A significant subtrope of Scary Dogmatic Aliens, the Absolute Xenophobe does not work and play well with others. Whether from instinct or acculturation, these aliens are horrified at the mere idea that other sentient life exists, and will not rest until they have annihilated every other intelligent species they know of. Differs from The Virus, Horde of Alien Locusts, Planet Looters, et cetera in that the Xenophobes don't necessarily gain anything other than a (false?) sense of security from their wars — they don't want to eat us, transform us, or scavenge resources from our planet (although that's a bonus); they just want us dead and gone.
See also the equally though less expansively genocidal Feeling Oppressed by Their Existence and Kill All Humans, and the even more extreme Omnicidal Maniac. May overlap with Dehumanization if the Absolute Xenophobe in question believes that all species not their own are inferior beings.
Some speculative fiction authors will depict a xenophobic species as herbivores who evolved from species that were preyed upon by most other animals.
If this xenophobia is a result of cultural influences, it may be possible to knock some sense into them and make peace. If this kind of xenophobia is innate, it's probably them or us. Such aliens may bear a resemblance to (or, as in the case of the Daleks, be explicitly based on) Those Wacky Nazis. Compare Hard-Coded Hostility. Contrast Intrigued by Humanity, or The Xenophile. Compare and contrast the Master Race, who may want to kill other races/species but would rather conquer them.
- Unicron, the God of Evil of the Transformers, has made it his final goal to wipe out all creation and leave nothingness in his wake so he may be at peace in an endless void. Out of eternal hate, he finds other living things appalling- save for those that worship and follow him. Even then, he's just saving them for last.
- Gah Lak Tus, the Ultimate Marvel Galactus, is a fleet of killer robots motivated by a thorough loathing of all organic life; they don't just try to kill everything fleshy, they do so in the most hideous and painful ways they can come up with. Oddly enough, this loathing is almost completely irrational. The moment Professor Xavier tries to make contact with it, it spasms with revulsion and opens fire on Earth. In the end, they defeat it by giving it a fit of horror at being mentally contacted by the entire human race. Oh, and they also shoot it with a Big Bang for good measure.
- The Termight in Nemesis the Warlock is on a perpetual crusade to wipe all non-human sapient life from the galaxy. There are Termights who object to Torquemada and his Terminators however, and he's eventually overthrown by the human resistance with help from Nemesis.
- The Daxamites of The DCU are a ridiculously xenophobic society. They ban space travel, indoctrinate their children with fears of aliens, and teach them that Daxam is their entire universe. Green Lantern Sodam Yat was a rare exception. His own parents had to brainwash him to rein him in, which backfired immensely when he broke free of it. He even chastised his own people for not getting outside help when the Sinestro Corps invaded Daxam. The place is so bad that Yat seriously considered just leaving it to Mongul and his Sinestro Corps goons because of how thoroughly they deserved that fate.
- The Kryptonians were another example from The DCU. While they weren't xenophobic to the same genocidal extent as their distant cousins, the Daxamites, they did look down on other species, and they, too, banned space travel research. That ban on space travel is why there are so few Kryptonians left — when Krypton blew up, most of the people had no means of escaping the planet (there was a space ark they could've used, but it along with the rest of the city of Kandor was shrunken and stolen by Brainiac). The only survivors were either stuck in a prison dimension, trapped in an off-world miniaturized city, or sent away in experimental, illegal spacecrafts.
- It's actually worse. The Kyptonians were all affected by the Eradicator (which is a genetic engineering project, an AI and a bunch of other things, it's complicated), the upshot of which was even if they found a way off the planet they'd just die.
- Sergeant Preus of the Superman storyline Godfall takes this to new heights, desiring to exterminate all of Metropolis for the unforgiveable sin of not being ruled by Kryptonians.
- In Runaways, while the Gibborim may have needed a pair of aliens to form the Pride, they later reveal that they despise aliens. They treat Earth as a holy temple to their "Father" (heavily implied to be God) and condemn Xavin (a Skrull) for "desecrating" it with their presence.
- The Doctor Who Magazine comics series had Danny Fisher, an apparently heroic human space-secret-agent who was actually a sadistic, psychopathic speciesist who plotted to steal the Doctor's TARDIS and use it to spread a virus that would have killed every non-Terran lifeform in the universe, throughout history.
- The Last Son:
- Graydon Creed of the Friends of Humanity added aliens and other non-humans to his anti-mutant agenda after learning to his outrage of Superman's Kryptonian origins.
- General Zod becomes this along as a Well-Intentioned Extremist after losing his love interest, Ursa, from Krypton's war with the Shi'ar, and blaming her death on all alien races; in which he generally viewed any non-Kryptonians as "primitives".
General "Thunderbolt" Ross: "Primitives"? Is that what you think of us?
General Zod: Your country holds itself up as the example for the rest of your species when it cannot even govern itself; it covets what does not belong to it, and chases shadows of threats with utterly reckless paranoia. I do not think you are primitive, Ross; I know it.
- The CSA in C.S.A.: The Confederate States of America isn't a welcoming place if you're not 100% white, traditionalist, christian, heterosexual, or male. Although they're less likely to kill you as enslave you.
