Planetary-scale Extinction of the dominant Species on the planet, via unnatural causes (ie: someone did something, human
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- The planet Golgafrincham in The Hitchhiker's Guide to the Galaxy: after getting rid of those useless Telephone Sanitisers, its civilisation is wiped out by a virus contracted from a dirty telephone.
Anime and Manga
- Cowboy Bebop, in which the Gate Disaster takes out half the moon and makes Earth uninhabitable for all but the hardiest of humans. It should, however, be noted that the rest of the terraformed planets and moons in the system are okay; Earth is still in contact with the greater solar community, but is regarded as a backwater. This makes this Class 3 in theory, but it's really more a large-scale Class 0.
- The ultimate goal of the Dragons of Earth in X1999.
- What will be the outcome in Gantz if the Giant aliens succeed in their invasion. To make a long story short, they're turning us into snack food, like an alien equivalent to wings or potato chips.
- It becomes an important plot point in Utawarerumono that scientists accidentally roused a malignant god in the distant past and brought about one of these.
- The Tuffle race in Dragon Ball is wiped out by the Saiyans who become giant apes at the full moon. They work under Frieza's planet trade to do this as a career choice.
- Also done when Buu unleashes a Beam Spam of epic proportions from the Lookout and kills every human NOT on the Lookout. He turned them into food and subsequently ate them. He did all that just because he could.
- Super Atragon: The Big Bad is attempting this to the Earth's surface by building a giant ring that—once complete—will cook the Earth's surface with radiation bombardment. Note that this method that would've actually caused a Class 5 if it was achieved.
- This is the Big Bad's goal in Gundam SEED. Due to his method of choice, it just might reach Class 4 or Class 5.
- After War Gundam X came very close to this. It is established that a massive Colony Drop killed 99% of the Human race at the end of the last war. It has recovered since then, however.
- Puella Magi Madoka Magica: It is explained in episode 10 that Madoka herself can cause this. After a few timeline loops, she begins to transform into the incredibly powerful Kriemhild Gretchen, who will wipe out all human life in a matter of days.
- Sakyo's Evil Plan in the latter stages of the Dark Tournament in YuYu Hakusho is revealed to be to create a stable portal between the Earth and the Makai so that demons of every class can pass through, which would result in a Class 2 at the very best, though with the sheer power of demon fighters that we see throughout the series it is more likely to be in this class, possibly even a Class 4 or Class 5, depending on how much plant and animal life the ensuing demon hordes leave behind them.
- Part of the backstory in Attack on Titan. A little over a century prior, strange beings known as Titans appeared out of nowhere and began to devour any humans they could find. The survivors have spent the last century living within three 50-meter Walls, with all information about the Outside World banned and mention that mixed-race heroine Mikasa is the last surviving Asian suggest extinction of multiple ethnic groups. The surviving population numbers in the hundred-thousands, and is under constant threat of extinction from either Titans (if the Walls are broken again), starvation from famine and food shortages, or even civil war due to the corrupt and oppressive government. The series begins with 20% of the population being wiped out when the first of the three Walls is lost.
- In current Martian Manhunter continuity, this is what Malefic did to Mars, using a virus to kill all Green Martians.
- I Am Legend revolves around one of these. Mankind is either dead or zombified to a man, except for Will Smith and a few other people. However, the animals are doing just fine, and in fact have escaped the zoos and colonised the streets of New York. (There are lions.) The original book, however, is a 3b.
- In the movie, dogs and rats are also affected by the virus, although it's not made clear how they're doing in the larger sense. One would assume they had a dieback/zombie rate similar to humans, at least in populated areas, but nothing's said about it one way or the other.
- 12 Monkeys had a virus exterminate 99% of humanity and render the surface uninhabitable to them due to viral residues. No other lifeforms were affected, and the animals have reclaimed the surface.
- The plot of the James Bond film Moonraker is that the villain wants to use a Depopulation Bomb to kill all humans on Earth and repopulate it with a select group of people under his leadership.
- Planet of the Apes and its sequels.
- This is essentially what happened to the planet of Miranda in Serenity as the result of a botched Alliance experiment. The chemical that they created to try to curb people's violent impulses, the Pax, worked a little too well, causing nearly the entire population to simply lie down and die. The tiny percentage that survived had the exact opposite reaction to the Pax, becoming the psychotically violent and cannibalistic Reavers.
- Kurt Vonnegut's Galapagos. Okay, technically the human race does survive in the end, but you can't really consider them human anymore by the time they do get back on their feet. Their brains have atrophied and their limbs evolved into flippers. The ghostly narrator sees this as a good thing.
- Nick Sagan lampshades this in Everfree, saying that it wasn't really the end of the world, because insects survived and thrived. The event itself could probably be called a 2.9 (10 surviving humans.)
- not to mention several thousand cryogenicaly frozen people.
- Cthulhu will do this when The Stars Are Right. Eldritch Abominations running rampant usually falls somewhere between here and Class 5.
