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Genocide Backfire

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"You can't get them all, here today. Doctor, you say you can hunt the rest down. I doubt it. They're too smart. They'll find ways to evade us we haven't even thought of. You won't kill them all. But they'll remember you tried."
Joshua Valiente, The Long Mars

A villain annihilates an entire people and their culture to achieve some goal, but only has incomplete success and the resulting incompleteness comes back to bite them in the ass in the form of the one guy or small group of individuals who survived the massacre.


It often involves a prophecy, and this is the villains' attempt to "Screw Destiny." For all the good it does them.

This typically means murdering hundreds of people to kill a single child, who will inevitably escape — see Nice Job Breaking It, Herod! Sometimes, the evil overlord might live out his life successfully, but his descendants pay the price.

Expect the survivor to benefit from Uniqueness Value, using his heritage and tragedy to fuel the coming Roaring Rampage of Revenge (or the even more tragic Cycle of Revenge). Sister Trope to Nice Job Breaking It, Herod!, with which it can overlap when the motivation behind the Genocide is finding and killing particular individuals.

It is sometimes called the "Dandelion of Doom" or "Dandelion effect," per the expression: "If you kick a dandelion, you spread its seeds." Just as this is an ineffective way to remove weeds from a lawn, it is an ineffective measure to remove potential threats to one's rule.


Sister Trope to Nice Job Breaking It, Herod!, with which it can overlap. The primary difference is that this trope only requires the villain to wipe out a group of people to achieve some goal, with the survivors subsequently trying to get revenge on him. The Herod approach requires foreknowledge on the villain's part (through prophecy, time travel or the like) that someone will one day oppose them and they try to circumvent it by killing the hero before he can grow up.

A type of Villain Ball, and subtrope of Laser-Guided Karma.



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    Anime and Manga 
  • In Dragon Ball Z, this trope applies to Frieza:
    • Frieza exterminated the Saiyan race in an attempt to prevent any from potentially becoming the legendary Super Saiyan. He missed four (excluding the ones from the movies, which put it at eight or so). Two of them, Raditz and Nappa, worked for Frieza alongside Vegeta, the prince of the Saiyans, but Goku, the fourth, would eventually take Frieza down by becoming the very thing Frieza feared. What's more, after getting turned into a cyborg and coming to Earth to take revenge, both he and his father King Cold are taken down for good by Future Trunks, who turns out to be the son of Vegeta, the other major Saiyan to survive.
      • Vegeta even lampshades this shortly before Frieza transforms into his second form.
      Vegeta: So, you tried to eliminate the Saiyans, yet you left the strongest one alive! Smooth move!
      • For bonus points, Dragon Ball Minus reveals that if Frieza hadn't ordered all the Saiyans back to their home planet to destroy them all at once, Goku wouldn't have even been sent to Earth for his protection by his suspicious parents.
    • Frieza's cavalier extermination of the Namekians almost became this when he discovered that simply having all seven Namekian Dragon Balls wasn't enough to grant his wish. Realising that the Namekians knew something about their use that he didn't, he made a quick but frantic search for any survivors.
  • In Hunter × Hunter, this seems to be creeping up on the Phantom Troupe, who murdered the entire Kurta clan, maimed their corpses by removing their pretty eyes to sell them, and treat it as no big deal, which further angers the last surviving Kurta, Kurapika. Kurapika has already killed two of their members, and is quite intent on finishing what he started.
    • On top of that, if it weren't for some timely intervention from their leader, Kurapika would've killed 6 — half of the entire group by the time he killed the second. That's how big of an enemy they've made.
  • Deliberately invoked in Naruto by Itachi with the Uchiha Massacre. He leaves Sasuke alive because he wants to die by his hand. It falls through, though; by this time, Sasuke has abandoned the Leaf Village, and afterward, he decides to actively destroy it.
  • The Ishvalan Genocide from Fullmetal Alchemist is an interesting case. The purpose of the extermination was not to prevent a prophecy from being fulfilled or to dispose of a threatening ethnic group per se, but to simply kill as many people as possible (Ishval was chosen simply for its location) - their aim was to kill every Ishvalan, but as you would expect, there were some survivors. Now, one of those survivors was Scar, whose brother was killed in the extermination and who was determined to avenge his death to the State Alchemists... that is, in the beginning. Later, he does a Heel–Face Turn and starts helping the Elric brothers. In the end, he plays a crucial role in causing the Big Bad's Evil Plan to fail and kills Bradley, the man who ordered the genocide - which he would not have done, if the genocide had not existed in the first place.
    • In the 2003 anime version, the purpose was to make the Ishvalans desperate enough to attempt to create a Philosopher's Stone — something Scar ends up doing by using an entire army unit of Amestris as the resources for one. Meanwhile, Bradley is killed by one of the soldiers who was a part of the Genocide and was instilled with an immense hatred of the current system by the atrocities committed there — Roy Mustang.
  • Yu-Gi-Oh!:
    • In the Millennium World Arc, it turns out that the Millennium Items were a result of an alchemical ritual that involved sacrificing 99 human lives. Deeming it a necessary evil to restore peace to the land, the Pharaoh's brother neglected to inform him of that and harvested the lives of the denizens of Kul Elna, the wickedest people in the country. Only one child survived, bearing witness to the massacre, and he grew up to be Thief King Bakura, The Dragon to Big Bad Zorc.
    • In the Yu-Gi-Oh! GX manga, it turns out that there was another survivor who wasn't in the village at the time, and his hatred and malice when he learned what happened gave birth to a very powerful, very evil spirit. That spirit was thwarted by the Pharaoh's priests, who stripped it of its physical form and sealed it away. Some time after the original series, he was released by explorers and became the Big Bad of this series.
  • In Attack on Titan, Eren attempts to end the Cycle of Revenge plaguing his people, thereby letting his friends live in peace, by exterminating 80% of the human race in a Thanatos Gambit. While the genocide part of his plan went off without a hitch, and his friends ''do'' get to live out their lives in comfort and peace , the rest failed miserably as the series ends as Eldia in the distant future is bombed to dust by the survivors and a lone child entering the World Tree to restart the cycle.
  • Bleach: Soul Reapers cleanse Hollow souls back into the reincarnation cycle while Quincies destroy the soul completely, damaging the Balance of Souls between worlds. To save existence itself, the Soul Reapers wiped out the Quincies but didn't know until too late that most Quincies were in hiding, building their power to retaliate. Only a very few on both sides suspect the two sides are equally to blame.
  • In Demon Lord Dante, God wipes out the original human race in order to replace them with himself, but some of those exposed to his power absorb it and mutate into the first demons.
  • In One Piece, the World Government was worried that the scholars of Ohara would discover the Void Century, a point in time they didn't want anyone to know about. Therefore, they exterminated the entire island. The lone survivor, Nico Robin, vowed revenge by discovering the Void Century.
  • Played with in Saiyuki, which inverts the usual perspective of the trope. Hakkai kills off an entire youkai clan in a fit of madness caused by them kidnapping his sister/lover Kanan, only to have an apparent survivor of the massacre, Chin Yisou (who is, for bonus points, the child of the clan's head), turn up three years later with clear intents of getting revenge. By that time Hakkai fails to recognize him, complaining bitterly that he thought he murdered them all. Then subverted when Hakkai finally remembers the incident, realizing that he did actually kill Chin Yisou back then; the youkai "survived" by turning his own body into a shikigami seconds before death, just so he could get revenge on Hakkai. Naturally, Chin Yisou doesn't survive the second time.
  • Mobile Suit Zeta Gundam: The Titans gas colony after colony hoping to crush Spacenoid dissent, but all it does is outrage those not just in space, but all across the Earth sphere to rise up against them. Most villains stop when they're stupid enough to Create Your Own Hero, but the Titans go one further and Create Their Own La Résistance.
  • An interesting take in She Retaliated Because Her Entire Family Was Wrongfully Executed. The villains succeed in carrying out horrific genocide in chapter 1, as punishment for false charges of treason upon the Sabluveir fief and its entire population. This turns out to be a fundamentally horrid idea, as the moment that the last survivor, Emilia, is killed, the entire population rises again as undead, fueled by the hatred spurred by the horrific and sadistic manner in which they were killed and their deaths were celebrated. The rest of the story involves the Sabluveir fief putting their enemies through the same experience exactly, and then swelling their ranks by assimilating the corpses into The Horde in a Zombie Apocalypse!
  • Patry along with the other elves from Black Clover were massacred by royals at Licht's wedding. He was the only one reincarnated into a human body, and to avenge his murdered tribe he formed the Eye of the Midnight Sun and resurrected the Third Eye to kill all the humans in the Clover Kingdom five centuries later. He goes on to defeat Julius and reincarnate the other elves using the magic stones to try to kill all the humans. However, it's later revealed the devil Zagred chose him to be his Unwitting Pawn as the only elf reincarnated, and intended him to try to avenge the elves when it was Zagred who had lied to the royals and persuaded them to kill the elves.
  • In That Time I Got Reincarnated as a Slime, the Majin Gelmund approached the Ogre prince with the offer of a name and evolution to his next form, but the prince refused. In return, Gelmund had the Orc Lord Geld send his orcs to destroy and devour the ogres, with only six survivors including the prince. Of course, even if the prince had accepted, Gelmund would have still sent Geld to destroy them since the Orc Lord gets stronger with every victim he or his army devours and the strengthened/evolved prince would simply be more empowering for the plan to make Geld a new Demon Lord. The six ogres would later run into Rimuru Tempest, who agreed to help them with their vengeance and gave them names that evolved them in Kijin. The Kijins were instrumental in decimating the orc forces, which set the stage that lead Gelmund to be devoured by the Orc Lord Geld to initiate his transformation into Demon Lord.