- Prince Nuada, the Big Bad in Hellboy hates humans to his guts and wants to exterminate every single one.
- The Pak from Larry Niven's Known Space series. The Pak are driven by instinct to destroy ANYTHING that poses a threat to the survival of their bloodline. If it is not their speciesnote , it MUST die. Did I mention that the Protectors of their species are super strong, super intelligent, and have super senses?
- The Dyson Primes from Peter F. Hamilton's Commonwealth Saga are the definition of this. Primes exist as sentient, immobile "immotiles" and sub-sentient motile servants that can merge to create new immotiles. Immotiles control vast armies of motiles and battle each other for resources and out of instinctive paranoia, since their biological imperative for perpetual expansion means they'll always clash sooner or later (and prefer it being sooner). You can guess what happened when they started building nukes. Also, the moment one of them (Morning-Light-Mountain) discovers wormhole technology, it exterminates all others and starts building a vast fleet in order to kill off every single living thing in the universe other than itself, not capable of comprehending the notions of sharing and coexistence. In its own words: "There is only one Universe and it can only contain one life. Me." These guys had gone so far as to exterminate every plant and animal life form from their own homeworld other than themselves and their food crops.
- The Ryall from the Antares trilogy are a classic example of the instinct-motivated Xenophobe: throughout their early development, they were preyed on by another sentient species, until they went to war and wiped the egg-eaters out. They see other intelligences only as competitors, and feel a deep need to kill them all.
- One of the classic examples of this are The Foe or The Kugel from Fredrick Pohl's Heechee series. Not only do they seem to hate all other lifeforms, they are actively trying to destroy all matter in the Universe. As it turns out, however, they are perfectly willing to allow matter-based lifeforms to exist once a human convinces them that ascending to a pure energy (and thus immortal) state is highly desirable to both the Human and Heechee races.
- David Weber likes this trope a lot:
- The Achuultani of the Empire from the Ashes novels have been quartering the galaxy for seventy million years, exterminating every sentient species they can find because they believe every other sentient species would do the same to them. In their case, it's because they've been manipulated by their rogue AI overlord, who uses the ongoing state of emergency as an excuse to keep itself in power.
- The Shirmaksu (or Kangas) in The Apocalypse Troll come from the same situation as the Ryall above, reinforced by a religion which holds that God made them in His image and all other intelligences are demons in disguise.
- The Gbaba from the Safehold series appear to be instinctive Xenophobes, though we have yet to fully understand why. One character speculates that they've lost their sapience and are governed entirely by instinctive behavior.
- John Ringo's Posleen from the Legacy of the Aldenata series are this way, although they are so primative that it's more that they are locusts destroying everything in their path than actually hate filled monsters. The end results are essentially identical however. They are, however, clearly inspired by David Weber's Achuultani, since both are Absolute Xenophobic sentient crested centauroids who rely almost entirely on their computers and attack in overwhelmingly massive swarms. Also, members of both races prove to be willing to listen to reason and, upon setting up their new, less omnicidal society, adopt new names and become allies of Humanity.
- Life, the Universe and Everything:
They flew out of the cloud.
- The Krikkiters were initially unaware that there was a universe beyond their solar system. The discovery was a major shock to them. As a result, they are absolutely charming, pleasant, decent ... if whimsical ... people whose attitude towards not just life in the rest of the universe but the rest of the universe itself can be best summed up in the phrase "It'll have to go." It turns out they were manipulated into this by the supercomputer Hactar, which had been atomized when it refused to construct a bomb that could destroy the universe. It eventually changed its mind and created Krikkit's xenophobic culture so it could rectify its "mistake".
They saw the staggering jewels of the night in their infinite dust and their minds sang with fear.
For a while they flew on, motionless against the starry sweep of the Galaxy, itself motionless against the infinite sweep of the Universe. And then they turned round.
"It'll have to go," the men of Krikkit said as they headed back for home.
On the way back they sang a number of tuneful and reflective songs on the subjects of peace, justice, morality, culture, sport, family life and the obliteration of all other life forms.
— Douglas Adams, Life, the Universe and Everything
- The reason for this is that the story is recycled from an old Doctor Who script Douglas Adams wrote. The Krikkiters were Captain Ersatzes of the Daleks.
- Wowbagger of the HHGtG series could also count. Rather than wanting to wipe out all other life, he simply wants to insult it. All of it. In person. In alphabetical order. Being immortal in a universe that allows time travel, it's actually entirely possible for him to do so. (Assuming he really is going in order, he's worked his way through about 15% of the task when we meet him!)
- The Pitar in Alan Dean Foster's Humanx Commonwealth novels appeared nearly human, and held out a cautious hand of friendship at first...but this concealed a species-wide psychosis that drove them to attempt to wipe out humans, thranx, and anyone else they could find.
- From the works of Michael Moorcock: John Daker, called to an alternate earth to be the champion of humanity against their dreaded foes, the Eldren, discovered that these humans were Absolute Xenophobes, doing their best to exterminate a peaceful culture who had never done one damn thing to deserve it. He defected to the Eldren and tried to defeat humanity and strike a peace...but the humans fought to the death, every last man, woman, and child. For his "crime" against his own species, the Cosmic Balance sentenced Daker to be reincarnated again and again across a million worlds as the Eternal Champion.
