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Absolute Xenophobe
"Why kill the alien?" Rather, ask: "Why not?"
Battle-Brother Artemis, Warhammer 40K

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.

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.


Examples:

    open/close all folders 

    Comic Books 
  • Unicron, the evil overlord 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.
  • 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 Sodom 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.
  • In Superman's, 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. 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 enginering 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.

    Fanfic 
  • In 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.

    Literature 
  • 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.
    • MorningLightMountain hates fish.
  • 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.
  • The Krikkiters in Life, the Universe and Everything 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 flew out of the cloud.
    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.
  • 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.
  • 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.
  • The buggers appear to be this in Enderís Game, 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.

    Live Action TV 
  • In 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.
    • Rassilon himself is a horrifically successful Absolute Xenophobe himself. He studied and cannibalized Vampires to develop regeneration technology from their autopsies, and then tried to execute genocide on the race. He created a device that seeded life on the galaxy - life based on the Time Lords' own biodata, and killed everything that did not evolve from said technology. He imprisoned countless Divergents out of the universe so they could never, ever, rise to the challenge of rising against the Time Lords. His crowning act of monstrosity and xenophobia, however, was the Final Sanction, an Apocalypse How which would obliterate all of Creation so the Time Lords would Ascend to a Higher Plane of Existence, while leaving the remains vulnerable to the depredations of the abominations of the Last Great Time War.
  • The Cylons from Battlestar Galactica (Classic) 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.
  • Farscape:
    • 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. This is best summed up in this quote:
    "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!"
  • 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...
  • 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.
  • 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.

    Tabletop Games 
  • The K'kree in Traveller 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.
  • Several factions of Warhammer 40,000. Most notably, the Imperium of Man generally maintains an official policy of Absolute Xenophobia, but it's far from 100% honored, and there are valid reasons for it not being honored, such as that some aliens are harmless and destroying them would be a waste of resources, or that they're actually useful if kept at a "safe distance". Rogue Traders are also explicitly exempt from the usual restrictions on contact with Xenos, and are allowed to trade and interact with them as long as it is done in the interest of the Imperium. (But the average human being is taught to just fight/fear them). The Necrons, for their part, kill all lifeforms, not even limiting themselves to sentient ones.
    • The Necrons aren't so bad. Sometimes, they just use weird tortures and spread terror, or set themselves up as gods. The C'tan do have a sense of fun.
      • Well, the Void Dragon and the Deceiver anyway, the other two are crazy.
    • The Ciaphas Cain novels, specifically For the Emperor!, examine this in more detail. The Imperium and the Tau do not like each other, but are not continuously at war. Cain actually allies with a Tau squad when their interests align, but they split up as soon as it's convenient.
      • This is also due to him being practical. After all, wouldn't you prefer those plasma guns and rail rifles to be pointed at the genestealers, rather than you?
      • He also admits to being horrified at how far Tau sympathizers (Human and Kroot) are willing to go in assimilating an alien culture, eroding their own senses of self—because if they're that accomodating now, he doesn't want to think about how easily Chaos could get their hooks in. Absolute Xenophobia: Admittedly justified.
    • This has been heavily toned down as of 6th edition in order to justify the new allies rule. The Imperial isn't friends with the Eldar, or Tau but they rather not be enemies.
      • That was the case in older fluff as well. 5th edition rulebook for example mentions that the Imperium and Eldar fight together about as much as they fight against each other.
    • Humanity is hardly alone in being extreme xenophobes in the 40k universe. Eldar of craftworld Biel-Tan seek to rebuild the Eldar empire by wiping out any "lesser races" that dare to colonise Eldar worlds (which they define as any planet the Eldar ever colonised or intended to colonise in the last several hundred millenia), Orks want to fight and kill everything un-orky (though to be fair, they spend just as much time, if not more, fighting each other), Dark Eldar see all other life as prey animals, many Necron dynasties want to wipe out all life (the rest just want to conquer the galaxy)... Really, the Tau are just about the only major faction that is ok with the idea of sharing the galaxy with other sapients, and even they have a "join our empire or we'll annihilate you" policy.
  • 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.

    Video Games 
  • 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.
  • In 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. Also, both factions/subspecies are incredibly polite.
  • In the first Galactic Civilizations 2 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 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.
  • The Zuul from Sword of the Stars believe in a divine purpose for their race, which is to enslave and kill off every other species but their own and their "master's". Word of God says this is partially due to culture and partially built-in instinct; the Zuul were bred by a race of Abusive Precursors as a living bio-weapon to exterminate other civilizations. In-game, making NAPs and alliances with Zuul is all but impossible: Their default state towards everyone is war.
    • Slightly subverted in the sequel, where a faction of the Zuul breaks away and allies itself with the Liir. This is partly due to the Liir using their own Psychic Powers to imprint their views into their minds.
  • Falmer from The Elder Scrolls series are a fantasy variant; being betrayed and enslaved by their cousins the dwarves instilled into them a hatred of all civilized races, and rebelling against their masters caused them to develop a fondness for war.
  • 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.

    Webcomics 
  • The cultural dogma of the Ob'enn from Schlock Mercenary 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 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".
  • 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...

    Web Original 

    Western Animation 
  • 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.
  • 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.
  • 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.
  • In most incarnations of Transformers, Decepticons hate anyone who isn't a Decepticon, or anything that is organic in nature.
  • 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.
  • In Escape From Planet Earth Shanker's Evil Plan is to destroy every inhabited planet in the universe!

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