    Comic Books 
  • In one Lanfeust spinoff, an alien shapeshifter race is genocided due to their aggressive attacks on many planets. Only one individual survives, but eventually hatches a plot to control the Galaxy and causes much destruction.
  • In the comic version of Wanted, the Big Bad Mister Rictus deliberately invokes this trope, though on a much smaller scale. After murdering an entire family, he leaves a single child alive, banking on the chance that he will grow up to try and take revenge on him. Yes, Mister Rictus really is that bored and crazy.
  • Sonic the Hedgehog (Archie Comics) had this for its Endgame storyline: Dr. Robotnik uses the Ultimate Annihilator to erase Knothole from existence in front of Sonic. A combination of Snively's backstabbing, a mini nuke and Sonic's own two fists ensures that Knothole is restored and Robotnik's done away with permanently.
  • An interesting variant in one The Sandman story, it's implied that Despair organises the destruction of Krypton by persuading the Anthropomorphic Personification of Rao, the Kryptonian sun, to seed life on the unstable planet. However, Despair also intends for there to be a single Kryptonian left alive, assuming that he will spend his entire life mourning his lost world in despair. That Kryptonian grew up to be Earth's greatest hero, and a symbol of hope to billions of people, so Nice Job Fixing It, Villain.
  • Paperinik New Adventures: The Evronians are feared across the galaxy for their destruction and enslavement of many different species. This backfired on them when they destroyed the planet Xerba, where a scientist had performed experiments on herself so she could acquire the power of a star. So to their terror the Evronians were suddenly confronted with a virtually unstoppable superbeing gunning after them to avenge her people.
  • In The Children's Crusade, the Scarlet Witch returns but does not find a welcome committee. In fact, the X-Men want to execute her for the genocide of the mutant race, and the Avengers to kill her for the threat she is to reality.
  • Superman:
    • Several centuries prior to the beginning of The Third Kryptonian, Amalak's home world was devastated by a Kryptonian army squad while Amalak was off world. When Amalak returned and discovered his people had been wiped out, he swore vengeance on all Kryptonians.
    • Man of Steel (2018) retcons the destruction of Krypton into being caused by an alien named Rogol Zaar. Driven by hatred towards Kryptonians, Rogol asked the Circle -a clandestine interplanetary peacekeeping council- for help to destroy Krypton. His request was rejected by every member minus Empress Gandelo, who also feared Kryptonians, and secretly provided Rogol with the means to destroy the planet. However, two Kryptonians survived, and in The Killers of Krypton, they expose the crimes of the Circle and get both Rogol Zaar and his backer captured and punished after a tough beatdown.
      Superman: Kara, we can't just toss everything we don't like into the Phantom Zone.
      Supergirl: Not everything. But him? This monster? He says— he confessed to blowing up Krypton. Well that, according to Kryptonian laws, would sentence him to life in the Phantom Zone. Oh yeah, and he destroyed Kandor with his bare hands!! So on behalf of all Kryptonians... $@#$# him.
    • Legends of the Dead Earth: In Superman: The Man of Steel Annual #5, the Empire wipes out the people of Hydros as part of the Krypton Protocol, an initiative of Luthor the 60th to systemically destroy any planet whose natives are likely to develop superpowers under the sun of another world. Hydros is the 36th planet to be so destroyed. However, Kaleb survives the extermination of his people, having been rescued by the rebellion, and is trained by them to become the new Superman. By making use of his extensive powers, the rebellion is able to score substantial victories against the Empire.

    Fan Works 
  • Abraxas (Hrodvitnon): In this MonsterVerse fanfiction, Ghidorah is revealed to be responsible for exterminating the rest of Thor's species in ancient times, and it's likewise heavily implied that Ghidorah caused or at least contributed to Godzilla becoming the Last of His Kind too. Thor holds a desire for revenge on Ghidorah, and Godzilla's relationship with Ghidorah needs no explanation.
  • In The Butcher Bird: The World Government's attempt to genocide ghouls shortly after their accidental creation (which is arguably reasonable given that they're superhuman killing machines who view humans as prey) results in the few survivors going underground and repopulating their race on the fringes of society while harboring a very large grudge against said World Government. This is not helped by how the World Government's policy of wiping out information has caused almost everyone by the time of the story to have forgotten that ghouls exist...
  • Still Stand in the Sun doesn't have a true Genocide Backfire in the sense that the canon story did in Avatar: The Last Airbender, but presuming that Hama's story still played out the same way it did decades earlier, there are now two able and willing bloodbenders loose in the Fire Nation, as Katara learned bloodbending by herself out of desperation in order to escape from the Waterbender Prison.
  • An exceedingly dark example occurs in Mass Effect: Synthesis. Midway through the story, the Citadel Council attempts genocide against humanity with a biological strike when they learn that they allied with the Reapers and destroyed the Batarians, not realizing that the humans were just acting in self-defense when the Batarians attempted to enslave them. The Council's attack didn't immediately wipe mankind out, but the loss of life was so hugely horrific that, in retaliation, the humans and the Reapers launch their own brutal campaign of genocide against the asari and salarians. Four years later, both species are extinct.
  • A Tale of Two Rulers: In his past lives, Ganondorf's various wars against the Gerudo were in part vengeance for the genocide committed against the Gerudo (which was caused after Ganondorf originally attacked Hyrule).
  • This Bites!: The World Government knew there was a D. bloodline hiding in Flevance but didn't know who it was. So as soon as they had an excuse, they did everything they could to wipe out the entire country. Not only did one of the people that they were trying to kill survive, but the incident also left him bearing quite the chip on his shoulder and a massive grudge against the World Government that he only let go of because of the rogue actions of one of their Marines. When he learned the real reason for the loss of his home and family, however, that grudge returned tenfold.

    Films — Animated 
  • Occurs in Kung Fu Panda 2, overlapping with Nice Job Breaking It, Herod!; Lord Shen is told a prophecy that he will be defeated by a "warrior of black and white", and decides that the correct way to respond to this is to commit panda genocide. Of course, Shen is later defeated by Po and his village is avenged. The trope is subverted when Shen first meets Po, and is a little surprised to find that said panda has no idea what he'd done due to him being a baby when it happened. Further played with at the very end where the audience learns that the survivors re-settled elsewhere, so it didn't just backfire — it straight-up failed. Nonetheless, Shen's actions were what facilitated his defeat, as it would eventually cause the baby Po to end up in the Valley of Peace, which would allow him to get the training he would need to defeat Shen.
  • In Titan A.E., the Drej destroy the Earth, reducing humanity to a few thousand scattered survivors because they believed us a threat. In the end the Drej are used to power the Titan and create a new homeworld for the human race.

