Over the course of Godzilla's long history, alien races from other worlds have often attempted to take over the Earth for their own purposes; often with Kaiju of their own.
To return to the main character index, go here. For alien races from Godzilla: Planet of the Monsters, go here.
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In general
- Alien Invasion: All of them always want to take over Earth, usually by using kaiju or mechas to achieve that goal.
- Aliens Are Bastards: It's pretty much a rule for alien races in the Toho verse to be invading jackasses who want to take over Earth and subjugate humanity. The only exceptions to this rule have been the Venusians, who thanks to King Ghidorah are extinct (save for their Half-Human Hybrid descendants hidden across the Earth), and the unnamed aliens who created Godzilla in the original script for TriStar's Godzilla Movie.
Cryog
First appearance: Godzilla: Rulers of Earth, 2013
An alien race featured in Godzilla: Rulers of Earth. Let's just say they have big plans for Earth.
- Canon Foreigner: They are the first original alien race featured in the IDW Godzilla comics, along with the Devonians.
- Crown-Shaped Head: The Cryog emperor possesses crown prongs growing from his head. It's implied to be the trait specific to the Cryog's royalty, if Rhizon's comment is any indication.Rhizon: You've never deserved to grow that crown.
- Expy:
Word of God states they were originally supposed to be the Space Hunter Nebula M aliens, but they couldn't get the rights, so they substituted an original race in their place. - High Collar of Doom: The emperor of the Cryog has two frills on the sides of his body that give off the appearance of a spiked collar.
- Homeworld Evacuation: Their planetary civilization was destroyed by King Ghidorah in the past, rendering them an entirely spacefaring race seeking a new homeworld.
- No Honor Among Thieves: They allied themselves with the Devonians to conquer the Earth but planned to betray them from the very beginning. But the Devonians easily saw that coming...
- Octopoid Aliens: They have a very squid-like look to them, with curly, tentacled appendages instead of jointed limbs.
- You Have Outlived Your Usefulness: They plan to betray the Devonians when they see fit. Too bad the Devonians betray them first.
Devonians
First appearance: Godzilla: Rulers of Earth, 2013
An alien race that appears in Rulers of Earth along with the Cryog. They have lived under water for centuries, until the Cryog approach them for an alliance.
- Ancient Astronauts: They crash-landed on Earth a few centuries ago and established a civilization beneath the ocean.
- Expy: Word of God states they were originally supposed to be the Seaptopians, but they couldn't get the rights, so they substituted an original race in their place.
- Fish People: They look a little like an entire race of Creatures from the Black Lagoon.
Dianii
First appearance: Godzilla: King of the Monsters (Dark Horse) #5
A race of alien hunters that came to Earth on the trail of the alien bat Kaiju Bagorah. After seeing their quarry being chased off by Godzilla they decided that the King of the Monsters would be a much more worthy hunt.
- Our Giants Are Different: They have an average height of twenty-five meters (82.021 feet) which brings them closer to Godzilla's weight class.
- Proud Hunter Race: Unlike other aliens who seek to use the Kaiju as weapons for galactic conquest, the Dianii prefer to hunt them for sport.
Kilaaks
First appearance: Destroy All Monsters, 1968
Film Appearances: Destroy All Monsters
Played by: Kyoko Ai
Yet another species of aliens attempting to invade the Earth. They hail from planet Kilaak, a world within the asteroid belt. Their 1999 invasion in Destroy All Monsters is the last faced by Earth in the original Godzilla continuity, making them the Final Boss for the Showa series. They're quite open about their plans right from the beginning, and are well-versed in Mind Manipulation for humans and kaiju alike.
- All Your Base Are Belong to Us: They take over Monsterland and Earth's moonbase right off the bat, using them as two of their chosen bases for their invasion of Earth.
- Amazon Brigade: All Kilaaks seen onscreen are women, but they do make mention of male Kilaaks.
- Dissonant Serenity: They spend almost their entire time onscreen calmly explaining their plans, then executing them. They turn out to be Not So Stoic when their moon base is taken down, but it's a pretty subdued reaction of horror.
- Flying Saucer: Their chosen mode of transport. Interestingly, they only seem to have one weapon; see Wreathed in Flames below.
- Human Aliens: Though their "Women in silvery clothes" form is heavily suggested to be A Form You Are Comfortable With.
