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Sometimes, a story starts out with a small conflict, but then escalates to the point that the hero's party has to save the entire world. A MinorCrimeRevealsMajorPlot may be involved.

It doesn't matter what the party's original goals were (or those of its members); they're going to end up SavingTheWorld from an unstoppable, inconceivable threat - and since YouCantThwartStageOne, they will only defeat said threat only when the world is right on the brink of doom.

A common manifestation is that despite the all-encompassing nature of the threat, [[ItsUpToYou no one else]] in the world [[WithThisHerring will assist them]], or [[ApatheticCitizens even care]]. [[NoHeroDiscount Forget about receiving a " saving-the-world discount" from shops]], or a few armies to help them [[StormingTheCastle storm]] the BigBad's lair.

Compare GrandFinale, where the scope of a serial work is [[SerialEscalation expanded]] for the final ([[StoryArc couple of]]) episode(s); BigDamnMovie, where an [[TheMovie cinematic adaptation]] of a smaller-scale work has a Save the World Climax plotline; MinorCrimeRevealsMajorPlot (formerly GonnaNeedABiggerWarrant), which is about the investigation of a small crime leading to the discovery of a major crime/conspiracy; and SequelEscalation.

A hero who finds himself drawn into this task may find his character archetype subject to MessiahCreep.