    Films — Live-Action 
  • In The Chronicles of Riddick, the Lord Marshall of the Necromongers tries to wipe out the Furyan race, due to a prophecy that a Furyan would kill him. He misses (at least) two of them; the titular Riddick is one of them. Funny thing is, Riddick doesn't give a shit about any prophecy and only wants revenge for himself and a few others he might call friends.
  • The Dark Crystal:
    • There's a prophecy that a Gelfling will undo the damage to the Dark Crystal, ending the reign of the Skeksis, so of course they go off on a Gelfling killing spree. One of the Skeksis himself, (pretending to be friendly) says "Prophecy! Prophecy caused all this trouble!"
    • In a double invoking of the trope, the male Gelfling Jen is saved by one of the old Mystics and raised among them; on his deathbed, the eldest Mystic sets Jen on his course to defeating the Skeksis. Meanwhile, the female Gelfling Kira is hidden by her mother just before the Garthim take her, and is found and raised by the Podlings. The Skeksis-serving Garthim still raid the Podling villages, to boot.
  • In The Scorpion King, the titular protagonist was one of the few survivors of Memnon's genocide of the Akkadian people. Shortly after the beginning of the film, he ends up being the sole remaining member of his people. Turns out, he is the one who was prophesized to take Memnon down.
  • Star Wars, of course. They didn't kill Anakin and Padmé's children. Nor did they kill Obi-Wan. Or Yoda. They didn't even kill Leia when they killed all the other Alderaanians. This did not work out well for Palpatine.
    Leia: The more you tighten your grip, Tarkin, the more star systems will slip through your fingers.
    • The Expanded Universe shows that the Alderaan Survivors (those off world when the Death Star came by) almost universally enlisted in the Rebellion after that point. Many other systems began to more openly rebel after the fate of Alderaan came to light. Considering the Emperor wanted to use it to enforce policy on rebellious worlds, the ship was an abysmal failure.
    • Star Wars Legends canon plays a horrifying game of ping pong with this. A never-ending, cyclic religious war between the Sith and the Jedi (with their Empire and Republic as proxies) has been going on for 7,000 years with one side hunting the other down to a handful of survivors, who regroup, fight like cornered rats, and do the same to their enemies, who go into hiding, rebuild, and attack again...while the Force seems quite indifferent to (or maybe even encourages) the cycle of revenge and bloodshed.
  • In TRON: Legacy, Clu kills off all the ISOs, emergent programs that Kevin sees as a miracle but Clu sees as "imperfect". By the end of the movie, Clu wants to exit the Grid in the worst way, but he gets re-merged with Kevin while Quorra, the last ISO, rescued by Kevin, escapes the grid to the real world with Kevin's son Sam. Not quite a genocide backfire since Quorra didn't land the fatal blow, but Quorra got to leave the Grid while Clu did not.
  • The Godfather Part II The local ganglord kills Vito Andolini's father, then his brother when the brother tries to get revenge, then his mother when she tries to protect Vito ('because he's slow'). Vito then has to leave Sicily for America, where he becomes Vito Corleone. He then returns to Sicily to off the ganglord.
  • Skynet in the Terminator series wipes out most of humanity, but the survivors come together to fight back. However this becomes a Zigzagged Trope in Terminator Genisys, where from Skynet's perspective, the humans are the ones trying to wipe it out before it's born, leading to Skynet's desire to destroy humanity.
  • Parodied in Kung Pow! Enter the Fist when Master Pain kills The Chosen One's entire family before attempting to kill him. However, even as an infant The Chosen One is too strong to take on in a straight fight so Master Pain just burns the house down. The Chosen One, of course, survives and grows into adulthood and eventually defeats Master Pa-, Betty.

  • The Humans in An Outcast in Another World, facing extinction at the hands of the other races, give a final fuck-you to the world by sacrificing themselves to unleash The Cataclysm, which ravages the lands and almost ends civilization.
  • Harry Potter: Lord Voldemort's reason for targeting the Potter family was because of a(n incomplete) prophecy stating that he would mark a child as his equal and decided to try and avert it by killing said child. When Lily Potter died for her son, that sacrifice enabled Harry to survive the Killing Curse and rebound it back to Voldemort, with the only injury baby Harry received being his famous lightning bolt scar, and thus, Voldemort ended up fulling the first part of the prophecy.
  • Ublaz Mad Eyes of the Redwall series sent a group of corsair minions to destroy Holt Lutra (a community of otters) in order to procure a special set of pearls that he wanted for his crown. Unfortunately for him (and a lot of other people), Grath Longfletch, the leader of the group's daughter, just barely survived, and when she recuperated, dedicated her life to killing every corsair she could find. She is ultimately a key member of the group from Redwall that travels to his island and defeats him. Although she doesn't actually know who he is, and is not personally responsible for his death — Martin has that honor.
  • In The Graveyard Book this is the reason why the Jacks of All Trades killed Bod's family.
  • Dune: the Baron Harkonnen kills his rival, Duke Atreides, and attempts to do the same with his only son, thus wiping out the Atreides family line and ending the millennia old Atreides/Harkonnen blood feud. At first he thinks he's successful, but they never find the boy's body...
  • In R.A. Salvatore's Forgotten Realms novel Homeland, one Dark Elf house in Menzoberranzan is punished for failing to kill off all of a rival house's noble family by the Decadent Court, which sentences the attacking house to be exterminated properly. This is built into their "law"; total extermination is fine, just don't leave any witnesses. Of course, only surviving nobles count as witnesses, not ordinary underlings. Wouldn't want to actually discourage competition, now. And it would be a waste of people to kill everyone.
    • Ironically, even this fails. One of the recruitable characters in the Baldur's Gate series is one of the few surviving members of this family.
      • Then again, she is a non-Lloth priest, so she may have left Menzoberranzan before.
  • In the novel Talon of the Silver Hawk, the eponymous character is almost the Last of His Kind, and ends up working (under the name Talwin Hawkins) for the guy who ordered it in a long-term plot to bring him down.
  • Played with in Jack Vance's The Demon Princes. The hero wouldn't have had any reason to devote his life to tracking down and killing the titular villains if they had chosen a different space colony to raid on that day.
    • Also different in that it was the other survivor, his grandfather, who groomed him to be an instrument of justice. The hero may have just gone off to life peacefully somewhere else if given the chance early on.
  • In the first book of Laurie J. Marks' Elemental Logic series, a whole tribe is killed off because of a prophecy that indicates Bad Things for the invading army if a single member of the tribe survives. Of course, one (and only one) tribe member escapes...
  • In C.S. Friedman's Coldfire Trilogy, the immortal and extremely narcissistic Magnificent Bastard character of the series left one of his children alive when he slaughtered his family to make a pact with a demon. His descendants were free to live without being troubled, provided they never laid claim to his title as the Neocount of Merentha. If any of the male descendants did so, then The Hunter would again lay waste to his entire family, save one. He was vain enough that he always left the one descendant who looked the most like him alive. Of course, this bit him in the ass when the survivor of the last generation played a key role in the Patriarch's scheme to destroy him.
  • In Jacqueline Carey's The Sundering, the Anti-Villain Satoris wipes out a desert tribe that sent a child to destroy him. Unusual in that the child had already been dispatched by that point; however, he had nothing in particular against Satoris until his village was destroyed, and it's strongly implied that he could have been talked out of his quest if that atrocity hadn't been committed.
  • It's implied that Garoth Ursuul of The Night Angel Trilogy commits genocide often enough that he actually has a list of rules, among them is "You will always miss one." This is never shown to actually come back to haunt any Ursuuls in the book, however.
  • Happens lots of times in David Weber's Empire from the Ashes, as the omnicidal Achuultani, themselves a last remnant from a campaign of genocide by a hostile power in their own galaxy, have nearly wiped out humanity several times. We now have planetoid dreadnoughts whose star drives can cause supernovae when used too close to a star, and each has combat capability equivalent to hundreds of thousands of Achuultani ships. Oh yes, and we know where they live.
    • On the positive side of things for the Achuultani, due to certain plot developments and revelations, it is quite likely the eventual human counter-attack will include willing Achuultani participants seeking to free their fellows from the AI that has effectively enslaved them via the cycle of near-genocides and a liberal definition of crisis.
  • Implied at the end of Out of the Dark, again by David Weber. The Shongairi announced themselves to Earth with a series of Colony Drops on Earth capitals, and when controlling Earth proved to be impossible tried to exterminate mankind with a biological weapon. They failed, and at the end Humans knows how to replicate Shongairi technology and where they live.
  • A small-scale version of this is the core plot of Mercedes Lackey's first Vows & Honor short story Sword-Sworn. A large force of bandits, with the aid of a wizard to strike down the sentries, ambushed the Shin'a'in clan Tale'sedrin on the way back from a horse fair and killed every one of them... save the skinny teenager they did not bother making sure of after strangling and gang-raping her.
  • Last Legionary: The Big Bad deciding the Legions of Moros were the major obstacle to him conquering the galaxy and that eliminating was the best course of action? Doesn't work out so well. The Legions weren't even aware of the Warlord's existence prior to the attack that left Keill the only survivor of his race.
  • The Belgariad: the line of Riva was supposedly killed off by Queen Salmissra. One prince survived, and his descendants were hidden by Polgara and Belgarath.
  • The Lord of the Rings: Sauron believed that he had killed off the line of Isildur. He forgot about Aragorn.
  • In The Once and Future King, Arthur was convinced by his advisers that as the bastard of a King and a child of incest, the baby Mordred had to die. Unable to locate the target, Arthur had every child of the correct age in the area placed on a ship that was then sunk with the all aboard, turning Mordred permanently (and not unreasonably) against him.
  • RCN: Referenced. In the Backstory, Daniel Leary's father, former Cinnabar head of state Corder Leary, ordered the beheading of Daniel's now-friend Adele Mundy's entire family on charges of treason.note  Adele, who survived due to having left for an offworld university a couple days earlier (the Cinnabar Senate later dropped all charges against survivors), comments once in her Internal Monologue that if she's ever in the same room as former Speaker Leary, she won't bother with the formality of a duel. Fortunately for all involved, Daniel and Corder Leary are on such poor terms he's only appeared in one scene, for which Adele wasn't present.
  • 1632; thanks to the presence of 20th century history books, Charles I of England gets it into his head he can prevent his overthrow and execution in the English Civil War by rounding up and imprisoning/executing the men who would do it. In the process, he ends up killing Oliver Cromwell's wife and son, and Cromwell (who at the time had not even entertained the thought of rebelling) decides to get things started earlier once he escapes.