- The Ekhat in The Course of Empire are utterly mad creatures, devoted not only to killing all other sentients (albeit saving some, temporarily, if they're useful as slaves), but to transforming the entire universe so that all that exists "is" Ekhat in some way. Blue and Orange Morality applies strongly here. The Ekhat kill each other freely, both in their factional conflicts and personal relations, and won't hesitate to kill themselves if it serves some purpose. Their faction politics make the whole thing even more complicated (for example, one faction, the Interdict, takes their xenophobia to such extremes that they actually fall out of the letter of this trope — they generally don't annihilate other intelligent species, because xenocide is regarded as too close contact with the alien).
- Inverted in Anne McCaffrey's Decision at Doona, where mankind's "no contact with intelligent aliens ever" policy came about when, upon the first-ever such contact in history, the alien species in question promptly committed mass suicide.
- They're not exactly aliens, but the Auditors of Reality from the Discworld series probably count. They regard life, especially sentient life, as a blight on the universe (and a major bookkeeping headache), and want to see it eradicated. Their hatred of life is such that it even applies to themselves. They aren't technically alive to begin with, but if they show any signs of individuality (such as refering to themselves as "I"), they disintegrate. The "logic" is that if something is an individual, it has an identity. If it has an identity, it is a person. If it is a person, it is alive. If it is alive, it will die someday. And from the point of view of the immortal Auditors, a mortal lifespan is so short that it might as well end instantaneously.
- A race of aliens like this appears in the Star Trek: The Original Series novel Windows on a Lost World.
- The Molothos in Ryk E. Spoor's Grand Central Arena hate all other sapients, but are forced by the Arena system to interact with them on a non-destructive basis. This does not make them any happier.
- Certain eras of the Xeelee Sequence by Stephen Baxter present the rather disquieting specter of humanity acting this way to everything else, essentially out of a deeply psychotic sense of Sibling Rivalry stemming from our second-place status to the Xeelee.
- Ender's Game:
- The buggers appear to be this, though as there is no communication until the end, it can't be confirmed. It turns out they're not this at all. Rather, they simply failed to recognize humans as intelligent life forms on their own. Given that the number of individuals in Formian society is very small, with Queens acting through hundreds or thousands of drones, they consider murder to be unthinkable. When they realized that each human they killed was an individual roughly on the level of a queen, they felt so guilty that they held no hostility towards humanity for wiping them out.
- Some of the human characters seem to skirt awfully close to this, although it's hard to tell because of the very legitimate fear that the buggers will invade a third time and finally wipe out humanity, so the 'in-principle' xenophobes don't stand out much from the people who are just afraid of annihilation. The later books in the series cover the subject in greater detail, considering whether differences in biology and mindset will inevitably lead to a conflict where one species must wipe out the other.
- The Yevetha from the Black Fleet Crisis trilogy (Star Wars Expanded Universe). They consider all other life to be vermin and their ambassadors scrub themselves clean with painful showers after any contact with other races, and eventually commit genocide against every world in their star cluster not controlled by them. This later comes back to bite them when the Yuuzhan Vong, warlike conquerors themselves, invade the Yevetha homeworld — and the Yevetha refuse outside help. The Vong drive them almost to extinction.
- Despite having not yet even formally ventured into space, the Fenachrone from the Skylark Series have spent several generations planning to conquer the universe and exterminate any sapients they may find. (They're also almost inconceivably overconfident.)
- In the Cthulhu Mythos, one has the Yekubians, who slaughtered every other intelligent race in their galaxy before heading towards ours.
- Revelation Space has the Inhibitors, a race of post-sentient machines who wipe out any species that attempt to leave their home systems - though they do it to try and retain absolute control of the Milky Way, to shepherd the Milky Way's stars through the Andromeda collision in a few billion years. Their motives have already degraded after only a few hundred million years - the Inhibitors have become much more brutal.
- In Poul Anderson's "Among Thieves" the Kolreshites are described as follows: "The Kolreshite mutation did not show on the surface. Physically they were a handsome people, running to white skin and orange hair. It was quite possible for spies to infiltrate them - but to keep up the pretense, spies had to be ready to take part in cannibalism and worse. The mutation was a psychic twist, probably originating in some obscure gene relating to the endocrine system. One might call it extreme xenophobia. It is normal for Homo Sapiens to be somewhat wary of outsiders until he has established their bona fides. It was normal for Homo Kolreshi to HATE all outsiders, from first glimpse to final destruction". The story then goes on to describe how such Absolute Xenophobes could be tricked into being TOO TRUSTING...
- In Old Man's War the Colonial Union believes that there's not enough room in the universe for more than one sapient race, and it seems like most of the other species agree at first. But then a bunch of species form an alliance called the Conclave, and invite earth, which has been kept isolated and in the dark by the CU, to join.
