Keizer Ghidorah
Controlled by Relationships
XiliensGFW None
Allies Enemies
Godzilla, Mothra, Anguirus, Rodan, Battra, Kiryu, Kumonga, Titanosaurus
Created by Portrayed by
Shogo Tomiyama,
Ryuhei Kitamura,
Katsuya Terada
Motokuni Nakagawa (Monster X)
Puppet (Keizer Ghidorah)
First Appearance Latest Appearance
Godzilla: Final Wars Godzilla: Final Wars
ShodaiEkkusu, ShodaiKaizaa 
Monster X
Keizer Ghidorah
More Roars

Monster X (モンスターエックス,   Monsutā Ekkusu?), also known as Keizer Ghidorah (カイザーギドラ,   Kaizā Gidora?), is a skeletal Ghidorah kaiju created by Toho that first appeared in the 2004 Godzilla film, Godzilla: Final Wars.


It is possible that Monster X's name is a reference to "Monster Zero," an alias for King Ghidorah. The "X" in his name could come from the Xiliens' Japanese name, the "X Aliens."

Keizer Ghidorah's name comes from the German word "kaiser," meaning emperor, and "Ghidorah," coming from the immediate name of King Ghidorah's species.


Monster X was summoned by the Xiliens from the Gorath asteroid, which has unknown origins. Keizer Ghidorah is a form of Monster X.


Millennium Series

Godzilla: Final Wars

Monster X arrived on earth through the Gorath asteroid,and he attacked Godzilla in Tokyo. He fought Godzilla using both melee attacks and his gravity beams. He managed to harm Godzilla, until he gained the upper-hand and retaliated. Gigan tried to help with the fight, but Mothra distracted him. Later on in the battle, Mothra and Gigan were both destroyed, leaving only Monster X and Godzilla. Monster X was nearly defeated by Godzilla, but he transmogrified into Keizer Ghidorah.

Keizer Ghidorah - Keizer Ghidorah

Keizer Ghidorah in Godzilla: Final Wars

Keizer Ghidorah (カイザーギドラ,   Kaizaa Gidora?) is a form of Monster X, and he debuted in Godzilla: Final Wars. Keizer Ghidorah attacked Godzilla with his gravity beams, and threw him into the air, pummeling him. He picked up Godzilla and began to suck out his energy, but Godzilla was rescued by the Gotengo. He destroyed two of his heads, and then shot him up to space using his Spiral Heat Ray, where he exploded in the atmosphere.


Monster X's attacks include gravity beams from his three heads' eyes, melee attacks, a lot of agility, and transforming into the more powerful Keizer Ghidorah. He is also shown briefly to levitate for a short period of time. Even before transforming, he's still extremely powerful. He's a physical match for Godzilla and his gravity eye beams posses roughly the same strength as Godzilla's atomic breath. He's also the only monster Godzilla fought in Godzilla: Final Wars that survived getting blasted by Godzilla's atomic breath at point-blank in the face, actually appearing to shrug the attack off, as well as being the only one able to bring Godzilla to his knees and make him roar out in pain, with just one attack.

Like King Ghidorah, Keizer Ghidorah is able to fire Gravity beams from his mouths. These beams are stronger than Godzilla's thermonuclear breath. Keizer Ghidorah can also guide their paths and pick up and throw objects with them. Keizer Ghidorah can drain energy through his bite. In the comics, Keizer Ghidorah apparently has the ability to fly.

Video Game Appearances

Godzilla: The Game

Kaiju Guide

Monster X, the Meteorite Monster from Outer Space

Kaiju Guide Monster X

This extraterrestrial monster was created to battle Godzilla. It first emerged from a giant meteorite known as "Gorath" that landed in Tokyo. Monster X is thought to be the ultimate weapon of the Xilien invaders, who approached mankind in a spirit of friendship. A biped with two slim legs, it attacks with greater power and speed than Godzilla while boasting such durability as to comfortably withstand the impact of a meteorite collision large enough to leave a giant crater. The gravity beam shot from the red eyes on its three heads is equal in power to Godzilla's atomic breath. Upon being defeated, it undergoes a metamorphosis into Keizer Ghidorah.

This swift monster perfectly complements the furious, no-holds-barred action of "Godzilla: Final Wars" (2004).

120 meters
60,000 tons
Gravity beam
"Godzilla: Final Wars"

Keizer Ghidorah, the All-Powerful Monster from Outer Space

Kaiju Guide Keizer Ghidorah

The mutated form of the space meteor monster Monster X that emerged from the Gorath asteroid. After the Xiliens were defeated, it molted its exoskeleton, stretched its three heads, grew wings, and transformed into a powerful quadrupedal monster. Not only does it boast overwhelming combat abilities, but it also has the abilty to erect a barrier and defend against enemy attacks. It can also bite an adversary with its three heads to absorb its energy.

Keizer Ghidorah, the last monster to appear in the Japanese Godzilla series, is Godzilla's strongest rival monster. While the pre-mutation Monster X version was noted for its sense of speed, Keizer Ghidorah has a figure more massive even than Godzilla. It engaged Godzilla in an intense final hand-to-hand showdown. Its appearance was kept a secret until the release date, resulting in a delightful surprise for audiences.

140 meters
150 meters
100,000 tons
Antigravity ray
"Godzilla: Final Wars"


Godzilla: Ongoing


Monster X as he appears in Godzilla: Ongoing

Monster X appears in the IDW comic Godzilla: Ongoing alongside SpaceGodzillaGigan and Hedorah. He first appears in issue 8 where he attacks New York before fighting Mothra. After his fight, he manages to dispatch her before Boxer, Harrison and Asuka Hikari arrive in Kiryu along with Kumonga. After dispatching Kumonga, Monster X engages in a brief fight with Kiryu before SpaceGodzilla and Godzilla show up. In the battle that follows, Monster X transmogrifies into Keizer Ghidorah where he starts to gain the upper hand over the King of the Monsters. However, Rodan soon arrives to assist Godzilla, managing to decapitate one of Keizer Ghidorah's heads by creating a sonic boom from his wings. Eventually with Rodan's help, Godzilla is able to overcome and kill Keizer Ghidorah.


Main article: Monster X/Gallery.


Monster X's roar appears to have been adapted from big cat growls and roars. As Keizer Ghidorah, his roar sounds like maniacal cackling, similar to King Ghidorah's characteristic cackling roar.


  • The name "Monster X" is also used to refer to Guilala and Jiger.
  • Monster X was briefly considered for Godzilla: Unleashed, but according to Simon Strange, he was "not interesting enough," and his transformation into Keizer Ghidorah would have been too complex.
  • Shunsuke Fujita wanted to include Monster X in Godzilla: The Game, but couldn't because of time constraints.
  • Keizer Ghidorah is the second tallest main series Godzilla monster, behind the Heisei King Ghidorah and Mecha-King Ghidorah.
  • Monster X's transformation into Keizer Ghidorah was kept secret by Toho prior to the release of Godzilla: Final Wars, in order to surprise fans. To further keep Keizer Ghidorah a secret, Toho trademarked it as "Monster X II" rather than under its true name.


This is a list of references for Monster X. 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 1.2 1.3 Toho Special Effects All Monster Encyclopedia. Godzilla: Final Wars; Page 118.


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