    Live-Action TV 
  • In the finale of season 2 of The 100, the inhabitants of Mount Weather attempt to harvest citizens of Arcadia for their bone marrow, as bone marrow transplants from the Arcadians, who have adapted to living on the irradiated surface of Earth, will allow the people of Mount Weather to survive there too. To stop this from happening, two Arcadians vent surface air into the Mount Weather compound, irradiating it and exterminating its entire population save one.
  • A very longterm example occurs in the Babylon 5 universe. The Hyach once shared their planet with another sentient species, the Hyach-do. The two races coexisted peacefully for thousands of years, and even intermarried, until the Hyach exterminated the Hyach-do in a frenzy of religious fervor. Centuries later, it was discovered that the declining birth rate of the Hyach is because interbreeding with the Hyach-do was necessary to sustain the Hyach genome. Thus, in wiping out the Hyach-do, the Hyach have doomed themselves to extinction as well.
  • In Barbarians Rising, Viriathus is a mere shepherd who escapes a Roman punitive slaughter of Lusitanian tribesmen and morphs into a reluctant Rebel Leader.
  • Played with in Chikyuu Sentai Fiveman where the Big Bad was defeated by the flower of the first planet he wiped out (he forgot the memo to destroy it completely).
  • Doctor Who
    • A rare heroic example: The Doctor has attempted genocide on the Daleks at least four times. It never takes. They just hate him even more now than they did before.
    • He did deliberately avoid committing genocide in Genesis of the Daleks, giving as his reason that while the Daleks are indeed evil, omnicidal Space Nazis, a lot of good has come out of people banding together to fight them. That decision sure came back to bite him in the ass.
    • After the Doctor supposedly wiped out the Daleks and Time Lords when the Time Lords were prepared to destroy time itself, one more Time Lord managed to escape the War some time before. Not only is he his (other) arch-enemy, but the rest of the Time Lords use him to escape.
    • The Doctor ended the Time War through the use of some unspecified superweapon, which was supposed to kill all the Daleks and accidentally killed all the Time Lords, but Daleks keep popping up. It becomes clear in the Tenth Doctor's last episode, however, that this is because he wasn't just aiming at the Daleks.
      • In the 50th anniversary special, it's revealed that rather than destroy the Daleks and the Time Lords the superweapon in question convinced the Doctor, with help from two of his next incarnations, to hide Gallifrey in a pocket dimension. Ultimately, it would have been the Daleks aiming at themselves.
  • Game of Thrones:
    • House Bolton tried to wipe out the Stark bloodline. The Stark remnants fighting back and Ramsay's own Stupid Evil tendencies led to the Bolton bloodline's extinction instead.
    • Arya takes a particular delight in pointing this out as all the males of House Frey die from poisoned wine, annihilating it as a house, as Arya poses as Old Walder Frey via Skinchanging, saying they should have wiped out all of the Starks, root and stem, but since they didn't, they are where they are now.
      Leave one wolf alive, and the sheep are never safe
  • Tried by Darken Rahl in Legend of the Seeker. He got wind of a prophecy that the True Seeker would be born in a certain town, so he had his troops, led by his most trusted lieutenant, to kill all the first born sons in the town. Sure enough, Richard was spirited away, and when Rahl finds out 20 years later, he executes the lieutenant.
  • In Lexx His Divine Shadow was very thorough in wiping out the Brunnen-G in order to thwart a prediction that the last of their race would destroy him, but he made the mistake of mocking the prophecy by turning the last Brunnen-G Kai's corpse into an undead immortal killing machine under his control. The Divine Shadow himself is the parasitic essence of the last Insect that the Brunnen-G missed when they defeated the Insect Civilization.
  • Uther Pendragon in Merlin attempted to kill all the magic users and dragons he could find. Now that he's cleared out all the harmless, innocent ones, the more violent and powerful ones are gunning for his blood. He did manage to kill all the dragons, but decided to keep the last one as an example. When it gets loose, it very nearly burns his city to the ground. And just when you think he's too much of a Karma Houdini his daughter Morgana turns out to be magical and kills him.
  • The Outer Limits (1995): In "To Tell the Truth", after the first wave of colonists arrived on Janus Five, they attempted to place the small and primitive native population into reservations, but the natives proved to be uncooperative. A squad of colonial marines was sent in to kill them, and they later reported that their mission had been accomplished. In spite of this, stories persisted that some of the natives had survived and that they were shapeshifters. It turned out that these stories were true, and that one of the natives had taken the form of the colony's security chief Montgomery Bennett. Moments before the sun flashed over as Dr. Larry Chambers predicted, Bennett tells the council chairman Franklin Murdock that Chambers' theory that the indigenous lifeforms had evolved to survive the aftereffects of the periodic devastation was correct. He adds that Murdock had been right himself in another respect: the natives planned to use the opportunity to retake control of Janus Five, and the humans' leftover ships and weapons would allow them to repel any further attempts to colonize the planet. The native in Bennett's form is killed, but he is praised by his people for making a Heroic Sacrifice so that they could reclaim their home.
  • Stargate-verse:
    • In Stargate SG-1 where Daniel lands in an alternate grimmer dimension where the Goa'uld have invaded Earth, a cold-hearted O'Neill sends a nuke to the Jaffa homeworld upon learning the location from Daniel. This bites him in the ass when he pleads to Teal'c to think of his son, who had been killed by the nuclear strike.
    • In Stargate: Continuum, Baal is smart enough to know that trying to exterminate the Tau'ri will only cause eternal resentment among the survivors who will try and take revenge. Instead, he tries to woo humanity to his side peacefully with the intention of turning them into the next generation of Jaffa. Unfortunately for him, his wife didn't quite see it that way, and decided to do a bombardment of the planet after murdering him.
  • Near the series finale of Star Trek: Deep Space Nine, the Cardassians have at that point lost all standing with the Dominion and are not much more than unwilling vassals. This leads elements of the the civilian population to subvert the Dominion war effort through acts of sabotage. As a result of one particular incident which nearly cost them a battle, the Female Changeling orders a major Cardassian city to be wiped out by orbital bombardment as an example, and announces that the Dominion will destroy one city for every act of sabotage committed. After hearing this, however, the entire Cardassian fleet does an abrupt Heel–Face Turn mid-battle in favor of The Federation instead, as well as getting many Cardassian soldiers on-planet to defect. This in turn prompts the Dominion to to start slaughtering the Cardassians en masse, but since her subordinate proceeds to send out most of their troops stationed at the base to do so, this leaves their installation critically under-guarded when Damar and his crew attack Dominion Headquarters screaming the name of the exterminated city as a battlecry. About half of the force that storms it had been guarding it up to that point.
  • Star Trek: Voyager had a variant: The Krenim were going around exterminating entire races from the timestream to make it so their empire never fell. Unfortunately, this was a hit or miss endeavour. Sometimes, it resulted in their empire being at near full strength, others it set them back centuries. But the first real backfire that happened was that one of the races that helped destroy their empire in the first place also introduced some disease treatment whose absence caused the death of the project lead's wife, and none of the altered timestreams had a cure. Since then, the project lead was desperately searching for a way to fix things for his own selfish reasons. Ultimately, the problem is solved when Voyager rams the superweapon when it's about to fire, causing it to Ret-Gone itself.
  • Star Trek: Enterprise: What's waiting for the Xindi if they succeed in wiping out humanity, which they do in one Bad Future. They've been told by a "benefactor" from the future that humans will destroy their world, when the truth is humans will save them and the rest of the galaxy from destruction, as the linchpin of the Federation.
  • Supernatural: "Everybody Hates Hitler" opens with a Golem made by a secret society of Jewish sorcerers assaulting a concentration camp and utterly massacring the Nazis staffing it.