- Knockout Gas: Have a prediliction for it; theirs is a thick yellow smog that's effective enough to take down Kaiju in big enough doses.
- Lack of Empathy: They claim "certain sacrifices must be made" to build their new civilization, not caring that those "sacrifices" are thousands of innocent lives on Earth.
- Mind-Control Device: They have an extremely powerful one on the moon, but it needs smaller relay devices spread across the planet to be effective. They're also the first aliens in the series shown to use mind control on humans, using even smaller relay devices on the victim's person (or in one case, in her earrings).
- Silicon-Based Life: They need extremely high temperatures to survive, and will turn into gray slug-like creatures if it drops to normal human levels.
- Smug Snake: The Queen radiates this attitude in all her scenes, always speaking in a condescending tone even as the odds start to turn against her favor.
- Some Kind of Force Field: They can summon these, and presumably use them so their human pawns can survive in the same room as them.
- Wreathed in Flames: Not they themselves, but at least one of their flying saucers has the ability to engulf itself in flames for a form called the "Fire Dragon". It's hot and nimble enough to knock Rodan out of the sky.
Millennians
First appearance: Godzilla 2000
A race of aliens that had lost their physical forms prior to Godzilla 2000, now believing Godzilla's healing factor is the key to regaining them
- Ancient Evil: Their vessel crashed into the ocean millions of years ago, and they've been waiting for a very long time to get back out.
- Gone Horribly Right: They wanted to restore their physical forms with Godzilla's Organizer/Regenerator G-1, it mutated them into Orga instead.
- Haunted Technology: Exactly what happened to them after their vessel crashed is a bit nebulous, but by the modern day, they’re still inside their vessel and controlling it, though their physical bodies are long gone.
- Hive Mind: After obtaining enough of Godzilla’s genetic code, they combined their minds into a single gigantic individual, which was able to survive in Earth’s atmosphere. Unfortunately, the individual began to mutate uncontrollably, and their consciousnesses were warped into a single entity: Orga.
- Hollywood Hacking: They can easily hack into human computers and databases and “drain” them of all information.
- Inscrutable Aliens: Compared to other aliens in the franchise, at least. They never attempt to make direct contact with humanity, are extremely hostile, and their goals can only be guessed at from their actions. After morphing into Orga, it's debatable whether they're even intelligent anymore.
- Sealed Evil in a Can: After their ship sank to the bottom of the Pacific Ocean, it was slowly sealed within an enormous stone by oceanic sediment. A number of scientists came across it, and took it up to the surface for study…
- Starfish Aliens: Their true forms are never seen, but the strange jellyfish-like entity they amalgamate into is implied to at least resemble them.
M Space Hunter Nebula Aliens
First appearance: Godzilla vs. Gigan, 1972
Film Appearances: Godzilla vs. Gigan
Played by: Zan Fujita (Fumio Sudo), Toshiaki Nishizawa (Kubota)
Aliens that resemble giant, sapient cockroaches, survivors of a world that was much like Earth and which evolved sentience after its equivalent of humanity killed itself off through rampant pollution. They came to earth with plans to wipe out the human race and settle there themselves because, while they could survive in the pollution of their homeworld, the planet was so badly damaged it was dying and would soon no longer be able to support even their existence.
Kaiju minions: King Ghidorah, Gigan.
- Ancient Astronauts: In Godzilla: Rage Across Time it's revealed that they were actually the Mongols (and the "divine wind" which drove them away from Japan was Godzilla).
- Cockroaches Will Rule the Earth: They came to rule Space Hunter Nebula M after the previous human-like race died out.
- Creepy Cockroach: Another in a long line of hostile alien invaders to Earth and their true forms resemble man-size roaches.
- Intelligent Gerbil: They're aliens that look exactly like human-sized cockroaches.
- Invading Refugees: Their homeworld is gradually being polluted beyond habitation for even cockroach people, so they decided to invade Earth because it's similar to their homeworld before it got so polluted.
- The Shadow Knows: How their identity is revealed.
- Shapeshifter: It's ambiguous as to how exactly the aliens assume human form, but this is the most likely candidate.
- Stupid Evil: To an extent as it's a Fatal Flaw, as their overreliance on technology ends up overruling common sense at times, such as giving Gengo cigarettes with transmitters in them instead of asking for his home address, thinking the heroes escape in a car (not realizing it could be a decoy) and most fatally, assuming the heroes would launch an attack via the Godzilla Tower elevator, realizing too late that they just shot an elevator full of explosives that kill them all.