- The Lost Fleet series has a number of races with Blue and Orange Morality. The Enigmas appear to have evolved from beings whose equivalent of the fight-or-flight response is to hide and strike In the Back. They are utterly terrified of any alien knowing anything about them to the point of self-destructing their damaged ships before they can be boarded. They work rather well behind the scenes and are revealed to have been responsible for starting the 100-year war between The Alliance and the Syndicate Worlds. The Bear-cows are also xenophobic, themselves being aggressive herbivores. Their herd-like mentality means that anyone they perceive as a threat to the herd is eliminated with extreme prejudice. Unlike the Enigmas, the Bear-cows employ displays of aggression as their means of scaring the opponent. As such, Bigger Is Better is in full play, with their super-battleships and planetoid battlestations. Even if you're not a predator, you're still a threat to the herd in the form of competition for resources. Thus, any lifeform that they can't use is eliminated.
- In the arc that introduced them, the hat of the Posbi species in Perry Rhodan was to investigate whether sentient life encountered was "true life" — which is to say, intelligent machines with an organic brain component like themselves — or not, with the latter leading to an immediate attempt at extermination. This was eventually traced back to a fatal programming error physically embodied in a literal "hatred circuit" located on their distant homeworld; once the protagonists managed to destroy that, the Posbis became downright civilized and if anything on occasion a little overprotective.
- In Minla's Flowers and Merlin's Gun by Alastair Reynolds, the Huskers are a race of extremely hostile and powerful xenophobes that at some point in the past, emerged from dyson spheres near the galactic core and went about bombing any signs of intelligence into dust. Humanity has been stuck in a Hopeless War for thousands of years as their technological base slowly crumbled. However, the Huskers are human.
- A non-genocidal example in Arrivals from the Dark. The Lo'ona Aeo are Space Elves who are utterly incapable of being in the proximity of a sentient alien being. Most tend to faint or go catatonic. As such, they almost never deal directly with aliens. Instead, they have created a Servant Race (appropriately called the Servs) who act as intermediaries. They tend to be Technical Pacifists, but, being a Higher-Tech Species, means that they can provide their Defenders (mercenaries recruited from an aggressive alien race; humanity at the time of the series) with pretty good military tech to protect them. There is a drug that can be used by the Lo'ona Aeo to temporarily suppress their xenophobic instincts, but they have been known to overdose on it. In fact, the Lo'ona Aeo are one of the nicest races in the known galaxy and tend to stay neutral in any galactic conflict, dealing equally with everyone (although they tend not to share military technology or technology that could be used for military purposes). However, they are partly responsible for several conflicts between a number of galactic races. This stems from the fact that they tend to switch to a different race from which to recruit their Defenders every couple thousand years. Before humanity, it was the Dromi. Before the Dromi, it was the Haptors. Each former Defender race tends to have a beef with the new Defenders for losing a lucrative deal.
- This is the attitude of some of the demons in Angel. The Scourge is the best example; they would like nothing more than to purge the world of humans, vampires and impure demons. They fail to see that they likely have human blood in them as well...
- The Thirdspace Aliens in the Babylon 5 movie Thirdspace hate all other life forms in the Multiverse and according to the Vorlons they already killed thousands of species in their home universe. And now want to enter here...
- The Cylons from Battlestar Galactica (1978) are another example of absolute alien xenophobes, dedicated to wiping out all forms of alien civilizations they perceive as a potential threat, the humans being their top target.
- In The Crossing, the refugees who washed up on Thorn Beach were all fleeing from the Apex, an Ambiguously Human race that has vowed to wipe normal humans from the face of the planet.
- Doctor Who:
- The Daleks would like nothing more than to exterminate all non-Dalek life, and even remake the universe itself to serve Dalek purposes alone. They were created by Davros as a means of ending a centuries-long, hopelessly stalemated war between the Kaleds (his people) and the Thals. Davros programmed them to "survive" by any means necessary, having decided, based on the endless war, that the only way for any one species to survive is by completely subjugating all others.
- The Daleks hate each other and themselves almost as much as everyone else. They have been known to start civil wars over trivial differences, one commits suicide in the new series when it discovers that it has been tainted with foreign DNA, and a new faction can't stand its own existence because they were created by the emperor using human cells, making them even nuttier than usual. Even the Cult of Skaro, specifically intended by the Daleks to be individuals and consider new ideas, turned on their leader when he favored becoming less "Dalek" in order to ensure the survival of their race.
- Probably the most extreme example from the humans is the Last Human, Lady Cassandra. She removed bits of herself that she saw as being similiar to aliens or altered (inbred) humans. In the end, she became just a single sheet of skin with a face. To current era humans, she would be much, much more alien than many of the aliens. And just to add icing on the cake, it's stated off hand she's transgender. While absolutely no one holds this against her, it smacks of Irony that someone who wasn't born the sex they are now is so utterly obsessed with body purity.
- Sutekh the Destroyer was a Physical God and Sufficiently Advanced Alien with these tendencies. To preclude the possibility that something that could challenge him might evolve, He wanted to erase all life in the universe, down to viruses and bacteria. He started out by trying to exterminate his own race, the survivors of whom ganged up on him and imprisoned him on Earth. The conflict itself was observed by the Egyptians and became part of their mythology.