    Mythology and Folklore 
  • King Arthur:
    • King Arthur learned that he would be destroyed by a child born in a certain month, he had all the babies from that month gathered together, put on a ship and sent to die. The ship crashes and kills every one of them... except for one: Mordred. This is one of the newer versions of the much-revised legend, however. Earlier versions of the story have Mordred as his nephew, there is no such genocide.
    • In one more recent version, a cunning King Arthur knows how a Genocide Backfire works and instead conscripts all the boys of that age group and makes them squires. All of them but one love him. The one? Mordred.
    • The Arthur, King of Time and Space version was also smart enough to know that You Can't Fight Fate and Merlin even cites the above example of sending them on a ship as just a pointless atrocity. However, the well-meaning but dim Sir Balin only overheard part of the conversation and ordered the ship plan without either of their knowledge, setting up Arthur's inevitable downfall.
  • The Kalevala has this: Untamo kills his brother Kalervo and his clan over petty neighborhood squabbles, leaving only a pregnant woman alive. The woman in time gives birth to Kullervo, who later kills Untamo - and wipes out his clan, for good measure.

  • The Bible provides some examples:
    • In the Book of Exodus, Pharaoh commanded that all male Hebrew babies must be put to death. The lone escapee, Moses, became the freer of the Hebrews. Worst of all, the Egyptians got the infanticide reversed on them when the tenth plague struck down all their firstborn.
    • Jesus Christ. Herod could not kill all the Jewish boys who had been born under the star of Bethlehem because Jesus was in Egypt. And John the Baptist was in hiding in the wilderness with his mother. However, neither Jesus nor John ever actually did anything to Herod; he just died of old age a couple of years later, while they were still small children. (Specifically, he died of chronic kidney disease and Fournier gangrene, the latter of which is often interpreted as Jesus' dad invoking this trope.) Though his grandson, Herod, got killed by an angel for persecuting the early church a couple of decades later.
    • In the Books of Samuel we get the story of the Amalekites, who were commanded to be destroyed utterly by God. King Saul spared the lives of Agag, the King of the Amalekites. The story continues in the Book of Esther, where we have Haman, who descended from that family line and nearly succeeds in getting his revenge on the Jews.
      • Some also say that Adolf Hitler was himself a descendant of the Amalekites and that was what prompted his attempt to conquer the world and destroy the Jews.
    • Books of Kings: Queen Grandmother Athaliah of Judah attempted to extirpate the whole David family line. One boy, Joash, survived...

    Tabletop Games 
  • In the BattleTech universe, during the Clan invasion, Clan Smoke Jaguar WarShips powered up their weapons and glassed a Draconis Combine city in an attempt to break the back of the stubborn Combine resistance. Not only did this serve to alienate their allies, drive the Combine to even greater heights of stubborn defense, but, when a defector revealed the Exodus road, the closely guarded secret route to the Clan homeworlds, the battle cry (and mission) of the armada of the Restored Star League Defense Force was "Clan Smoke Jaguar Must Die!"
    • Similarly, the Kentares Massacre during the First Succession War had this effect. The deliberate murdering of 90% of Kentares IV's population in revenge for the assassination of the Draconis Combine's Coordinator not only put new resolve into a near-defeated Federated Suns (leading to the Suns' Roaring Rampage of Revenge that took back all the territory lost to them), but also caused mutinies, desertions and suicides among the Draconis Combine's military and also lost the DCMS the services of one of the most elite mercenary units of the time.
  • In Rokugan, the setting of Legend of the Five Rings, the Scorpion Clan serve as the Emperor's Underhand. They protect the Empire from hidden or subversive threats, the sort that can't be met with force of arms. Rokugan's CIA, basically. Sounds good, right? Well, the leader of the Scorpion Clan, Bayushi Shoju, discovers some hidden prophecies that foretell the return of the dark god Fu Leng ... at the hands of the last of the imperial Hantei line. So, Shoju does what any well-meaning defender of his homeland would do. He unseals the Bloodsword "Ambition" and uses it to kill the Emperor and his family, while his army seizes the Imperial City in what would later be known as the Scorpion Clan Coup. Of course, the Emperor's weak, borderline-retarded son manages to survive, and when the Coup is inevitably foiled he is installed on the throne with Shoju's widow as his wife, where she proceeds to poison and corrupt him for years until he's so weak that bad things start to happen.
    • Of course, with the rise of Daigotsu, he might have had the prophecy completely wrong anyway.
  • Magic: The Gathering features Garruk, who was forced to join the army as a child. His father hid him instead, and he came back and killed the lord.
  • Warhammer 40,000:
    • Inverted here of all places. When the Imperium first encountered the Tau, they were a race of non-technological primitives living on one world. They were scheduled for routine genocide (it's that kind of universe), but the paperwork got lost somewhere and a Warp storm cut off the Tau system from the rest of the galaxy. A thousand years or so later, and the Tau are the fastest-growing alien empire on the Eastern Fringe, and a major thorn in the Imperium's side. Keep in mind the Tau never realized the Imperium even existed, much less had them slated for death (and the Tau are kept carefully ignorant how just how much bigger the Imperium is compared to them).
    • The Orks have a built-in version where their corpses release spores that eventually grow into orks, and the knowledge of how to make guns, vehicles and starships is hard-coded into their DNA. The only thing to slow them down somewhat is burning the corpses, but even that isn't enough.
    • During the Great Crusade, the obliteration of Monarchia (one of the Word Bearers' favourite cities) by the Emperor's direct order, leaving only a few survivors, as an incredibly brutal object lesson about not worshipping him, ended up motivating the World Bearers to seek new gods who would accept their devotion, essentially making it the spark that ignited the powder keg of the Horus Heresy. As a direct consequence of which the Imperium was doomed to a ten thousand year decline and the Emperor himself was doomed to spend ten thousand years with his half-dead ass nailed to a very fancy chair.

  • The Trojan War Will Not Take Place: Hector claims that the nation he fought was the most barbaric one, so there will no longer be wars because the Trojans killed every child. Except one. Andromache answers that this child will have uncountable descendants, so in some centuries the world will be at total war.