- They Look Like Us Now: They wear flesh-suits created from human bodies to disguise their true roach forms, but only in the English dub. In the Japanese dub, they're using holographic disguises of deceased humans, hence why their shadows still reveal their true forms.
- Villain Team-Up: In Godzilla vs. Megalon, they help the Seatopians with their destruction of the surface humans by sending Gigan over to partner up with Megalon. In Godzilla Island they also send Gigan over to help with a Xilien attack.
Mysterians
First appearance: The Mysterians, 1957
Film Appearances: The Mysterians
Played by: Yoshio Tsuchiya
A species of aliens from the now-lost planet of Mysteroid, which became the asteroid belt after their nuclear war obliterated it a few thousand years ago. The modern Mysterians are still suffering severe long-term genetic illnesses from the fantastic amounts of Strontium-90 in their bodies. They try to take over the Earth partly in a desperate attempt to preserve their people and society, and partly to interbreed with humans in order to repair their disintegrating genetic code.
- Bitch in Sheep's Clothing: They initially put on a show of being harmless and desperate refugees looking to settle on Earth. Unfortunately, they start seriously overstepping their boundaries again and again, and the whole situation ends with them admitting they pretty much just planned on an Alien Invasion from the beginning.
- Color-Coded Characters: Their leader is dressed in red, his underlings are dressed in yellow, and the grunts wear blue.
- Dishing Out Dirt: They somehow cause a few sinkholes to open up around their base during a battle against human forces, sucking down several tanks and their crews. It's hinted that the Moguera might have done this.
- Disintegrator Ray: White-colored ones with a blue core. Their main weapons, they come in handheld and mounted varieties. There's also a massive one atop their base.
- Elaborate Underground Base: Very large, very elaborate, topped with a massive dome that can emerge from underground and retreat into the earth. The dome contains an entrance to the base, and itself is topped with a particularly massive energy ray.
- Even Evil Has Standards: When the war starts, they're decent enough to ask humanity to refrain from using nuclear weapons, because they will retaliate in kind — and given that their arsenal was enough to turn their homeworld into an asteroid belt, that's something neither side wants. Even when they eventually lose, they simply leave the Earth and never come back.
- Faceless Goons: They never take their helmets off, the only Mysterians we see without them are already dead. It's hinted that the helmets contain some kind of life-support system. A small area around their noses is the only visible part of their faces.
- Flying Saucer: Theirs are roughly the size of a fighter jet, and pitch-black, with three fins on the back.
- Human Aliens: Well, human with extensive radiation burns across much of their bodies, anyway.
- Invading Refugees: Their home planet is pretty much obliterated, and their Martian colonies are about spent of natural resources.
- Making a Splash: They somehow cause a nearby river to flood the area around their base at one point, wiping out part of the army sent to attack them.
- Mars Needs Women: It seems their genetic makeup has been devolving for generations as an aftereffect of radiation poisoning after the nuclear war. They seek to make a race of human-Mysterian hybrids to keep their people alive.
- Robeast: Their tunneling "Moguera" robots.
- Technicolor Science: The equipment and machinery in their bases is surprisingly colorful.
- When Things Spin, Science Happens: Many of the machines in their base are constantly spinning, though exactly what they're doing is never actually explained.
Simeans
First appearance: Godzilla vs. Mechagodzilla, 1974
Film Appearances: Godzilla vs. Mechagodzilla | Terror of Mechagodzilla
Played by: Goro Mutsumi
A species of ape-like aliens from a planet that's progressively getting sucked into a black hole. They arrive with their superweapon Mechagodzilla in 1973 in Godzilla vs. Mechagodzilla, only to have their plan thwarted. They make another crack at it in Terror of Mechagodzilla. They also return in the Dark Horse comics, and the IDW series.
- Alien Blood: Their blood is a grayish-green color.
- Elaborate Underground Base: Their chosen hideout for both their invasions of Earth.
- Engineered Heroics: How they recruit Dr. Mafune to their cause; they offer to save his daughter's life with their technology after she's mortally wounded in a lab accident. It's heavily implied that they engineered the accident in the first place.
- Holographic Disguise: They have them in their first appearance (and in the Dark Horse comics) to blend in with humans.
- Invading Refugees: Their motivation for invading Earth is because their home-world is gradually being sucked into a black hole.