- The Daleks would like nothing more than to exterminate all non-Dalek life, and even remake the universe itself to serve Dalek purposes alone. They were created by Davros as a means of ending a centuries-long, hopelessly stalemated war between the Kaleds (his people) and the Thals. Davros programmed them to "survive" by any means necessary, having decided, based on the endless war, that the only way for any one species to survive is by completely subjugating all others.
- Subverted with the Peacekeepers. They are initially presumed to be this: however, though they are extremely xenophobic - particularly around new species - and opposed to hybrids on general priciple, they aren't really true examples of this trope in that they are more interested in conquest than genocide. However, even their usual reputation for xenophobia is largely due to regulations that not all Peacekeepers pay attention to: quite a few frontier officers and captains have been seen flirting with alien females, and some aliens and hybrids (like Scorpius) have managed to attain high office in Peacekeeper command.
- The Scarrans however, at least according to Scorpius (who, though biased, has shown a strong understanding of Scarran nature), play this trope straight.
Scorpius: They plan to exterminate the Sebaceans, but they won't stop there! Nor with Luxans, Delvians, Baniks, or a thousand other lower life-forms. They'll stop — when they're the only sentient species left. And if they discover wormhole technology before we do — the galaxy is theirs. And eventually, John, they will find Earth. Your race is defenseless. They'll be raped and slaughtered unless you help us!
- In Star Trek: Voyager, the Starfish Aliens Species 8472 are initially portrayed as the most genocidal species that Star Fleet has ever encountered. After the hostile Borg invade their home dimension, the genetically superior aliens embark on a crusade across the Milky Way to annihilate all other lifeforms, not just Borg, because they believe that their mere existence might be a threat to their purity. They mercilessly destroy billions of Borg before their invasion is halted by a temporary Borg-Voyager alliance. Several seasons later this is subverted when they are retconned into having only acted out of self-defense, and they're actually open to diplomacy.
- In Supernatural, Lucifer is the most evil of the archangels, and supremacist even by their standards (even the "good" celestials are fundamentalist racists who want to sacrifice half of the 'maggots', i.e. mankind, in the Apocalyptic showdown). His end goal is to use the Apocalypse to wipe out all of humanity because they became God's favorite children instead of him. The demons are minions he created himself to be fiercely loyal to him and further his plans, but he actually despises them even more than humans, and plans to kill them all afterwards. He considers the other gods besides his father abominations and murders most of them personally. The only major group he doesn't actively plan to exterminate are the monsters, but then he never has any interaction with them, and considering his opinion of God's other creations it's likely not a positive one. (Lucifer may just be indifferent to the monsters because they aren't actually God's creations, they're Eve's (Mother of All Monsters) children.) He wants angels alone to rule and inhabit Creation, and tries to tempt multiple celestials to join him. He finally takes it up a notch in season 13 when, during a Villainous Breakdown, he decides to annihilate all life in the universe.
- The K'kree are limited Xenophobes: they're on a genocidal crusade to wipe the galaxy clean of all carnivorous organisms. No matter whether or not said organisms pose any threat to the K'kree at all, or are even capable of metabolizing K'kree flesh, or even if they're vital to the ecosystems of worlds the K'kree have colonized: meat-eating is EVIL and must be ended at all costs. Omnivores get a pass if they're willing to go vegan; obligate carnivores are out of luck.
- During the K'kree-Hiver war the Hivers introduced meat sauce to a few K'kree colonies, they were so horrified that they sterilized the planets in question.
- The norm for most of the factions in Warhammer 40,000, where everyone hates each other enough to justify any battle between them. At the same time, they're willing to pull an Enemy Mine against a greater threat, but these are temporary alliances at best.
- The Imperium of Man has Absolute Xenophobia as a matter of official policy, and the Imperial Cult preaches the supremacy of mankind and its Manifest Destiny to conquer the galaxy. That said, some useful alien races like the Jokearo are tolerated as "protectorates," Rogue Traders are allowed to interact with (and exploit) aliens as long as it furthers the overall cause of the Imperium, the Ordo Xenos of the Inquisition studies aliens and sometimes works with them, and the Imperial government engages in diplomatic relations with some of the Eldar craftworlds and the Tau Empire. The Imperium would like to stamp out all the rival species in the galaxy, but it's barely strong enough to hold itself together, and in the case of the Tau, sometimes it's good to have some buffer states between you and threats like the Tyranids. The Ciaphas Cain novels examine this in more detail. The Imperium and the Tau do not like each other, but are not continuously at war, and Cain actually works with the aliens when their interests align, but he's also horrified at how far Tau sympathizers, including some of his fellow humans, are willing to assimilate into this alien culture. It's not just that they're eroding their sense of self, Cain's concerned that such open-mindedness could let Chaos could get its hooks in. 40k is a setting where Absolute Xenophobia can be justified.