    Video Games 
  • In Ace Attorney Investigations 2, a Fake King, a Dirty Cop, and an Amoral Attorney once teamed up to form an international conspiracy that would Leave No Witnesses. Unfortunately, one little boy managed to escape, and after they spent over a decade trying to hunt him down, he finally snapped, Took a Level in Badass, and decided to strike back at them, ultimately growing up to become the game's Big Bad and Final Boss.
  • In Baldur's Gate II - Throne of Bhaal, almost all the Bhaalspawn is trapped in the city of Saradush, which is sieged by a powerful being attempting to kill them all. It almost achieves his purpose: there is one survivor, you.
  • In Bastion, the Caelondian government had the Calamity created in order to completely eradicate the Ura to prevent them from ever having to go to war again. When he finds out, the Ura scientist that created the Calamity sabotages it so that it destroys the world instead.
  • Eternal Radiance: The Shadowborn destroyed Clearbell Village because the village wouldn't give them an Akleim artifact. The sole survivor of the massacre, Eldareth, joins the organization with the intention of betraying them and destroying them from within. In the end, he doesn't get to unleash a full cataclysm on them, but he manages to kill most of the ones stationed at their base.
  • In Final Fantasy IV, the king of Baron (Actually Cagnazzo, archfiend of Water, in disguise) tries to wipe out the Summoners. He does a pretty good job, but he misses one, the young summoner Rydia. However, it isn't played completely straight in that the backfire mainly came from the main character defecting to eventually take him down rather than Rydia herself. The main character also teams up with Rydia to defeat Cagnazzo's master, who the Summoner genocide was supposed to benefit.
    • In Final Fantasy IX, the summoners of Madain Sari are also wiped out by the Big Bad long before the game... except for Eiko and Garnet, whose mother whisked her away to Alexandria.
    • In Final Fantasy VI, Kefka poisons the populace of Doma, and one of the only survivors ends up being a player character who potentially takes him down. Kefka differs from most examples of this trope as he did it basically for the hell of it rather than some overarching goal of self-preservation.
  • Flip Dimensions: The king of Theiweth enacted genocide on Kazuki's village, causing the latter to become a Dark Lord seeking to overthrow the kingdom. This turns out to be a fake memory due to the multiverse being fiction in Lily's mind.
  • Star Wars: The Old Republic, introduces a heroic version as part of the backstory; A large part of the Sith Empire's motivation is revenge after the Republic exterminated the rest of their society.
  • The Player Character in Jade Empire is the last surviving Spirit Monk, an order who were slaughtered so that the Emperor could steal the power of their goddess, the Water Dragon, to defy the Heavens and end a severe drought. The player character survives because of Master Li's plan and Master Li manipulates him into killing the Emperor for him so that Li can steal both the throne and the Water Dragon's power. In one ending, it works.
  • In Guild Wars: Prophecies, the White Mantle ritually identifies the Chosen and then sacrifices them to their gods; discovering this is what drives the Player Character to turn on the Mantle. Then the Player Character is revealed to also be Chosen...
  • The Lombaxes and Cragmites in Ratchet & Clank Future: Tools of Destruction. The Lombaxes sealed the Always Chaotic Evil Cragmites in Another Dimension, save for one Cragamite child they took pity on. This lone Cragamite, Emperor Percival Tachyon, then raised an army and wiped out the Lombaxes for daring to pity him. But he missed Ratchet (and probably a handful of Lombaxes in other galaxies, such as Angela Cross), who proceeds to trap him in Another Dimension with the rest of his Heartless race.
  • Played with in the Metroid series. Metroid 2: Return of Samus has Samus tasked with exterminating the Metroids on their home planet of SR388; the game ends with Samus sparing a single hatchling, which has imprinted on her. Super Metroid starts off with scientists studying the larval Metroid making the discovery that the Metroids have abilities that could be used for the good of galactic civilization, right before the Space Pirates massacre the researchers and abduct the larva so they can build another Metroid army; the next time Samus encounters the larva, it's grown to horrendous proportions and almost kills Samus before it recognizes her. Then, during the final battle, it performs a truly heartbreaking Heroic Sacrifice, saving Samus from Mother Brain's onslaught and giving her the unstoppable Hyper Beam weapon. (Then Metroid Fusion reveals that the Metroids on SR388 were keeping an even more dangerous threat in check, which is another trope entirely...)
    • Samus herself is portrayed as the sole survivor of a Space Pirate attack on the mining colony of K-2L. Who would have thought that cute 3-year-old girl would come back to bite them in the ass so hard?
  • Iosa the Invincible of Iji had her homeworld Alpha Struck by the Tasen. She didn't take that very well.
    • For that matter, Iji is one of two known human survivors of the Tasen Alpha Strike and subsequent invasion of Earth, and the other is playing Mission Control for her.
  • Halo:
    • The Covenant's attempted genocide on mankind ends up being its downfall. It started in 2525 when the High Prophets found out that the humans were the inheritors to the Forerunners, the species that the Covenant worshiped as gods, and they realized that the truth about it would splinter the Covenant if it ever was spread. They decided to wipe out humanity so that no one would find the truth. 30 years later, the war sets off a chain of events which leads to all the High Prophets being killed, many former Covenant Elites allying with humanity, the Covenant capital High Charity falling to the Flood only to be destroyed by Master Chief, and the Covenant itself now nothing but a myriad of opposing factions.
    • The more direct trigger for the Covenant's fall was when the Prophets ordered their forces to genocide the Elites because the former felt the latter were no longer reliably loyal; instead, the Elites team up with humanity and destroy the Covenant.
    • As first revealed in The Forerunner Saga, the Forerunners and the ancient human interstellar empire fought a devastating war, with the Forerunners winning and literally blasting humanity back to the Stone Age. Unfortunately for them, the humans had plenty of research and experience on the Flood, which was destroyed when Earth fell. Then the Forerunners themselves get wiped out by the Flood.
    • The Haloverse has an even more ancient example, to which this trope applies regardless of which side is telling the story. The Forerunners themselves had Recursive Precursors, called...the Precursors, who created both humanity and the Forerunners. What happens next is rather unclear. According to the Forerunners, the Precursors decided the Forerunners were a mistake and tried to wipe them out; however, the Forerunners struck first, and all but wiped out the Precursors. According to the Precursors, they simply decided that the Forerunners shouldn't have the Mantle, with the Forerunners' attack being completely unprovoked. Either way, the few surviving Precursors broke down into a dust which, 10 million years later, would become the Flood!
  • The third variant occurs in the Age of Empires III: The Warchiefs. Chayton Black has some moral reservations about killing women and children just to help the gold rush along, so he defects to the Sioux he was ordered to kill. This ends badly for Billy Holme.
  • A fairly straightforward case in Bayonetta: the Big Bad Father Balder, the last Lumen Sage, began the Witch Hunts against the Umbra Witches (in which the titular heroine is a member of) more or less For the Evulz. Naturally, Bayonetta stops this plot.
  • In Prince of Persia: The Forgotten Sands for the PSP (there are four different games on different consoles under that title), an ifrit hears of a prophecy stating that a lonely hero with royal blood will kill him, so he starts assassinating people who are part of Persia's royal family. The Prince of Persia, upset over the deaths of his cousins, then tracks down and kills the ifrit. Self-Fulfilling Prophecy.
  • In Metal Gear Solid 2, the Patriots deliberately invoked this when they had Dead Cell liquidated (IE, most of its members killed off) for terrorist attacks it apparently committed. In actuality, the Dead Cell unit was actually framed for the terrorist activities by the Patriots (in other words, it was actually the Patriots who committed terrorist attacks on their own country), and more importantly, they deliberately allowed some survivors to exist in Dead Cell specifically to get them angered enough to attempt to challenge them and more importantly further use them in the S3 plan.
  • In Dragon Quest II, Hargon kills everyone in Moonbrook, but turns the princess into a dog rather than kill her.
  • In Supreme Commander a paranoid Earth Empire commander waged war with the Seraphim and their human followers, but they were easily defeated by their numbers and weapons, in their last ditch effort take them out they unleashed a bio weapon that only targets the Seraphim slowly killing them all. But what they killed was only a very small portion of the Seraphim race who live on the other side of the quantum realm, in Forged Alliance they cross into human realm and conduct their own genocide on the humans.
  • A variant occurs in God of War II. While Kratos is off on his quest to find the Sisters of Fate, Zeus decides to wipe out his beloved Sparta. One soldier (whom you met in the beginning of the game) survives the attempt and tries to seek out the Sisters himself. You end up fighting and killing the poor guy, but not before he tells you what happened to Sparta. This only serves to make Kratos even more pissed and hellbent on taking revenge on Zeus.
  • In the first Homeworld game, this is how the Taiidan Empire meets its end. After the Kushan perfect hyperspace technology, the Emperor decides to invoke a four-thousand-year-old treaty that the race had forgotten, which was that they were not permitted to develop any hyperspace technology. This results in the near-genocide of said race, and in addition to causing the survivors to get royally pissed off and begin a war against them, also results in a massive rebellion rising up due to public outrage of an essentially unprovoked attack on a fledgling race that had just started interstellar travel. By the end of the game, the Kushan fleet and Taiidani rebels assault the Taiidani homeworld in joint force, destroy the defense fleet as well as the Emperor's flagship, then make landfall and shut down the cloning facilities that housed replacements, shattering the Empire entirely except for a few remnants with little power.
    • The backstory reveals that this is how the original Hiigaran Empire fell. They were on fairly even terms with the rival Taiidani, until the Hiigarans got their hands on one of the Great Hyperspace Cores, allowing them to jump whole fleets enormous distances with pinpoint accuracy. They use it to jump their fleet into orbit of the original Taiidani homeworld and lay waste to it before jumping back. Outraged, the Bentusi and the other races demand that the Hiigarans surrender the Core, as they clearly abused its power. Instead of peacefully handing over the Core, the Hiigaran fleet attacked the Bentusi, who promptly wiped out the whole fleet. As a result, the Hiigarans were then defenseless against the pissed-off Taiidani in need of a new homeworld. Cue the Curb-Stomp Battle and the exile (and nearly retributory genocide) of the Hiigarans.
  • In Dragon Age: Origins, during the Human Noble origin, Arl Howe attempts to wipe out the entire Cousland line when the main army leaves Castle Highever to fight the darkspawn. However, thanks to the Grey Warden Duncan, the player survives, becomes a Warden, gains armies of support and powerful allies, and eventually returns to Howe's manor to express your disapproval of his ambitions by rearranging his face.
    • In other origins, the latter still happens but for a different reason. It's briefly mentioned that the only member of the Cousland family to survive was the Human Nobles older brother, who has no involvement in getting back at Howe.
  • The Last Federation: Proving the "good" guys are not immune, Betrayal mode begins, as usual, with the other races exterminating the Hydral, with the Acutians dealing the finishing blow with a moon-drop on their homeworld. In this mode, however, the Last Hydral watches the races they were trying to unite commit this act of barbarism on their people, and rather than finding it deserved... just cannot forgive it. The Acutians are the first to go, followed by everyone else, as the Hydral decides all eight species can go fuck themselves, those who don't leave the system should die, and that it'd be better to revive the Hydral race than try to band the others together.
  • Luminous Plume: 60 years ago, the Praelians coveted the aura magic of the Farulians and slaughtered most of them when they wouldn't share their forbidden techniques. The surviving Farulians, led by Jade, used those forbidden techniques to create Harbingers of Calamity in order to attack the Praelians.
  • Double Subverted in Mega Man ZX and its sequel, Mega Man ZX Advent. In a similar manner to the S3 Plan, Serpent (and ultimately Albert) deliberately spared only a handful of people during Maverick Raids in order to get them to become Mega Men and thus participate in the Game of Destiny to become the Mega Man King. In fact, Serpent himself was a victim of this due to Albert and in his attempts to find out the truth and make something of himself ended up making him perfect prey for Biometal Model W's influence. However, by the end of the game, regardless of the deliberate attempt to spare them or not, it still put an end to their plans and presumably the Game of Destiny by those very created heroes anyways.
  • Genocide attempts has happened quite often in the history of the World of Warcraft, though only a few have backfired.
    • One that did backfired was the attempted genocide that the Mogu tried on their Servant Race the Saurok. To elaborate, after their conquest of Pandaria, the Mogu created the Saurok to police the enslaved races. Soon enough the Saurok realized that the Mogu had no way to control them, since they were given free will and fighting prowess in both sword and sorcery, so a few of their legions rebelled against their Mogu officers. This caused the Mogu emperor to decree the ethnic cleansing of the Saurok race. However 2 Saurok legions were stationed in the Mantid lands at the time, and managed to hide there despite the Mogu sending many armies of slaves after them, arguably since the Mantid were not too happy of having the Mogu invading their territory. Even worse, when the succesor of the Mogu emperor moved his palace to the Krassarang Wilds to oversee the genocide of the Saurok, the surviving legions took him by surprise and threw him off a cliff. Never succeeded indeed.
  • Sine Mora: Enkies are the mass-victims of Fantastic Racism. Enkies are also vital to psychic time travel. The empire (unadmittedly) runs on time travel. DO THE MATH.
  • In the backstory of Hatoful Boyfriend a version of the bird flu becomes so virulent that in two years seventy percent of humanity dies and there's no sign of stopping. In desperation humans created a virus of their own, an "avian annihilation" virus that would kill all birds. It kills many, but in the resistant ones there is another effect and the birds become uplifted, and immediately go to war on humanity. Thirty years later less than five percent of the human population remains and signs a treaty of surrender, and the world belongs to birds.
  • In X3: Albion Prelude, the Argon start a interstellar war after they suicide bomb the jewel of the Earth State, the Torus Aeternal, an orbital shipyard and city ringing the Earth's equator, killing millions from the initial explosion and subsequent deorbiting debris. In response, the Earth State immediately goes on a rampage. In-game, the Terran fleets will handily curb-stomp the Argon courtesy of their technological might and superior capital ships, though plot-wise the Argon use reverse-engineered Von Neumann ships to push the Terran fleet to the brink of destruction. Of course, the Argon never got to finish the job because at that point the Portal Network was shut down by the precursors to stop the genocide, meaning the Argon were suddenly without reinforcements or even a government.
  • In Fallout 4, if the player sides with the Railroad, the Brotherhood of Steel's stated goal to eradicate the Synths and prevent a Robot War gets them eradicated.
  • In the Mass Effect backstory the quarian government launched an attempted genocide of the newly-sentient geth machine race in fear of the geth turning on them. The geth fought back, committed their own genocide that eradicated 99.9% of the quarian population, and the few surviving quarians ended up driven from their homeworld. To add insult to injury they only survived at all because the geth, being unable to fully comprehend the ramifications of wiping out the last 0.1%, let them go.
    • This trope shows up again Mass Effect 3, potentially taken either way. The geth (except for a Renegade Splinter Faction that works as mooks for a third party, who tried to commit genocide on all other life due to their worship of the Reapers) after the war proceeded to occupy the former quarian worlds for centuries and kill anyone who came near, not overtly bothering the outside world but essentially dooming the few remnants of the quarian species to slow extinction due to their biological dependence on said worlds,note  which the geth openly admit they don't need. It gets a bit more complicated as Legion, a geth who can be recruited as a team mate, will also mention the geth are open to peace yet the quarians attack them 100% of the time if they believe they have an advantage. and the conflicting midset in response to their ancestors near genocide causes a large rift in the Conclave. Then in Mass Effect 3 present-day quarians, having developed a new anti-geth weapon, attack and try to wipe them out in an attempt to regain their lost territory. Depending on the player's choices, either the few surviving quarians can eradicate the machines their ancestors created, the geth can wipe out the last descendants of their creators as they are in the process of trying to eradicate them, or clever manipulation of demographics and politics on the player's part can end up in both sides agreeing to a peace.note 
    • In the main storyline itself, although the Reapers make a very effective attempt to erase all traces of themselves and information necessary to beat them before heading out to await the next cycle, it doesn't always work. In the previous cycle they were unaware of Ilos and the last Protheans sabotaged the Citadel's Keepers, preventing Harbinger from being able to remotely activate the mass relay for the invasion. And one Prothean survived in stasis, and became part of the crew that eventually ended the Reapers after an estimated 20,000 cycles of extermination.
  • In Stellaris purging will give an empire a permanent penalty to diplomacy as everyone else suspects they might be next. And if you only conquer part of an empire and purge the planets you seized the rest will dedicate their existence to revenge.
  • In The Elder Scrolls series' backstory, the Atmorans, a barbarian Precursors of the Nords, began migrating to Tamriel from the now-lost continent of Atmora, landing and settling in modern day Skyrim. The Falmer (Snow Elves), who inhabited Skyrim, grew concerned when they started to become outnumbered by the Atmorans. While there are conflicting details regarding exactly what happened that night, the Falmer would attack and massacre the Atmoran city of Saarthal, in an event that would come to be known as "the Night of Tears". Unfortunately for the Elves, Ysgramor and his sons survived. They returned to Atmora and raised an army of 500 of Atmora's greatest warriors. They returned to Skyrim and started a brutal war against the Falmer, which eventually became a full-on Purge, that ended up slaughtering the vast majority of their population. Save for a small population at a very remote monastery, the surviving Falmer were forced to turn to their Dwemer cousins for shelter. The Dwemer agreed to take them in, but only if the Falmer agreed to consume poisonous mushrooms to permanently blind them and essentially become Enslaved Elves to the Dwemer. Following the disappearance of the Dwemer, the surviving modern Falmer are now barely sapient Morlock-like creatures who continue to inhabit the Dwemer's abandoned ruins. However, by the 4th Era, the Falmer are growing more bold, venturing above ground to kidnap surface dwellers while their numbers swell beneath ground. They also seem to be regaining some of their lost sentience, forging better weapons and armor from farmed Chaurus chitin and practicing crude alchemy to create poisons from the plentiful mushrooms that grow in their underground lairs. The author of one in-game book in Skyrim even believes that the Falmer may be preparing to wage war on their surface-dwelling ancestral enemies.
  • In Xenoblade Chronicles X, the Ganglion tried to destroy humanity due to being descended from the Samaarians. This backfired before the genocide had even started as Elma had given humanity faster than light travel and warned them about the Ganglion, and although the Ganglion destroy Earth, Luxxaar is killed by Lao and the Ganglion is, for the most part, destroyed by BLADE.
  • DOOM Eternal: The Maykr have facilitated the sacrifice of numerous worlds to The Legions of Hell for their own benefit. The Doomslayer, secretly empowered by one of their own, proceeds to throw a wrench in their plans to create Hell on Earth and ultimately causes the extinction of the Maykr themselves.