As a PlotTwist trope, expect spoilers.
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!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* For much of ''LightNovel/ScrappedPrincess'', [[SwordAndSorcerer Shanon and Raquel's]] only goal is to protect their adopted sister, Pacifica, from the Church of Mauser. It isn't until they're captured by Princess Senes that they learn the truth about the church, [[ApocalypseMaiden Pacifica]], and [[ChosenOne themselves]], as well as [[TheEndOfTheWorldAsWeKnowIt what's really at stake.]] Shanon and Raquel then realize that they're protecting far more than their sister.
* ''Anime/OriginSpiritsOfThePast'' starts with a FishOutOfWater exploring a new world and ends with saving the WorldTree.
* ''Manga/{{Naruto}}'' starts with the misadventures of a bratty outcast in search for recognition, and ends with saving the planet from an AssimilationPlot.
* ''Anime/NeonGenesisEvangelion'' plays with the trope: ''every'' fight has the fate of humanity hang in the balance, but it's all a plan by a few fractions of humanity to initiate the end of the world on their own terms. As their plans collide, the end of the world ends up in the hands of a mentally fractured teenager, with disastrous results.
* ''Anime/CodeGeass'' starts being about a fallen prince's vendetta against his country of origin and a terrorist group struggling for their country's independence, and ends up being about saving the world from one AssimilationPlot and two nigh-omnicidal well-intentioned extremists in quick succession.
* Part 6 of ''JojosBizarreAdventure'' follows this. It starts as a prison drama about an inmate trying to reclaim her father's memories, then becomes a race to prevent a crazy priest from resetting the universe. [[spoiler: They fail.]]
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[[folder:Film]]
* ''Film/{{Star Wars}}'': Luke Skywalker is your average moisture farmer living in the dusty ass-end of nowhere when BAM! This random astromech droid starts playing back a message from a princess in need of saving from the BigBad. Being the impressionable young man he is, Luke embarks on a mission to rescue the {{Damsel in Distress}} and maybe discover something about himself aling the way. Simple, right? Wrong. Before Luke has time to say [[{{OncePerEpisode}} 'I've got a bad feeling about this']], he's undertaking a [[{{LaResistance}} pivotal role in the war to overthrow]] the [[{{TheEmpire}} evil Empire]] and confront his destiny to decide the final battle between Good and Evil.
** Oh, and before I forget, the damsel in distress that Luke totally open-mouth-tongue kisses is actually his twin sister and the BigBad is his biological father.
* ''Film/{{Constantine}}'': John Constantine is hired to investigate a suicide. In the end, he tries to stop a conspiracy to bring the son of the Devil on Earth.
* ''Film/TronLegacy'' is originally about rescuing the previous film's protagonist from imprisonment in virtual reality, and ends up being about saving the world from an invasion by a fascist AI.
* 2013 comedy ''Film/TheWorldsEnd'', the last film of the "Three Flavors Cornetto" trilogy is about a group of old friends who reunite to re-enact a legendary pub crawl from their youth. At some point their pub crawl becomes a battle to save the human race.
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[[folder:Literature]]
* Creator/ChinaMieville's ''Literature/{{Kraken}}'' starts with Billy Harrow investigating a minor mystery about a disappearing squid, and eventually escalates to doomsday cults and eldritch horrors trying to end the world.
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[[folder:Live-Action TV]]
* ''Series/BabylonFive'' starts out with rather minor border skirmishes between the Centauri and Narn, some diplomatic tensions among other races, and an Earth Government moving slowly in a xenophobic direction. When [[BigBad the]] [[AbusivePrecursors Shadows]] reemerge into galactic affairs, they manipulate and cultivate these existing tensions into a galaxy-wide war among the younger races which escalates to an apocalyptic scale.
* ''Series/{{Star Trek Deep Space Nine}}'' starts with the Federation taking over an old starbase from the Cardassians who'd recently withdrawn from a long brutal occupation of the planet Bajor which the starbase orbits. Episodes involve the rebuilding of Bajor and its various growing pangs of independence (and bitterness over its recent past), and some exploration through a wormhole recently discovered near the station. But a great power lay on the other side of that wormhole, which soon puts the whole Alpha Quadrant in jeopardy in the large-scale Dominion War.
* ''Series/BuffyTheVampireSlayer'': The titular character starts out just trying to kill the local vampires, but quickly starts having to thwart the attempts of an old, powerful vampire, the Master, who is trying to get out of the magical cage he is trapped in. By the end of the season, she has to stop the Master from opening the Hellmouth, and act which would lead to a flood of demons entering the world and destroying all human life. The second season escalates the threat from "just" loss of all human life to loss of the very existence of the world.
* ''Series/{{Supernatural}}'': The show starts with two brothers hunting ghosts, werewolves and other supernatural creatures in the US while looking for their father. In the fifth season, they're trying to prevent the Biblical Apocalypse from occurring.
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[[folder:Radio]]
* ''Radio/BleakExpectations'' starts out as a straightforward (if often surreal) parody of CharlesDickens' life stories such as ''Literature/GreatExpectations'' or ''DavidCopperfield''. Thanks to SerialEscalation, by series two the antagonist has [[WesternAnimation/TheSimpsons crossed the line from everyday villainy to cartoonish supervillainy]], and in the SeasonFinale the hero has to save the world from an AlienInvasion.
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[[folder:Video Games]]
* ''VideoGame/{{Persona 4}}'' starts off with a group of friends discovering the (supernatural and thus unprovable) MO of a SerialKiller and resolving to catch him. If you manage to unlock the true ending it turns out [[spoiler: to be a conspiracy by an EldritchAbomination (disguised as [[TheDogWasTheMastermind a gas station attendant]]) to bring about TheEndOfTheWorldAsWeKnowIt]].
* ''VideoGame/FinalFantasyIV'' begins with Cecil's demotion for questioning orders and being sent to deliver a package. This spirals out of control until you find yourself going to the Moon, fighting a {{Humongous Mecha}} that is going to annihilate all life on the planet, and then doing battle with the incarnation of all evil.