- The other races aren't much better. Many Eldar, especially those from Biel-Tan craftworld, would happily rebuild their ancient empire by wiping out all the "lesser races" infesting the galaxy. The Dark Eldar consider all other beings livestock to be tortured for their sick amusement. The Necrons are Omnicidal Maniacs that want to purge the galaxy of all life, not just sentient creatures, though now it would be more accurate to say only some of the leaders want that, while the rest want to reconquer their old empire through galactic conquest. The Orks will happily wage war on anything that isn't Orky enough, which can include other Orks. Really, the Tau stand out for actively incorporating alien races into their empire, and even though it's usually a choice of Join or Die, the Tau are considered much more egalitarian than the others.
- Quite ironically, the least xenophobic faction in 40K is actually probably the various forces of Chaos, the Big Bad of the entire setting. Though most known for (and represented in-game by) the Traitor Marines, Chaos will corrupt and use anything: renegade Imperial Guard regiments, abhuman and mutant underclasses, heretek techpriests looking for some way to escape the orthodoxy of the Mechanicus, freedom fighters and revolutionaries who don't truly grasp the price of their new dark allies, or even entire xenos races fallen and corrupted by Chaos.
- Drycha Hamadreth from Warhammer and Warhammer: Age of Sigmar is an insane and powerful dryad who has vowed to destroy all life that is not a Nature Spirit, seeing no difference between the enemies or allies of her people.
- The Skaven's ultimate goal is to invade the surface world and kill each and every one of the "worthless" surface-dwelling races. The fact that Skaven hate non-Skaven life even more than each other is the only thing that lets them have a working civilisation at all. They're Those Wacky Nazis if they were also Rat Men.
- The Rigelian Protectorate in the Starfire universe. Their worlds were sterilization bombed to end the threat, after it was concluded that co-existence was impossible.
- The Army of the Expeditionary Force in 3:16 Carnage Amongst the Stars seeks to destroy all non-terran life in the universe. This includes non-sentient life. In case that's not blunt enough, let's be clear that their policy makes the Imperium of Man look like it cherishes and respects all life by comparison. Let's give an example of space gerbils just sort of harmlessly gerbiling around on their homeworld. Faced with this, the top ranks of the Imperium of Man would decide that these could never conceivably be enough of a threat to justify the resources it would take to destroy them, maybe even look into domesticating them. The top ranks of the Army of the Expeditionary Force would decide that they could never conceivably be enough of a threat to justify blowing up their entire star system, and they should be genocided the old fashioned way.
- The Sathar in Star Frontiers.
- Daemons in Pathfinder, though it's more about wanting to end all life than racial purity. The only reason they don't slaughter each other (much) is because they're all working toward the same end; once all other life in creation is gone, they'll most likely commit racial suicide.
- The 2nd and 3rd editions Dungeons & Dragons had the beholders, who were so paranoid and xenophobic that each individual thought that it was the perfect manifestation of ideal beholderhood, and all other beholders were inferior fakes. When a beholder gives birth, it picks out the young that look most like itself, and kills all the others. In fact, beholders might often have hated other beholders more than they hated non-beholders — enslaving relatively long-term minions wasn't uncommon, strains and individuals that were more tolerant of other beholders consistently were also more tolerant of non-beholders, and almost the only situation you'd see larger beholder alliances were when there were enough beholders around that they could ally against other beholder alliances based on prioritising which differences were most deserving of death.
- In the board game StarForce Alpha Centauri, the final scenarios are the wars of the three species of the PanSentient League (with humans the most prominent of the three) against a race known simply as the Xenophobes. Into the largely bloodless space combat practiced by the PSL, the Xenophobes introduced the tactic of artificially inducing novas in the suns of inhabited systems. In the end, the PSL wound up wiping out the Xenophobes.
- Xenoblade Chronicles X: There are a lot of xenophobic individuals living in NLA, but Alex takes the cake with his singleminded genocidal intentions.
- Fredrik Pohl's Gateway had the lovingly dubbed Assassins, a xenophobic race which is bent on the destruction of every other sentient being in the universe. Once their equipment is activated by sufficiently advanced races (in this case, the humans), they send a signal to the Assassins to come clean up the mess. Thankfully, the player manages to avoid the destruction of the human race in both games with the help of the Heechee race.
- The Ur-Quan Masters:
- The titular Ur-Quan are divided into two factions: Kohr-Ah and Kzer-Za. The Kohr-Ah want to wipe out all other sentient life in the universe. The Kzer-Za will settle for enslaving or confining all other sentient life in the universe. Similar to the Ryall, it comes down to a species-wide Freudian Excuse - eons ago, they were all enslaved by a race of evil creatures with mind-control powers, and after finally casting off their shackles (in a thoroughly horrible way, at that - turns out, the evil aliens couldn't maintain control of a being in absolute agony), they decided that they couldn't risk it happening again. So they went to war with all other sentient life. The intervening generations have not mitigated their trauma - Genetic Memory means that it effectively happened to all of them.
- That said, the Kzer-Za are perfectly willing to find a new homeworld for races who have lost theirs (e.g. Syreen). It's a matter of Pragmatic Villainy for them - they can't afford to have a fleet of potential enemies flying around, and destroying an entire race is not an option for them. Their doctrine is also easier to accomplish than the Kohr-Ah's, because if you know you're going to die anyway you'll pull a Last Stand or Taking You with Me. Although the Shofixti did the latter anyway, so that doesn't always work. Also, both factions/subspecies are incredibly polite.