  • In the The Order of the Stick prequel comic Start of Darkness, crusading paladins go and wipe out multiple villages of goblins while seeking the high priest, whose God has a plan that threatens the very fabric of creation itself. In the process, they killed every man, woman and child they could find, but missed two — Redcloak and his brother. In the current story arc, Azure City, the home of the paladins, has been conquered by Redcloak and his armies, and is running the human population into the ground.
    • The reason the paladins of the Sapphire Guard chose genocide as their solution rather than simply hunting down the goblin high priest is that the high priest wears a magical artifact, the Crimson Mantle, linking his mind to the goblins' evil god the Dark One. If the high priest is killed, any other goblin can wear the Crimson Mantle and become the new high priest. Thus, the only way to end the threat forever would be to exterminate every last goblin in the world. (Destroying a divine artifact isn't really something within the power of mortals after all.) Now guess what Redcloak's new name (adopted several years after the genocide of his village) refers to.
  • Linda, brainwashed by the government, actually the Britjas under a false flag, all from It's Walky!, killed all the so-called "Martians" in The '70s. "So-called" because Mars was just an outpost of an intergalactic empire. Of Cthulhu-like creatures who'd been leaving around all that sufficiently advanced Imported Alien Phlebotinum that drove half the comic's plots. This goes about as well as you'd expect.
  • Sometime during the Dominion War in Terinu's past, the human rebels attempted to destroy the Varn Dominion's main power source. Said source consisting of childlike sentient beings known as the Ferin. The Terran Federation trying to both finish the job and keeping the secret from their allied races is a major plot point.
  • A few centuries into the back story of Errant Story, the Elves discovered that some Half-Elves may go crazy and spontaneously develop inexplicable talent in destructive magic. The Elves forbade cross-breeding with Humans and organized a branch of the military to hunt down Half-Elves. They haven't been exterminated— there are at least enough Half-Elves to populate a hidden village— and no prophecy is involved, but one Half-Elf has absorbed a comatose Elven deity and is leading an army of the descendants of the Elves' Human bodyguards to wipe out the last surviving Elven city.
    • Even better: The reason that there's just one Elven city left? They were so smugly arrogant, callous and intractable in their attempted genocide that basically every other power group (including their erstwhile allies and pawns) basically told them where they could shove it. Violently.
    • Even worse: The half-elves learned absolutely nothing from this and tried to commit genocide on the elves in return, thus justifying the elves' genocidal rampage by the end of the war. Millennia later, some of the elves' erstwhile allies and some of the remaining half-elves STILL want to kill off all the elves. This ends about as well for said people as one might imagine, though the elves are less than happy with their rescuers. Probably because the elves are STILL the same genocidal jerks who caused the war in the first place, being immortal and all.

