History ApocalypseHow / Class3A

* 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.

* Gantz: true to form and fashion, by all the aliens in the series including the latest, a race of giant aliens whose culture and society parallel our own. to make things worse, they have roughly the same backstory as the puritan colonists from england, save for the fact that their planet was destroyed. it seems like they're about to succeed [[spoiler: according to Fraa, this was the objective of every alien in the series thus far; they were all scouts of alien races looking to colonize the Earth and wipe out humanity, which is used as a food source by the latest batch]]

* This is essentially what happened to the planet of Miranda in ''{{Serenity}}'' as the result of a botched Alliance experiment. [[spoiler:The chemical that they created to try to curb people's violent impulses, the Pax, [[GoneHorriblyRight worked a little too well]], causing nearly the entire population to simply lay down and die. The tiny percentage that survived had the exact opposite reaction to the Pax, becoming the psychotically violent and cannibalistic Reavers]].

* The documentary series ''The Future is Wild'' proposes what life on Earth might look like if humanity is no longer a factor in 5 million, 100 million, and 200 million year increments. The lack of humanity is merely a MacGuffin; nothing is mentioned about how or why humanity might go. The Discover Channel broadcast {{Bowdlerized}} it by saying Mankind had simply abandoned the world, and was sending a probe every couple of eons to check on the Earth's progress.

* SuperAtragon: The BigBad is attempting a Class 3a to the Earth's surface while using a method that would have caused a Class 5.

* In VernorVinge's ''Marooned in Realtime'', we find that anyone not in stasis vanished circa 2204. Many hypotheses are raised, without resolution by the author.

* New ''DoctorWho'' series 1 ending: the Daleks are back, and their plan is pretty much this. The Doctor's solution to save humanity? [[spoiler: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.]]

* Well, as the quote above indicates, ''PlanetOfTheApes'' and its sequels.

* Implied in [[spoiler: AdventureTime, considering how there are sunken cities and atom bombs littered on the ground.]]

* In ''Rossum's Universal Robots'', the robots [[TurnedAgainstTheirMasters turn against their masters]] and KillAllHumans 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.

* ''YTheLastMan'' is a 3.5, as every male ''mammal'' on the planet dies, save for Yorick and his pet helper monkey and two male astronauts in space. The cause has been vague, but options include an ancient curse or a [[ScienceIsBad biological experiment gone wrong]]. The comic even mentions that, 7 months after the disaster struck, the first species has gone extinct as its reproductive cycle has flown by. It should be noted that the actual short-term effects look more like a Class 1. The looming fact that this is the last generation as far as most of humanity knows barring serious reproductive breakthroughs is anything but glossed over. [[spoiler:Thankfully, in the DistantFinale, we see that Dr. Mann's cloning research has paid off, and it looks like humanity has made a mostly complete recovery -- complete with roughly the same political problems as before -- making this a Class 1 with a recovery period in the decades.]] In addition, [[spoiler:Even after rats should have died out with no males to propagate the species--almost five years on--some are seen on the streets of Asia, which stuns Mann.]]

* In the ''ReadOrDie'' OVA, the villain plans to play [[{{LudwigVanBeethoven}} Beethoven's]] lost [[{{BrownNote}} "Death Symphony"]] worldwide to wipe out the human race via induced suicide.

* [[spoiler: Implied in AdventureTime, considering how there are sunken cities and atom bombs littered on the ground.]]

* What will be the outcome in ''{{Gantz}}'' if the Giant aliens succeed in their invasion. To make a long story short, [[spoiler: they're trying to turn us into snack food, like an alien equivalent to wings or potato chips.]] [[NightmareFuelUnleaded Think about that for a minute...]]

* ''IHaveNoMouthAndIMustScream'' by HarlanEllison. A giant supercomputer has nuked the Earth and kept the remaining [[IWantThemAlive few humans alive]] in order [[AndIMustScream to torture them]]. Things [[ItGetsWorse get worse]].

* In TomClancy'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.