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The Xiliens in Godzilla Final Wars
The Xiliens in Invasion of Astro-Monster
An Xilien's true form in Godzilla Final Wars
Leader Controller of Planet X,
Giant Dark Emperor,GI
Xilien Commander (initially),GFW
Xilien QueenGDF
Commander ZG:AHTK!
Pawns King Ghidorah,
GodzillaIoAM (temporarily),
Rodan, Kumonga, Kamacuras, Hedorah, Gigan, Monster X, Ebirah, Anguirus, King Caesar, Zilla, DogoraGI, MegalonGvMMPR, MegaguirusGvMMPR, Mecha-King GhidorahG:SS
Average height Showa: 1.8 meters[1]
Average weight Showa: 80 kilograms[1]
Homeworld Planet X
Forms True FormGFW,
Fake HumansGFW
Allies M Space Hunter Nebula AliensGI
Enemies Humans, Godzilla, RodanIoAM, MothraGFW
First appearance Latest appearance
Invasion of Astro-Monster Godziban

The Xiliens ( (エックス)星人,   Ekkusu Seijin, lit. "Planet X People") are a race of extraterrestrials who first appeared in the 1965 Godzilla film, Invasion of Astro-Monster.

Hailing from Planet X located just beyond Jupiter, the Xiliens are a technologically advanced race bent on conquering the Earth for themselves. In Invasion of Astro-Monster, the Xiliens pretended to be under siege by Monster Zero, their name for King Ghidorah, and reached out to humanity for assistance. After humanity allowed them to bring Godzilla and Rodan to Planet X to stop King Ghidorah, they revealed that Ghidorah had been their pawn the entire time and that they now had control over both Godzilla and Rodan. When mankind did not capitulate to their ultimatum that the Earth become a colony of Planet X, they unleashed all three monsters on Earth. However, human scientists were able to defeat the Xiliens using a special sound frequency and invented a device to sever their control over the monsters. Defeated, the Xiliens self-destructed their UFOs and base on Earth.

The Xiliens returned as the villains in Godzilla Final Wars nearly four decades later. Intending to harvest the mitochondria from human cells for sustenance, they again posed as allies to humanity, unleashing an army of monsters under their control before teleporting them all away. When their plan was exposed by the Earth Defense Force, the Xilien Commander was assassinated and usurped by his subordinate who became the Controller of Planet X. The Controller unleashed all of the Xiliens' mind-controlled kaiju on Earth and tried to eliminate all resistance, but the surviving members of the EDF used the Gotengo to free Godzilla from his prison in Antarctica. Godzilla swiftly eliminated most of the Xiliens' monsters before the Controller summoned his ultimate weapon, Monster X, to stop him. The Gotengo breached the Xilien Mothership and its crew were able to defeat the Controller and his minions. In a final act, the Controller set the Mothership to self-destruct, but the Gotengo was able to escape in time and help Godzilla overcome Monster X's final form, Keizer Ghidorah.

The Xiliens are very popular antagonists in the Godzilla franchise and Toho's most famous alien race, having been featured prominently in films from both the Showa and Millennium series. Outside of their two film appearances, the Xiliens are frequently featured as the villains of various pieces of non-film media. They appear in video games such as Godzilla: Monster of Monsters! and Godzilla Defense Force, and are the recurring antagonists of the 1997 television series Godzilla Island. Furthermore, they have appeared in several of IDW Publishing's Godzilla comics. Additionally, the Xiliens are the inspiration behind the Exif race in the GODZILLA anime trilogy.