- The Kohr-Ah are also believers in reincarnation, and think they are doing everyone else a favor by giving them a chance to be reborn...as Kohr-Ah.
- Galactic Civilizations 2:
- In the first expansion, the Drengin undergo a similar (and reference-riffic) split: Their largest and most powerful clan, called the Korath clan, decided to exterminate all non-Drengin life, while the rest of the Drengin simply wanted to enslave the galaxy.
- The Dread Lords were the original Xenophobes (and the guys manipulating the Korath). Being biologically immortal, and capable of perceiving the whole of eternity, they don't see any point to intelligent life that doesn't live longer than a century or so. And if there's no point to that life's existence... why let them live at all?
- The Ascalonians of Guild Wars. Whose attitudes were that charr were strange and must be culled, and then that the other human nations were weird and must be culled. Anything or anyone that wasn't from Ascalon needed to die. They did love their cleansing.
- The Glomdoring Commune of Lusternia subscribe to this notion. It's their ultimate goal to seed the Glomdoring throughout the rest of the known world, while forcibly converting the other civilizations to their own viewpoint as they do. Resistance results in death.
- The Shivans of Freespace... may or may not fall under this. They do kill anything that isn't Shivan on sight, but they tend to ignore planets unless they are populated by a space-faring species they're exterminating at the time, and certain unexplained actions they take near the end of the second game have cast considerable doubt on their motives.
- Master of Orion: The Antarans, at least in the second game.
- "You may not surrender, you cannot win, your only option is death."
- Star Ruler's Galactic Armory mod adds the "Inhibitor" AI type. Inhibitors will go to war as soon as possible with any race they detect (after trying to extort them for resources, that is), and rely on weapons that distort space-time. Galactic Armory also beefs up the Remnants - who are long dead, but still have very much active AI controlled ships - rather than just sitting inside their long-dead systems, the Remnants will periodically send out ships to cull the lesser races - and they do a good job of it too, since they start out several orders of magnitude more advanced than the player(s) or computer-controlled empires.
- The old DOS game Terminal Velocity had as its Final Boss a planet-sized supercomputer called X.I., the Xenocidal Intelligence
- Sins of a Solar Empire's Rebellion expansion has part of the Trade Emergency Coalition break away into the radically xenophobic Rebel faction. While the Loyalist faction wants to ride out the war with superior defensive capabilities and economic and diplomatic might no matter the cost, the Rebels want to crush all xenos and "collaborators" in a wave of expansionist warfare. While the Loyalists get research to improve their diplomatic relations with other races, the Rebels have research to resist enemy culture and ally themselves with the Space Pirate armies and neutral militias. It is possible to form diplomatic relations as a Rebel, but they have heavy diplomatic penalties with basically every faction.
- In Meteos, Planet Meteo is driven by an instinctual compulsion to destroy all other sentience in the universe. It does this by spewing out the eponymous Meteos blocks, which seek out planets with life and crash into them until they're annihilated. This method backfires on Planet Meteo, however, when various intelligent civilizations independently discover how to repel the Meteos blocks and, just as importantly, that Planet Meteo is just as vulnerable to these blocks as any other planet.
- The goal of the human-supremacist Rebels in FTL: Faster Than Light is to destroy the various alien species and establish a new galactic society for humanity.
- In Stellaris, xenophobia is one of eight ethical directions an empire can take, with a normal and fanatical level of devotion to it, which can combine with other ethos and result in a variety of AI personalities. Pacifist xenophobes are strict isolationists that are rarely aggressive, but try to stay out of galactic affairs. Other xenophobes can be slaving despots that will only tolerate other species as forced laborers, or hegemonic imperialists out to subjugate the galaxy. "Fanatical Purifiers" are the ones that truly fit; they can't conduct peaceful diplomacy with other empires, and generally do their best to kill everything else in the galaxy. Fanatical Purifiers must be fanatic xenophobes and either militarists or spiritualist, but that leaves no room for an authoritarian bent. It's entirely possible for them to have a democratic government that just consistently votes for the mass extermination of lesser races.
- In Mass Effect: Andromeda we have the Roekarr which is an angaran terrorist organization that wants to kill all aliens in the Helius Cluster, both kett and milky way. It was founded by Akksul who after a year in a kett labor camp when from one of the angara's best and brightest to charismatic killer convincing hundreds of his kind to hate anything non-angaran, while they hate all aliens they usually end attacking the Initiative because unlike the kett they lack the numbers, resources and weaponry to properly defend themselves. They also kill angara willing to consider the Initiative as allies.
- In The Elder Scrolls series, the Sload, a race of "slugmen" native to Thras, an archipelago to the southwest of Tamriel, have a heavy isolationist policy and strong dislike of every other Tamriellic race. One exception they made was for a Maormer (Sea Elf) ambassador, who was allowed to visit Thras, be fed, and even meet a Sload elder. That ambassador described it all as "repulsive." The Sload attempted a Final Solution toward Tamriel using the Thrassian Plague, which wiped out over half of Tamriel's population in the 1st Era, believed to be even more than the Oblivion Crisis or Red Year. It's little wonder then that, despite their own various disagreements with each other, one thing most denizens of Tamriel can agree on is that the Sload are unrepentantly evil.