- Killer Space Monkey: In their first appearance and both their comics appearances.
- Large Ham: Have a tendency towards this, setting them apart from the flat, emotionless Xiliens and the calm, polite Kilaaks.
- Red Right Hand: The disguise of their supreme leader, Kuronuma, is imperfect, with some of his ape skin showing through his face as a dark patch behind his eye.
- This Was His True Form: When they're killed, their disguises fizzle out to reveal their real ape-like appearances.
- You Don't Look Like You: They resemble green-skinned apes in their first appearance, but oddly, more closely resemble radiation-burned humans once their masks are pulled off in Terror of Mechagodzilla.
Space Amoeba
First appearance: Space Amoeba, 1970
Film Appearances: Space Amoeba
Voiced by: Ichiro Murakoshi
A strange amoeba-like entity that took over the automatic Helios-7 Space capsule while it was en route to Jupiter. It sent the capsule back to Earth, where it splashed down off the coast of Sergio Island. It possessed a local sea monster named Gezora, and began a campaign of terror that involved controlling and mutating several local animals, and even a person. Why? To Take Over the World, of course!
- Asteroids Monster: When Ganimes is blown apart by explosives, the alien is split into three parts. This just lets it take over more individuals at once.
- Eldritch Abomination: It's surprisingly difficult to pin down exactly what the Space Amoeba really is. It seems to be somewhere between a Blob Monster and an Energy Being, with a host of bizarre powers and abilities. It definitely has the look and name of a Lovecraftian creation down.
- Eldritch Transformation: Can do this to animals it possesses. It seems to be able to turn this ability on and off at will. It's hinted that it possessed a couple of crabs to turn them into Ganimes, and a turtle to transform it into Kamoebas.
- Kill It with Fire: Extremely high temperatures are the only known way to really destroy the alien for good.
- Maker of Monsters: Can possess animals and turn them into kaiju.
- Mind Hive: The original English dub has the Amoeba explain themselves as being "a colony of Astro-Quasars".
- Power Echoes: The Space Amoeba's has an echoing voice, even while speaking through a human being.
- Puppeteer Parasite: Space Amoeba's favorite M.O., it can take over people, machines, and animals, and even kaiju, since it's hinted Gezora was a giant before Yog even showed up.
- Red Right Hand: After being taken over by the alien, Obata quickly develops Creepy Shadowed Undereyes.
- Weaksauce Weakness: Sonar waves — even those produced by animals — can disrupt its hold on its victims. Gezora is forced to retreat after running into a pod of dolphins. Later, Kamoebas and Ganimes are driven mad by a swarm of bats. Obata is forced to try to burn every bat on the island in their caves.
Venusians
Film Appearances: Ghidorah, the Three-Headed Monster
The people of Venus, who were savaged by King Ghidorah in the Back Story.
- Homeworld Evacuation: The only ones to survive Ghidorah's rampage did so by fleeing their planet.
- Racial Remnant: Some of them conceived Half-Human Hybrid children after going to Earth, but the pureblooded Venusians are long-gone and their remaining descendants are indistinguishable from humans and don't even seem to be aware of their heritage.
- Token Good Teammate: They are the only aliens in the franchise to never have the remotest intention of harming or subjugating anyone on Earth. Part of the reason Ghidorah hurt them so badly was because they were a peaceful people unprepared to defend themsleves.
Vortaak
Voiced by: Ellen McLain
A race of warmongering aliens from the Pipeworks ''Godzilla'' Trilogy who plunder planets for resources. It's what they do. With Earth, they've found a much more effective way of conquest: controlling the kaiju. After their first defeat, their queen Vorticia personally oversees the second and third invasion attempts.
- Big Bad: Serve this role in Destroy All Monsters Melee and Save The Earth.
- Big Bad Wannabe: Zigzaged in Unleashed. In most campaigns they're demoted to this status by Spacegodzilla, reduced to one of several factions fighting over the fate of the Earth. But if you play as a Kaiju from the Alien faction and beat the game, they'll win in the end and conquer the Earth for themselves as they enslave humanity. Unless you get the Titan Ending, in which case their own Kaiju will turn against them and destroy the planet.