The Xiliens are referred to as "Planet X People" (X星人,   Ekkusu Seijin) in the Japanese dialogue for both Invasion of Astro-Monster and Godzilla Final Wars, referencing the name of their home planet, Planet X. In most Japanese publications, including Godzilla 1954-1999 Super Complete Works, the original Showa incarnations of the Xiliens are given the English name Alien X.[2] The English translation of the video game Godzilla: Monster of Monsters! refers to them as the invaders from Planet X. The Xiliens had no commonly-used official English name prior to Godzilla Final Wars, but a common nickname for them was Xians. The English dub of Godzilla Final Wars finally introduced the English name "Xiliens," a combination of "X" and "aliens," which has been subsequently accepted as the aliens' official English name. The name "Xiliens" is also used in the English subtitles for The Criterion Collection's Blu-ray release of Invasion of Astro-Monster. An alternate spelling, Xilians, is seen in the English subtitles for TriStar and Sony's DVD and Blu-ray releases of Godzilla Final Wars, as well as in concept art for the film. In Invasion of Astro-Monster, the Controller of Planet X tells Kazuo Fuji that he would call his people "Xiliens." In Godzilla Final Wars, the Xilien Commander states that the name of his race's home planet is impossible for humans to pronounce, and tells humanity to call them "Xiliens."


In Invasion of Astro-Monster, the Xiliens dress distinctly in black and gray vinyl suits. The male Xiliens wear coverings over their heads which cover all except their faces and feature a single antenna on the top and two receivers on each side of their head over their ears. They also wear thin black visors that cover both of their eyes. The female Xiliens all look completely identical, and do not wear any attire over their heads. The Xiliens look like normal humans, however their skin is extremely pale, and they must undergo artificial tanning in order to pass themselves off as humans. One Xilien appears to have metal bolts sticking out of his body when he is tanning, suggesting that the Xiliens are at least partially cybernetic. The Showa design for the Xiliens is typically used in non-film media.

In Godzilla Final Wars, the Xiliens' human-like appearances are simply a ruse. Their true forms are bizarre gray-skinned humanoids with no visible eyes, pointed heads and black veins visible all over their body. When disguising themselves as humans, Xiliens encase themselves in false human skins, which allow them to perfectly imitate human beings aside from the key observation that they do not blink. When an Xilien is killed, the human skin will split open and expose their true forms. When wearing their human skins, most of the Xiliens, including the Controller, dress in blue and black full-body uniforms with long black leather trenchcoats. The Controller himself sometimes wears a black visor over his eyes, a nod to the Xiliens' attire in Invasion of Astro-Monster. The Xilien Commander wears a more distinctive blue and black military uniform which resembles a robe.


In the Showa series, the Xiliens are an emotionless and robotic race. They lack free will and their entire lives are controlled by an advanced computer which is overseen by the Controller of Planet X. Xilien culture is extremely strict and lacks any individuality; all members of the race dress identically while every female Xilien possesses the exact same face which is held as the standard for beauty. Anyone who disobeys the orders of the computer is immediately executed without hesitation. Due to the harsh conditions on Planet X, the Xiliens seek to colonize Earth and plunder its resources. They lack any regard for human life and are willing to completely exterminate the human population if necessary, only granting humanity a window to comply with their demands for convenience. The Controller in particular seems overly confident in his race's machines, basing all of his actions on the computer's calculations and never once doubting that their invasion will succeed.

In the Millennium series, the Xiliens are a highly militaristic culture initially led by the Xilien Commander. In contrast to their Showa incarnation, this version of the race possesses more individuality through the human disguises its members wear. The Commander is very level-headed and shows restraint, attempting to operate in secret to infiltrate humanity and gain its trust so that his people can harvest human mitochondria for sustenance. Once he is usurped and murdered however, he is replaced by the much more violent and impulsive Controller. The Controller views humanity as "cattle" and seeks to use his race's military might to wipe out human civilization and enslave what remains. Under the Controller's leadership, the Xiliens are extremely aggressive and have no regard for human life.