    Web Original 
  • In the reddit series Chrysalis (Beaver Fur), the Xunvir Republic, back when it was still the Xunvir Empire, completely wiped out all life on Earth because a legal tax loophole meant it'd be more profitable than enslaving humanity. Every Human is killed, but a single sentient Von Neumann machine with a massive nuclear arsenal is left behind to return the favor.
  • In Stellaris Invicta, Earth was almost wiped clean of human life by alien invaders. In the recovery period, the Greater Terran Union rose to power, with the single-minded goal of ensuring humanity's survival. When, after centuries, the GTU locates the invaders, a Hive Minded race known as the Tyrum, they use a Planet Cracker to destroy the Tyrum homeworld. The loss of the overmind causes the Tyrum drones living on their colonies to go beserk and massacre eachother. The rest of the galaxy reacts with absolute horror, and the GTU loses what few allies it had left, and is nearly annihilated by a coordinated attack from all other empires. It's not until the War in Heaven starts that the GTU manages to regain some trust.

    Western Animation 
  • Avatar: The Last Airbender:
    • Fire Lord Sozin knew that after he left Roku to die, the Avatar would reincarnate amongst the Air Nomads. So, the Fire Nation managed to kill off the Air Nomads... except for the one kid they were aiming for.note  Aang ends up stopping the Fire Nation later (though they did screw up the world and their own cultural morality pretty badly in those 100 years he was gone).
    • Another complicated invocation of the trope is the Fire Nation tradition of hunting and killing dragons to prove one's mettle as a firebender (again started by Fire Lord Sozin) which apparently pushed the species into extinction in less than 100 years, with Sozin's grandson, Iroh, acclaimed for killing the last pair. When Zuko, Sozin's great-grandson and Iroh's nephew, needs to find the original method of firebending, before it became corrupted by relying on anger, guess who the original firebenders who might have been able to help him were? He ends up finding the last pair, whom Iroh had lied about killing to protect, and is judged worthy of the knowledge he seeks. Not to mention the extermination of the dragons likely made the war effort that much more difficult, because they wiped out their own flying, fire-breathing assets.
    • The Fire Nation had, through a lengthy process, eliminated all but two of the Southern Water Tribe's waterbenders. One managed to escape the Fire Nation's P.O.W. Camp, and used the technique she learned to kidnap Fire Nation civilians and lock them in a cave. The other evaded capture because her nonbender mother took her place, and becomes a member of the heroes' Five-Man Band.
  • Subverted in Drawn Together, where the last survivor of genocide meekly submits to the killer.
  • Invincible (2021): Allen the Alien's people are so determined to stop the Empire because the Empire destroyed their homeworld rather than lose it to their opposition.
  • In the third season of Transformers: Prime, the Decepticons begin cloning an army of Predacons. But when the prototype reveals intelligence and abilities beyond what was planned, Megatron quickly decides that allowing that Predacon (who now goes by the name Predaking) to have his army would be as much a danger to the Decepticons as to their enemies. He knew, however, that this was a risk, and manipulated his foes into doing his dirty work for him. This kept Predaking's attention where Megatron wanted... Until the truth got out. While Megatron himself survived the resulting violence, many who served him were not so fortunate.