- Composite Character: While the Vortaak are an original race created for the Pipeworks Godzilla games, elements of them are taken from various other alien races from the Showa era. Their Planet Looters motivation and general design aesthetic resembles the Xiliens, they created the original Mechagodzilla like the Simians, and them being Gigan's masters who the Seatopians form an alliance with is reminiscent of the Space Hunter Nebula M Aliens.
- God Save Us from the Queen!: Vorticia is the Queen of the Vortaak and the Big Bad of Save The Earth and Big Bad Wannabe of Unleashed.
- Laughably Evil: The Vortaak soldier in Destroy All Monsters Melee is not exactly good at announcing his race's intentions to conquer Earth.
Xiliens
Click here to see the Xiliens in Godzilla: Final Wars
First appearance: Invasion of Astro-Monster, 1965
Film Appearances: Invasion of Astro-Monster | Godzilla: Final Wars
Played by: Yoshio Tsuchiya (Showa), Kazuki Kitamura (Millennium)
A race hailing from the mysterious Planet X which, just like all other alien races in Godzilla canon, have come to conquer the Earth for themselves (and enslave mankind on top of that), using mind-controlled kaiju as their primary means of invasion.
- Bitch in Sheep's Clothing: In both appearances, the Xiliens put on a guise of peace when they show themselves to mankind, only to reveal their intentions were hostile from the very beginning later on.
- Bizarre Sexual Dimorphism: In Invasion of Astro-Monster, all Xillien women look exactly alike.
- Boldly Coming: Sometime in the past, Millennium Xiliens and humans interbred, creating super-powered hybrid mutants to those that inherited these crossed genes.
- Breakout Villain: Initially just a one off villainous faction in their first appearance, the Xiliens have grown to become the most popular alien species in the franchise to the point of returning for Final Wars and being prominently featured in other Godzilla media such as the IDW Comics, various video games and the Pinball game.
- Engineered Heroics: In Final Wars, they teleported away all the kaiju that were attacking the Earth and declared they had saved mankind, but not revealing that they had been controlling the monsters the whole time.
- Even Evil Has Standards: Although in the end he still wanted to conquer the Earth and harvest humans for their mitochondria, the Xilien Commander in Final Wars wanted their invasion to be as nonviolent as possible and discreetly taking humans for harvesting. Unfortunately, his subordinate didn't have the same morals, killing him, and taking over the planet by a show of destructive force and then intending to enslave the survivors as livestock.
- Humanoid Aliens: The Final Wars iteration wear human disguises over their real bodies, which sort of resemble bio-mechanical Fish People.
- Rubber-Forehead Aliens: The Showa version, which resemble extremely pale humans with mechanical implants. All they have to do is tan themselves and they can easily pass off as a regular human.
- Flying Saucer: The Showa Xiliens use them as their primary mode of transport.
- Machiavelli Was Wrong: This is precisely why the Controller's more direct approach to conquering Earth failed. He assumed the human race would be completely subjugated by the combined might of the kaiju and the Xiliens' fleet. Instead, it only made the remaining survivors more determined to see him taken down, even resorting to releasing Godzilla to indirectly help them.
- The Starscream: The Controller in Final Wars kills his superior when he felt bored of the nonviolent invasion plans.
- This Was His True Form: Downplayed. When the Millennium Xiliens are killed their human disguises messily burst open to reveal their true inhuman appearances underneath.
- They Look Like Us Now: Both incarnations put on human disguises. The Showa version are very pale and tan themselves to pass off as human, while the Millennium version wear artificial human skins in order to appear more amicable to the actual humans.
- To Serve Man: The Final Wars versions intend to make humanity into their personal cattle and harvest their mitochondria.
- Token Heroic Orc: The Showa Xiliens have Namikawa, who was sent to Earth as a spy, but came to sincerely care for her human lover and eventually reveals the Xiliens' secret weakness to him, resulting in her execution but allowing the invasion to be thwarted. It is implied there are other more peaceful Xiliens on their homeworld however.
- Translator Microbes: The Showa Xiliens use a universal translator to communicate with humans.
- The Unblinking: The only detail that reveals the Millennium Xiliens as not really being humans while they're disguised is the fact they don't blink.
- Weaksauce Weakness: The Showa Xiliens are extremely vulnerable to certain high-frequency sounds, which can paralyze them with pain.
- Worthless Yellow Rocks: Gold is so common on Planet X that it's basically dismissed as junk. Water, on the other hand, is rare and valuable enough that it's their primary incentive to invade Earth.