Invasion of Astro-Monster

Upon arriving on the newly-discovered Planet X, astronauts Glenn and Fuji encountered the Xiliens, an advanced race of intelligent aliens. The Xiliens' leader, the Controller of Planet X, greeted the two astronauts and informed them that his race had an important request to make of Earth. He explained that Planet X was constantly under attack by a horrible space monster they called Monster Zero, or as the people of Earth knew him, King Ghidorah. The Controller knew that King Ghidorah had been driven away from the Earth before by the combined might of Godzilla and Rodan, and asked to "borrow" the two monsters so they could defeat King Ghidorah again. Glenn and Fuji said they would relay the Xiliens' request to Earth, and returned there aboard their spaceship P-1. While humanity debated whether or not to help the Xiliens, the aliens secretly deployed several of their UFOs to Earth to locate Godzilla and Rodan. The Xiliens finally revealed themselves to the people of Earth, and the Controller arranged a meeting with several Earth leaders. He apologized for operating without permission on Earth, but stressed the importance of their mission. With the permission of the people of Earth, the Xiliens used their UFOs to uncover the locations of both Godzilla and Rodan, then captured them both using anti-gravity technology. The Xiliens then returned to Planet X with the monsters, accompanied by Glenn, Fuji, and their superior Dr. Sakurai. When they arrived on Planet X, Godzilla and Rodan were set free and were immediately attacked by King Ghidorah. Godzilla and Rodan joined forces and quickly repelled King Ghidorah. During the battle, Glenn and Fuji slipped away to investigate Planet X further, skeptical of the Xiliens' true intentions. As they wandered the surrounding area, they encountered two Xilien women, which happened to look identical to Glenn's lover back on Earth, Namikawa. Glenn and Fuji were caught and apprehended by several Xilien guards, then brought back to the Controller. The Controller said that the two astronauts would not be punished, as they were diplomatic guests, but warned them not to cross them in the future. The Controller thanked Glenn, Fuji, and Sakurai for their assistance in making the operation a success, and gave them a tape he said contained the cure for cancer as a reward for Earth's assistance. The three men were sent back to Earth on a replica of the P-1, while Godzilla and Rodan were left behind on Planet X.

When the astronauts returned to Earth and played the tape, they discovered that it contained an ultimatum demanding that the Earth surrender to the Xiliens and become a colony of Planet X. The Xiliens revealed that King Ghidorah was under their control the entire time, and now both Godzilla and Rodan, dubbed Monster Zero-One and Monster Zero-Two, were at their disposal as well. They threatened to unleash all three monster on Earth if humanity did not surrender. In the meantime, inventor Tetsuo Torii had sold his invention, the Lady Guard alarm, to a toy company represented by Namikawa. When the company never paid or contacted Tetsuo afterward, he decided to take matters into his own hands and sneak into the company's office. However, once he arrived he was captured by the Xiliens, who were using the company as a cover for their operations. Tetsuo was thrown into a jail cell while the Xiliens' forces stationed on Earth prepared to launch their invasion. After seeing the Xiliens' women, Glenn came to the conclusion that Namikawa herself was also an Xilien and confronted her. She confessed that she was ordered to pose as Glenn's lover and keep an eye on him, but revealed that she had actually come to love him in that time. She said that the two of them were to return to Planet X together and marry, as the Xiliens' computer had demanded it. Glenn refused to abandon the Earth, and was arrested by some of the Xiliens' soldiers. Namikawa ran to Glenn and slipped a note into his pocket before he was taken away, but was subsequently executed for disobeying orders. Glenn was thrown into the same jail cell as Tetsuo, where he read the note Namikawa had given him. The letter revealed that the Xiliens were vulnerable to a single sound, which Tetsuo realized was the sound produced by his alarm. Having brought the Lady Guard with him, Tetsuo activated it, which incapacitated the Xilien guards. Glenn and Tetsuo took the guards' keys and escaped, then reported their success to Fuji and Dr. Sakurai. Fuji had developed a device that could sever the mind-control waves the Xiliens used to control the monsters, and collaborated with the JSDF to weaponize it as the A-Cycle Light Ray Gun. When the Xiliens grew tired of waiting for mankind's surrender, they unleashed Godzilla, Rodan and King Ghidorah across the globe. With no time to spare, the humanity began broadcasting the Lady Guard's sound on all radio frequencies, which caused havoc with the Xiliens' technology and left them helpless. This allowed the JSDF to turn the tables against the Xiliens and easily damage their hidden base on Earth. As the JSDF assaulted the Xiliens, the A-Cycle Light Ray Guns severed the Xiliens' mind control over the monsters and left them all unconscious on the ground. With the Xiliens' plan a failure, the Controller screamed that they would all escape into the future, then pressed a button that caused all of their UFOs, along with their Earth base, to explode. Once Godzilla and Rodan regained consciousness, they fought King Ghidorah once again and forced him to retreat back into space. At last, humanity was saved from the Xiliens' invasion, while Dr. Sakurai informed Glenn and Fuji that they would be returning to Planet X for diplomatic duties.