- I Have No Mouth and I Must Scream by Harlan Ellison. A giant supercomputer has nuked the Earth and kept the remaining few humans alive in order to torture them. Things get worse.
- In Tom Clancy's novel Rainbow Six, the environmentalist extremists plan this with an engineered disease to wipe the planet clean of all humans except for their own community.
- Oryx and Crake does this with an Synthetic Plague.
- In Stephen Baxter's Titan, China drops an asteroid in the Atlantic to destroy America, but underestimates its force and causes The End of the World as We Know It.
- The basic backplot of Orson Scott Card's Homecoming sequence, although it takes four books before you actually find that out ...
- The "Final War," a major thread in the Bolo series of short stories, is very aptly named: the Terran Concordiat and Melconian Empire pull a Class 3 or worse on every inhabited planet either government has. Usually from ground level, with huge tanks. The overall effect is effectively a Class 2 on a Galactic scale.
- Mephisto, a recurring Big Bad from Michael Slade's RCMP thrillers, plays Xanatos Speed Chess with this as his objective.
- Signal to Noise by Eric S. Nylund ends with the world as a barren wasteland due to deceleration - the engineered part comes from the alien that gave humans the technology that caused the deceleration in the first place - in the second book A Signal Shattered explains that Wheeler specifically caused the destruction of earth so that the protagonist would have something in common with a group of aliens on the run from Wheeler - to lubricate the brokering of a deal!
- Margaret Atwood's "Flood" trilogy had a engineered disease that was intended to be a Class 3 - wiping out humans and replacing them with a genetically modified humanoid species, but, as of the publishing of the first two books, it seems that it will be a Class 2 bordering on high Class 1
- In Octavia Butler's Xenogenesis trilogy, the last few human survivors of a nuclear war are rescued by aliens; but, although they'll be returned to a fixed-up Earth, they won't be human any more.
- Geologist Dougal Dixon wrote (and illustrated) the literally science fictional After Man, a really quite detailed description of the various ecosystems of Earth 50 million years from now, with the base assumption that humans go extinct some time "soon" in geological terms (i.e. within the next 100,000 years or so).
- Spiral, the second book in Koji Suzuki's Ring trilogy ends like this. Sadako's curse will inevitably spread across the world, destroying the human species. That is, of course, until the next book turned everything on its head by revealing that it all took place inside of a computer
- In the short story "Dark Benediction" by Walter M. Miller, a mysterious disease called neuroderm causes society to collapse. It turns out the "disease" is a microorganism sent by another civilization to help humanity, not destroy it.
- In Primeval the not too distant future appears to be populated entirely by giant mutant bat things that we unleashed upon ourselves. The series is non-specific if this has wiped out humanity entirely in a full Class 3, or just mostly, but given the ferocity of the future predators and the abandoned state of cities it is at least a 2. The Big Bad does state we've wiped ourselves out, but we're not about to take a villain's word for it just yet and the series does fall on the idealistic side of the Sliding Scale so there may yet be hope. Given the geologic time-scales with which this series usually plays around, the Future Predators may not have originally played any direct role in humanity's downfall. It's just as plausible that they evolved naturally, long after we'd gone extinct, and that they would never have met humans if the Anomalies hadn't brought some into the present.
- In Star Trek: Voyager, the Krenim had developed a weapon to delete people from history. Any offworld colonies they would have made would be retroactively removed from history. Addendum: If these civilizations had Terraformed any uninhabitable worlds, those would become Class 5 as the habitable world would never have been made habitable in the first place (at least by the people who made them so in the original timeline). It might fit Class X-2 more, because it shows that it's able to erase inorganic objects as well (Chakotay's talk with Annorax regarding simulation of erasing a comet), but the main show of the weapon is to specifically delete races, but left the planet intact for the Krenim to get it in new timeline.
- An environmentalist conspiracy called "The Dawn" was alleged to be plotting to achieve this, in the short-lived TV series Strange World.
- New Doctor Who series 1 ending: the Daleks are back, and their plan is pretty much this. The Doctor's solution to save humanity? Kill at least ALL intelligent life on or near Earth, Dalek and human (granted, he didn't have time to actually remove the 'and human' bit from the weapon). And he squicked at holding a gun on a guy. The Daleks talk him out of doing this because it'd give him ANOTHER genocide on his record.
- The gaseous Gelth plan to kill all humans, and inhabit their corpses.
- In LOST, if the Man in Black manages to escape the Island after being stuck there for two millenia, he plans to wipe out all human life.
- According to Rich, In the Community episode "Epidemiology", a Class 3 would occur within a year and a half. However, seeing as everyone is cured by turning the thermostat down to 58 degrees, one suspects this virus might have a little trouble making it out of Colorado.