* ''VideoGame/FinalFantasyVI'' starts off with a mysterious girl named Terra working for the empire due to a form of mind control. She has no knowledge of who or what she is. When she gets knocked out in a mission, a treasure hunter named Locke quickly helps protect her. Before long she's helping TheResistance fighting against TheEmpire. The Empire itself poses a threat to the world, but the emperor himself would never go so far as to destroy it, which his seemingly comic-relief jester Kefka goes ahead and does just that. The world now in ruins, the heroes know that they at least have to stop Kefka from destroying all existence since he'd already gone that far.
* ''VideoGame/FinalFantasyVII'' starts with a resistance group known as Avalanche fighting against the Shinra MegaCorp just to help improve the lives of the citizens that live in the slums. One thing turns to another and eventually they're fighting a psychotic SuperSoldier who wants to destroy the world.
* ''VideoGame/FinalFantasyIX'' starts with a performance troupe putting on a play as a distraction while they kidnap the princess from her domineering mother of a queen. One thing leads to another and soon a weapons merchant is threatening the destruction of not one, but TWO different worlds. [[spoiler:[[GiantSpaceFleaFromNowhere And then the personification of Death shows up to determine whether the universe itself is worthy of existence.]]]]
* ''VideoGame/XenoGears'' starts off with Fei just living his normal life in a quiet village, devoid of conflict. Then TheEmpire invades and razes the town to the ground, forcing him to defend himself in the heat of the moment. One thing leads to another and then he's fighting against a man-made God to save the world.
* ''VideoGame/NeverwinterNights'':
** The original campaign begins with the effort to find a cure for the plague ravaging Neverwinter. It ends with Neverwinter fighting a full-scale war, and you trying to prevent the entire Sword Coast from falling back under the dominion of a 30,000-year-old [[ReptilesAreAbhorrent sarrukh]] queen.
** ''Hordes of the Underdark'' begins with drow raids on Waterdeep, and ends with [[EvilerThanThou a goddamn archdevil]] trying to take over Faerun.
* It's easy to forget these days that ''Franchise/MassEffect's'' Commander Shepard wasn't born killing Reapers. [[LateArrivalSpoiler Minus out-of-character knowledge]] you start the first game expecting an apprenticeship of sorts under a turian Spectre named Nihlus. [[ItWasHisSled That isn't the case for long.]] And until the Reapers actually arrive in ''VideoGame/MassEffect3'' the only folks who believe you and are willing to help are the ones who either know you personally (your squad and crew, mainly), and crazies like the Illusive Man.
* Particularly galling in ''IllusionOfGaia'', where your goal is generally exploring ancient ruins and collecting mystic statues.
* Crono from ''VideoGame/ChronoTrigger'' wants nothing more than to go to the Millenial Fair, but ends up roped into a {{time travel}}ing quest to save his planet from annihilation at the hands of an incomprehensible EldritchAbomination.
* ''VideoGame/SkiesOfArcadia'' spends most of its time as a charming adventure revolving around exploration and piracy... until the final ten hours or so, when TheVeryDefinitelyFinalDungeon is raised from the depths of the planet, a devastating superweapon is unleashed, a country is leveled, and {{Heroic Sacrifice}}s abound.
* ''VideoGame/DragonAgeOrigins'' plays with this trope. While ''technically'' you are saving the world by stopping the Blight (i.e. a vast horde of [[AlwaysChaoticEvil evil]] [[TheLegionsOfHell monsters]] led by a corrupted Dragon-God), the game's codex makes it quite clear that failure on your part will not actually lead to [[TheEndOfTheWorldAsWeKnowIt the end of the world]]. Blights reoccur every few centuries in Thedas, so people who dedicate their lives to stopping them have created a military organization, the Grey Wardens, just for that purpose. If you do not succeed, then one of the other members of your organization, which is thousands strong, would finish it in your place. By stopping the Blight, all you really do is keep the country that you live in from being destroyed before the other Wardens could act. Your victory simply means that the threat ended before the rest of the world noticed the problem.
** ''VideoGame/DragonAgeII'' averts this: [[spoiler: Templars and mages ''will'' end up fighting one another]], but [[ForegoneConclusion how that]] [[FramingDevice comes about]] is up to [[PlayerCharacter Hawke]], who can end up either [[spoiler: a symbol of rebellion or an accessory to a war crime]].
* ''VideoGame/{{Warcraft}} III'' starts with Thrall leaving the continent to find another one where [[OurOrcsAreDifferent his people]] can find a place to leave in peace, while Arthas investigates an epidemic. He then fights against a growing army of undead that threatens his kingdom. The climax has every faction of the world making a LastStand against TheLegionsOfHell who want to destroy all life in the universe.
* ''VideoGame/BurningRangers'' at first starts off as you playing as a futuristic fire fighting crew that tackles raging fires and rescue survivors. However, near the end of the game [[spoiler:the Rangers discover an inferno satellite that is collecting space debris from across the galaxy that's on a crash course with Earth. The Rangers therefore quickly head into the ship's central core in an attempt to destroy the satellite and save the world.]]
[[/folder]]

[[folder:Web Comics]]
* ''Webcomic/TheOrderOfTheStick'': The first arc of the story concerns the Order carrying out a standard dungeon crawl in order to defeat a lich. Then the next arc reveals that within the dungeon was a gate to a prison dimension where a world-destroying EldritchAbomination is kept, and the lich was planning to use the gate for nefarious ends. The rest of the story concerns the Order's efforts to keep the other gates from being used for evil, so that the abomination isn't set free to destroy the world.
* ''Webcomic/CityFace'' parodies this. It starts off with a pigeon named City Face attempting and failing to woo an attractive female pigeon. A fairy shows up to help--and she tells him that the continued existence of the world depends on City Face successfully winning the female pigeon's heart.
[[/folder]]

[[folder:Web Original]]
* ''Literature/{{Worm}}'' starts out as a superhero story with primarily street-level conflicts. The last few arcs of the story, however, feature a threat that could wipe out humanity in not just one world, but every possible reality.
[[/folder]]
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