Godzilla Island

The Xiliens Zagreth and Landes in Godzilla Island
Main articles: Zagreth, Landes, Giant Dark Emperor.

When the Xiliens sought to invade the Earth in 2097 at the behest of the Giant Dark Emperor, Godzilla Island was a priority target as the destruction of the island and its monsters would leave them largely unopposed. Over the course of the operation, two bumbling agents, Zagreth and Landes, were assigned to dispatch space monsters or control the native monsters to accomplish the task. They were repeatedly foiled by Godzilla and his friends, the island's overseeing agency G-Guard, and Torema, a survivor of a planet the Xiliens had previously destroyed.

Godzilla Final Wars

The Xiliens in Godzilla Final Wars

In the year 20XX, the Xiliens launched an invasion of Earth, masking their intentions with peaceful purposes. The Xiliens were able to control any lifeform possessing a DNA base known as M-base, and their ability to alter creatures' DNA gave them control over an army of kaiju, which they unleashed across the globe: Rodan in New York, Anguirus in Shanghai, Kamacuras in Paris, Zilla in Sydney, King Caesar in Okinawa, Kumonga in Arizona, and Ebirah in Tokai. After allowing the monsters to wreak havoc, the Xiliens suddenly teleported them all away and revealed themselves to humankind, claiming to have saved them from the monsters. The Xilien Commander and his protege brought the leaders of the Earth Defense Force aboard their Mothership, and claimed that a runaway planet called Gorath was on a collision course with Earth and would destroy it unless they used their superior firepower to destroy it. The Xiliens said they wanted nothing but peace between Earth and their planet, and at their urging the United Nations was reconfigured into the Space Nations. While humanity seemed to embrace the Xiliens, tensions soon arose between the Commander and his apprentice. The younger Xilien believed that they should use their superior weaponry to crush and enslave the human race so they could harvest their mitochondria, but the Commander wanted to perform their purpose on Earth through as peaceful means as possible. In the meantime, Shinichi Ozaki and Miyuki and Anna Otonashi discovered that several high-ranking officials, including the United Nations Secretary General and the EDF's two highest-ranking members, were being replaced by Xilien impostors. They recruited the few EDF members they knew weren't compromised, including Captain Douglas Gordon, then exposed the Xiliens on Anna's talk show by shooting the Secretary General, causing his human disguise to split open and reveal his true colors. The Commander attempted to defuse the situation, but his protege simply laughed and shot the Commander in the head, killing him. He then proclaimed himself the Controller of Planet X and announced his intention to eradicate human civilization and enslave humanity to serve as the Xiliens' cattle. He took control of the EDF's mutant soldiers and set them loose against Ozaki and his allies, then returned to the Xilien Mothership to unleash all the monsters under their command, including the ancient cyborg monster Gigan.