- The Xenos in Freelancer are a terrorist faction, conisting mainly of former miners from Liberty who became unemployed when Liberty's ecomony shifted away from blue collar and towards white collar work, and blame foreign influences over Liberty's government for their poverty. As a result they are hostile to almost every other faction in the game, with the only people they won't shoot on sight being the Zoners (who have a policy of absolute neutrality towards everyone else) and the Independent Miners Guild (who they respect for their independence from the major corporations).
- The Kvrk-Chk of Quentyn Quinn, Space Ranger have two categories of lifeform: "Other Kvrk-Chk" and "food". With these two categories forming a VERY disturbing Venn diagram... Part of this comes from their world being an EXTREMELY hostile environment, where most non-Kvrk-Chk species would die instantly just from atmospheric pressure or the toxic atmosphere, or the wide variety of scavengers and predators. Due to how hostile and aggressive their environment is, they have to eat their food alive just so the scavengers and decomposers of their world don't rot their food before it reaches their mouth. As part of their culture, a visiting Kvrk-Chk offers the master of the house one of it's own severed limbs as food. Oh, and they consider "Awake and Screaming" a flavor, and sentient lifeforms "chatty food". In a subversion, their treatment of "chatty food" and declaring war on every species out there didn't work very well for them when one of their new enemies incinerates one of their solar systems in retaliation. They listen to them now.
- Schlock Mercenary:
- The cultural dogma of the Ob'enn calls for "the eventual extermination of all non-Ob'enn". They do, however, recognize the usefulness of trading with other species and "borrowing" their expertise, where appropriate, until such time that they can get to exterminating.
- The dark-matter Pa'anuri. They have one name for baryonic-matter entities (which would include us, Earth, our Sun, and all observable (to us) matter in the universe), which is "ANNOYING". Using teraports (since they create gravitic tunnels in space; sort of like having a blind man drilling holes through your house) angers them, and if a species develops to the point of being able to teraport, they blow up that species'es sun. After drawing an extremely costly war against the Gatekeepers, the Pa'anuri moved shop to the Andromeda galaxy, where they began routinely destroying any civilization that invented the radio. The first baryonic space-farers from the Milky Way who went there found several radio shells... All of which are thirty years wide, and then scrambled by a supernova shell. By Earth standards, we would barely have invented the tank by the time our sun would have been blown up.
- The Vanguard: The ancient race the Malevol already wiped out all other life in their home galaxy of Andromeda simply because they didn't want to live with them, and expanded into our galaxy thousands of years ago looking to do the same. Fortunately we had our own elder race with the will and power to oppose them...
- The Global Guardians PBEM Universe features the Kalish'chahine, a horrifically warlike alien race who view all other forms of life as food resources. They breed so quickly that they exceeded their home planets' capacity to keep the population fed, and are capable of digesting any carbon-based life. To them, Earth is a smorgasbord waiting to happen.
- SCP-682 finds all Earthly forms of life disgusting and abhorrent. Thus, it tries to kill anything it comes across. The Foundation has been working on figuring out how to kill it first...without much success, since it has a powerful Healing Factor and promptly adapts to anything it's exposed to. Curiously, there's one thing 682 did not attack on sight: SCP-053, an apparently normal human child who any person who is around her for more than about a minute will attempt to murder. Much to the confusion of the Foundation, they got along famously.
- The Traash species in Adventures of the Galaxy Rangers, Big Creepy-Crawlies with the usual tropes that apply, were so xenophobic that "in Traash space, there exists no other lifeform but the Traash." When the Rangers' telepath was able to communicate with them, it was discovered that they hadn't even considered the idea that another species would try to make peace instead of attacking.
- The Brain Spawn in Futurama wish to wipe out all conscious thought from the universe because "the thoughts of others screech at them like the forced laughs of a thousand art house patrons." Later, their plan is to collect all knowledge in the universe and then destroy it to keep any new knowledge from appearing.
- In Season 1 of Ben 10: Alien Force, the Highbreed were this. Obsessed with genetic purity, they inbred themselves to the point of sterility, dooming themselves to extinction within a generation. They were the first sentient species to develop in the Universe (or so they claimed), and they were disgusted with the prospect of younger (and thus "inferior") species living on without them, so they planned to exterminate all lifeforms in the Universe.
- The Marcabians in episode "Secret of Easter Island" of the animated series of Blake and Mortimer are so racists that they consider all other species inferior and they kill them before they develop Faster Than Light technology and become a "menace to the Marcabian Empire". For the moment they reach Earth the already exterminate several sentient species.
- In Escape from Planet Earth Shanker's Evil Plan is to destroy every inhabited planet in the universe!
- Fanon of Invader Zim often depict the Irkens as this, based on the canonical facts that they wish to take over the galaxy and enslave and/or destroy all other species. In-series, however, only Zim himself seems to have this direct hatred of other species - the other Irkens seem to be merely acting out of a desire for power and a sense of superiority.