- In the 2000 two part episode of The Outer Limits "Final Appeal" it's revealed that all episodes are alternate timelines and futures and that while many of them actually are tied together into semi coherence. the episode ends with a time traveler with a grudge detonating a fusion bomb taking out most of the eastern seaboard, rendering their arguing about this timeline's rejection of tech stronger than a light bulb pretty much moot.
- Known to happen in Warhammer 40,000, if rarely - the setting's instruments of devastation tend to be... not as picky as this type of apocalypse requires. Nevertheless, the Eldar, especially of Craftworld Biel-Tan, are fond of utterly excising any human/ork/anyone colonies on the Maiden Worlds and returning the planets to their pristine state, conveniently erasing any sign that the world is under Eldar protection.
- In R.U.R., the robots turn against their masters and Kill All Humans except for one. One is too few to reproduce, but the robots don't know how to do that either. So the lone survivor creates an Adam and Eve robot couple who will repopulate the world with their descendants.
- Little Shop of Horrors. The entire human race is eaten alive by giant bloodthirsty plants, and the sung narration explicitly points out that they have no one to blame for it but themselves.
- Chrono Trigger, at least after the Day of Lavos. It's clear that a few isolated pockets of humanity have survived Lavos' wrath, but it's also clear that those isolated pockets are screwed, no matter how much "hope" is spread by the main characters. Luckily, the theme of the game is Time Travel...
- The second and third endings of Drakengard fall into this sort of apocalypse. The third has a glimmer of hope that it can still be averted.
- Persona 3's bad ending is strongly implied to be this — the end of all human life on Earth, due to the collective nihilism of man.
- Star Control 2 has several variants. First, the Dnyarri (psychic slavers) ordered the destruction of the Taalo, who were immune to psychic control; it's implied that the Taalo may have slid to another dimension or universe, though. Much later, the Androsynth poke around that area of space, and are then replaced by the Orz, who don't like to talk about it. The Ilwrath will wipe out the Pkunk if you don't intervene, and the Ur-Quan Kohr-Ah — former slaves of the Dnyarri — will wipe out everyone if you don't solve the game.
- In the original Descent: FreeSpace, the Nigh Invulnerable Shivan mothership Lucifer blasted the Vasudan homeworld of Vasuda Prime to an uninhabitable ruin, killing four billion Vasudans (and considering that Vasuda Prime was largely an extremely arid desert, there could not have been much more than four billion people there). They almost did the same to Earth, but the Lucifer was destroyed in subspace, where its shields were down, mere minutes before arriving in the Sol System. Unfortunately, the only subspace node leading out from Sol was destroyed in the process, meaning that Earth was cut off from the rest of human civilization, and vice versa.
- The final foe in Tales of Vesperia, while mostly apathetic towards humanity throughout the game, attempts this when things hit the fan in an attempt to preserve the planet at the cost of those who have done the most damage to it.
- In Wing Commander III, Class 3 is the potential fate for Locanda IV (Robin "Flint" Peters' homeworld) due to Kilrathi bioweapons aboard missiles fired at the planet. As per the novelization, canonically the Victory's wing fails to intercept the bioweapons.
- The crux of Wesker's ultimate plan in Resident Evil 5, wherein he attempts "complete global saturation" of Ouroboros (as he puts it) to rid humanity of its weaker kin and leaving those who can endure it's horrifying effects to inherit the land.
- The Combat Of Giants: Mutant Insects games has a meteor that annihilated humanity and civilization. The game itself took place 300 years later where giant mutated insects rule the world.
- Bob and George We're willing to kill everyone on the planet to stop you! This being Bob and George, people at the site of the asteroid strike survive.
- Jack. The full story still hasn't been presented, but apparently humanity was killed in a jihad by genetically engineered furries. Although it's hinted that by reincarnation and God arranging for history to repeat itself, the furries basically became humanity and vice-versa
- In Homestuck, Gl'Bgolyb's death caused the Vast Glub, a psychic shockwave that killed every Troll in the universe. The 12 Players only survived because they weren't in the universe at the time. Her Imperious Condescension and The Handmaid also survived.
- If SCP-1101 of the SCP Foundation breaks containment, it's possible that humanity will go extinct as every single human on the planet neglects basic bodily needs in favor of debating a particular subject, like whether or not tomatoes are a fruit or vegetable.
- In the 1939 animated short Peace on Earth, a civilization of cute little animals springs up after the human race wipes themselves out in endless trench warfare. In the 1955 remake Goodwill Towards Men, naturally, it's The Bomb that did mankind in.
- Though it wasn't his intention, Vandal Savage did this in the Justice League episode Hereafter (Part II). Being immortal, he ends up very lonely.
- Implied in Adventure Time, considering how there are sunken cities and atom bombs littered on the ground.
- While technically not a human example, the Martians in Invader Zim worked themselves to extinction turning their planet into a giant spaceship. "Because it's cool!"
- According to a theory based on genetics, a volcanic eruption 70,000 years ago reduced the human race to between 1000 and 10,000 breeding pairs. If this is true, then it's the closest we've had to a worldwide Class 3.