In a short amount of time, major cities around the globe were demolished and the EDF's forces almost completely wiped out. Gordon proposed one last desperate option: amass all of the EDF's remaining forces aboard the Gotengo, then free Godzilla from Area G in Antarctica and allow him to defeat the Xiliens' monsters. The Gotengo was launched and traveled to Antarctica, while the Controller sent Gigan to destroy it. The Gotengo was able to free Godzilla, and he quickly defeated Gigan. Godzilla traveled around the world, defeating each of the Xiliens' monsters one-by-one. After defeating Hedorah and Ebirah in Tokyo Bay, Godzilla reached Tokyo, where the Xilien Mothership was flying overhead. The Gotengo then mounted an assault on the Mothership, and managed to pierce through it. The Xiliens' soldiers however boarded the Gotengo and easily killed all of its crewmembers save for Ozaki, Gordon, Miyuki, and Major Komura. The four of them were taken to the Controller, who taunted them before unleashing his trump card, Monster X, to destroy Godzilla. The Shobijin called on Mothra to aid Godzilla, so the Controller sent the upgraded Gigan to deal with her. The Controller revealed that he and Ozaki were both powerful beings called Keizer, the result of interbreeding between humans and Xiliens thousands of years ago. He used his powers to take control of Ozaki and force him to attack his allies, but Miyuki freed him from the Controller's influence using a sacred dagger given to her by the Shobijin. Ozaki told the others to escape while he fought the Controller. Miyuki, Gordon and Komura managed to free several of the Xiliens' captives, who had ben replaced with Xilien impostors on Earth, then fought through the Xiliens' forces to reach the Gotengo. Ozaki defeated the Controller in combat, but the Controller activated the Mothership's self-destruct sequence, refusing to let Ozaki be victorious. Ozaki ran back to the Gotengo, which escaped just before the Mothership exploded, with the Controller and the rest of the Xiliens' invasion force still aboard. However, while the Xiliens were defeated, one remnant of their invasion still remained: Monster X, who transformed into the more powerful Keizer Ghidorah. Keizer Ghidorah nearly killed Godzilla, but Ozaki used the Gotengo's Maser Cannon to transfer his Keizer energy into Godzilla, allowing him to overpower and finally destroy Keizer Ghidorah.

Reiwa era


The Xilien Lei Lei in Godziban
Main article: Lei Lei.

Godzi Godzi Island found itself regularly visited by a young Xilien invader named Lei Lei that enjoyed collecting kaiju as pets and was eager to add the Earth's cute and cool monsters to her collection. After being deterred several times, she ended up finding a monster she named Monster Zero while visiting Venus and used it in an attempt to conquer the island. However, she came at a time when the Three Dorat Brothers were also bothering Godzilla-kun and his brothers. When the Dorats fused into King Ghidorah, she had Monster Zero fight him to determine which King Ghidorah was strongest and therefore, the better pawn.


The Xiliens are a highly advanced civilization far surpassing humanity. In the Showa series, their UFOs are capable of interstellar travel at one-tenth the speed of light, allowing them to quickly and easily travel to and from Planet X. These UFOs are armed with powerful laser guns which can destroy vehicles instantly and melt metal. Some UFOs are equipped with tractor beams and can form an atomic barrier which allows them to easily transport Godzilla and Rodan through space. They also build a superior replica of the humans' P-1 spaceship after analyzing the original model. Because of the harsh surface conditions on Planet X, the Xiliens primarily make their home in a vast underground complex. They are able to access the surface through tubes which serve as elevators. As water is a precious resource on Planet X, the Xiliens must extract and produce it at dihydrogen monoxide plants. The Xiliens speak an alien language, but they have developed a universal translator which allows them to communicate with humans. The Xiliens' most dangerous technology is the electromagnetic waves they can use to control kaiju.

In the Millennium series, the Xiliens are once again highly technologically advanced. They operate primarily from a massive Mothership which itself can deploy Fighters and other UFOs. Their ships are armed with laser cannons that can deal substantial damage to even the Earth Defense Force's advanced vehicles. The Xiliens have harnessed the power of genetic manipulation which they use to alter the genome of Earth's kaiju and gain control over them. Their technology allowed them to create the cybernetic monster Gigan long ago, and in the present day they are able to immediately reactivate him and later upgrade him into a more powerful modified form. Through the use of unknown technology, the Xiliens can flawlessly impersonate any human being. The only fault in their disguises is their inability to blink.

Video games

Battle Baseball

In Battle Baseball, an Xilien serves as a pitcher for the Godzilla Megapowers team.

Godzilla: Archipelago Shock

In this game, the Xiliens ally themselves with the Black Hole Planet 3 Aliens to invade Earth.

Godzilla: Trading Battle

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


Godzilla: Rage Across Time

The Xiliens invaded the Earth in the early Cretaceous period with a UFO fleet and Monster X to try and subdue the planet's kaiju and dinosaurs in order to establish a colony for a servant race to prepare the planet for a distant future harvest. The primitive colonists were quickly destroyed, however, when Godzilla emerged from the volcano that Monster X had tossed him into.

Godzilla: Monsters & Protectors

At some point, Linival Corporation CEO Nomura formed an alliance with the Xiliens and watched Cedric Nishimura's vlogs about Godzilla with a member of their race. Though Nomura dismissed the notion that the videos would have any influence on public opinion, the Xilien warned that they still learned Godzilla to be a sensitive creature through said videos and noted that they must take caution to avoid drawing the monster's ire in their future efforts to conquer Earth.

Godzilla Rivals: Vs. King Ghidorah

The Xiliens observe Godzilla battling Kamacuras in Godzilla Rivals: Vs. King Ghidorah

In 1996, the Xiliens launched a full-scale assault on the Earth, destroying countless cities and conquering militaries with relative ease. Godzilla attempted to repel the invasion in Tokyo, but was captured by the Xiliens and brought to Xilia, an alien base established on Mars. There, Godzilla was forced to engage in monster battles in an arena for the Xilien populace, where he defeated every opponent. After several months, the Xiliens had successfully taken over much of the Earth, though humanity was able to begin fighting back thanks to combining their tech with that of the Xiliens'. After the humans discovered that the Xiliens controlled their forces through a master signal sent from Mars, a mission was launched to jam the signal with an electro-bomb weapon using the P-1 X. Meanwhile, Xilien leaders decided to send their undefeated monster champion, Monster Zero, to battle Godzilla in efforts to garner public support for their war on Earth, which has been steadily losing the support of the lower castes on Xilia. Once they defeated Godzilla, they intended to send Monster Zero to Earth to aid the war effort. As Godzilla battled Monster Zero, the P-1 X arrived on Mars and its crew battled through Xilien defenses to detonate their electro-bomb, which ultimately failed to sever the Xilien frequency to Earth. After Godzilla broke free of the power dampeners the Xiliens had used to keep him under their control, he defeated Monster Zero and destroyed the battle arena, along with the control tower the Xiliens had been using to transmit their master signal, which gave humanity a significant edge in fighting back against the invasion. After the P-1 X escaped the planet, Godzilla continued to decimate Xilia, forever stranded on Mars by the Xiliens.

Godzilla vs. The Mighty Morphin Power Rangers

The Supreme Controller of Planet X meets Rita Repulsa in Godzilla vs. The Mighty Morphin Power Rangers

After using the Multiversal Focus to find an alternate universe without Power Rangers, the evil sorceress Rita Repulsa found herself on an Earth already under siege by Xilien forces, who had sent Megalon to battle against Earth’s guardian, Godzilla. Speaking with the Supreme Controller of Planet X in the wake of Megalon’s defeat, Rita decided to ally herself with the Xiliens and help them conquer the planet, though she was dismayed to learn that Godzilla and Earth’s monsters could not be controlled by the Xiliens or herself. After the Power Rangers arrived and fought Godzilla, Rita instructed the Xiliens to continue attacking Godzilla and the Power Rangers with Xilien UFOs, sending the King of the Monsters into retreat and forcing the Power Rangers' Megazord to deactivate. The Power Rangers later boarded the Xilien mothership to free the Green Ranger, who Rita had imprisoned on the ship, at which point the Xiliens moved to the penultimate stage of their invasion plans by sending Gigan to Earth. While the Power Rangers fought against Gigan and Rita’s summoned monsters, Godzilla returned, and eventually forced Gigan into retreat. Rita demanded the Xiliens send more of their captured monsters, prompting the aliens to unleash Megaguirus, Kamacuras, and Kumonga – though all three were quickly dispatched by the combined might of Godzilla and the Megazord. Fed up with her repeated failures, Rita and her minions launched a coup against the Xiliens and took over the mothership, coercing the Xiliens to send their most powerful and uncontrollable monster to the surface – King Ghidorah. While King Ghidorah posed a grave threat against the heroes and Godzilla, the unpredictable dragon also began attacking the Xilien mothership as well, its appetite for chaos unable to be contained. During the battle, an Xilien guard would go on to assist the Power Rangers in their battle by freeing the Green Ranger, concluding that their efforts to conquer Earth had become too costly since the arrival of Rita Repulsa and the Power Rangers – but vowed that the Xiliens would eventually take the planet for themselves. Once Godzilla and the reunited Power Rangers were able to defeat King Ghidorah, Godzilla turned his attention to the Xilien mothership and attacked it, at which point Rita decided to abandon this reality and find another, using the Multiversal Focus to escape the mothership after it crashed to the ground. In the aftermath, the remaining Xiliens regrouped and prepared to retreat back to their home planet on an escape craft, only to be annihilated when Godzilla unleashed his atomic breath on them, thwarting the Xilien invasion for good.

Godzilla: Monsters & Protectors - All Hail the King!

A year after Godzilla defeated Linival Corporation’s Biollante, the Xiliens continued to monitor the Earth in secret, hoping to learn more about the giant monsters living on the planet – especially Godzilla. One Xilien, Agent Dragon, had been tasked with monitoring Cedric’s vlogs to determine if the child truly did have a connection with Godzilla as he claimed. Soon, Xilien leader Commander Z revealed that the Dream Sifter, an Xilien device used to peer into the dreams of every living creature on the planet of their choosing, was finally ready for activation. The Dream Sifter helped the Xiliens learn more about the Earth to aid in their future conquest, but also connected to a dormant creature within a volcano not native to Earth – King Ghidorah. Believing the monster to be the key to their conquest, the Xiliens ventured to King Ghidorah’s resting place with the aid of Nomura, who was paying for the operation to excavate the volcano. After using the Dream Sifter to learn more about King Ghidorah’s origins, the Xiliens awakened the monster and attached implants to its heads to control it. With Ghidorah under their control, Commander Z sent the three-headed monster to terrorize the planet while watching in secret. However, following a battle with Godzilla, the Xiliens lost control over Ghidorah, with the implants damaged beyond repair during the fight. Concerned they would lose the planet, Commander Z contacted Planet X, requesting they deploy “mechanoids” to Earth. In the aftermath of King Ghidorah’s defeat at the hands of Godzilla and King Caesar, Commander Z led the Xiliens to King Ghidorah’s unconscious body and announced his intent to create a Mecha-King Ghidorah that they would have full control over to aid in their coming invasion.

Godzilla: Monsters & Protectors - Summer Smash

The Xiliens reveal themselves to humanity in Godzilla: Monsters & Protectors - Summer Smash

Frustrated by the lack of progress in their secret invasion, the Xiliens finally decided to launch a full-scale invasion of Earth despite a lack of resources. What they lacked in numbers, they more than made up for in their superior technology, as their UFOs were able to subdue humanity's militaries within a week, which allowed them to establish a base in Hokkaido. Using psychic technology to speak directly to every human on the planet, the Xiliens declared themselves the new rulers of Earth and gave humanity one month to formally surrender, warning that they had yet to unleash the full might of their army. Despite these warnings, a squadron of warplanes was dispatched to destroy the Xilien base soon after, and while the attempt failed to penetrate the Xiliens' forcefield technology, the Xiliens announced swift retaliation in the form of releasing Mecha-King Ghidorah on Japan. As the militaries of the world engaged the Xilien army in dogfights over Japan, Mecha-King Ghidorah devastated Tokyo. However, shortly thereafter, the cyborg monstrosity was intercepted by Godzilla, Mothra, and the alien robot Jet Jaguar. Following a short battle, the trio defeated Mecha-King Ghidorah, at which point Godzilla and Mothra turned their attention onto the Xiliens themselves and destroyed their base. The surviving Xiliens were forced to end their occupation of Earth and retreat back into space, but vowed that they would one day return to exact their revenge.

Godzilla Rivals: Vs. Mechagodzilla

Plotting to expose the corruption of the technology company Tracer Tech who were responsible for forcing them out of their homes, young activists Alex and Jaz met with their friend Erina and schemed to inflate Tracer Tech’s headquarters. As Tracer Tech deployed Mechagodzilla to fight Godzilla, the trio made it inside the building and located the servers, with Erina downloading the files she needed to expose Tracer Tech while leaving behind a flash drive marked with an "X". Meanwhile, Tracer Tech learned that an unknown party had hacked into Mechagodzilla, causing it to go berserk shortly before it carried Godzilla out to sea, where the mech was downed by the King of the Monsters. In the aftermath, Erina proceeded to leak the incriminating files online before parting ways with Alex and Jaz. Once alone, Erina contacted her fellow Xiliens and discussed their plans to retrieve the fallen Mechagodzilla before the humans could do so. Elsewhere, more Xiliens prepared to send two of their pawns, Gigan and King Ghidorah, back to Earth.


Concept art

Godzilla Final Wars

Godzilla vs. The Mighty Morphin Power Rangers


Invasion of Astro-Monster

Godzilla Island

Godzilla Final Wars



Invasion of Astro-Monster

Godzilla Final Wars

Video games



  • The Exif from the GODZILLA anime trilogy are named after and inspired by the Xiliens.[3]
  • Despite driving the plot of both Godzilla: Monster of Monsters! and Godzilla Kaiju Collection, the Xiliens do not make a physical appearance in either game. However, Xilien UFOs do appear as an enemy in the former.
    • Similarly, Xilien UFOs appear in several video games in which the Xiliens themselves are otherwise absent and not mentioned, such as Godzilla, King of the Monsters for the Game Boy.
  • A story illustrated by Yuji Kaida in the March 1983 issue of Terebi Magazine features an alliance of Toho's various malevolent alien races from the Showa era called the Dark Mysterious Star Alliance, which includes the Xiliens. The invaders collaborate to construct a robot called Mecha-Ghidorah in order to conquer the Earth.[4]
  • While the Xiliens do not appear in the comic series itself, a woman cosplaying an Xilien appears on the cover of the third issue of Godzilla: Rulers of Earth.

See also


This is a list of references for Xilien. 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. 25. ISBN 978-4063042702.
  2. Godzilla 1954-1999 Super Complete Works. Shogakukan. 1 January 2000. p. 194. ISBN 978-4091014702.
  3. GODZILLA: Planet of the Monsters Theater Program. Toho. November 17, 2017.
  4. Driscoll, Nicholas (2 March 2020). "Space Super Monster Robo! Mecha-Ghidorah vs. Monster King Godzilla". Toho Kingdom.


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Era Icon - Monster X.png
Era Icon - Keizer Ghidorah.png