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[[quoteright:253:[[VideoGame/StarOceanTillTheEndOfTime http://static.tvtropes.org/pmwiki/pub/images/the-constant_star-ocean-tetot2_4298.png]]]]
[[caption-width-right:253:[[Franchise/PlanetOfTheApes You maniacs!]] You built it up!]]

->''"It's called a [[TropeNamer constant]]. Desmond, you have no constant. When you go to the future, nothing there is familiar. So if you want to stop this, then you need to find something there... something that you really, really care about... that also exists back here, in 1996."''
-->-- '''Daniel Faraday''', ''Series/{{Lost}}''

When you TimeTravel, or you spend some time as a HumanPopsicle, or even just leave a place for a long time, things tend to change a lot. But even when almost everything has changed, there's some character or thing that exists in both time periods, not because of time travel, but because they [[TheSlowPath remained there the whole time]]. They are The Constant, and they connect two different-looking settings together and prove they're the same place.

Frequently the work will go out of its way to make a point of The Constant, and in our examples we focus on these intentional, obvious Constants. If the time-traveling character didn't realize they were in the same place until discovering The Constant, then you have EarthAllAlong.

If the time traveled was too short, there may be so many Constants that it's unremarkable. For example, it's not uncommon for the entire cast from the past to switch to FutureBadass versions of themselves in the future. On the other hand, there is no minimum time difference - a city may be reduced to an unrecognizable place overnight by a terrible weapon, except for The Constant proving it was there. Or as Nena would say, "If I could find a souvenir / Just to prove the world was here."

If the time traveled is very long, the Constant will typically be a structure or an immortal rather than an ordinary person. If it is a person, it's usually the IdenticalGrandson or a variation thereof (such as MyGrandsonMyself).

Compare EarthAllAlong, MonumentalDamageResistance. Often invokes NeverRecycleABuilding.

If everything inexplicably survives in a slightly distressed state, it's a case of RagnarokProofing.

If the Constant in question ends up being destroyed in real life (e.g. the World Trade Center), can result in a FunnyAneurysmMoment.

[[noreallife]]
----
!!Examples:

[[foldercontrol]]

[[folder: Anime and Manga]]
* ''Anime/CowboyBebop'': When the [[HumanPopsicle de-frosted]] ([[DefrostingIceQueen on two levels]]) amnesiac Faye Valentine returns to Earth, she meets an old classmate of hers, now an old lady.
* The Sacred Tree in ''Manga/InuYasha''. In the past, it's where Kagome meets the titular Inuyasha; hundreds of years in the future, it's still tended by her grandfather, even though a modern city has grown up around it. The nearby Bone-Eater's Well also exists in both times and acts as a PortalToThePast while it's at it.
* In the movie ''Anime/Pokemon4Ever'', the young woman Sammy meets is an old woman 40 years later when he meets her after a time trip.
[[/folder]]

[[folder: Comic Books]]
* The American Flag in ''ComicBook/TheUltimates''. The newly thawed out Captain America is despondent over how different things are. Technology has advanced massively, his high school friends, fiance and army buddies are in their 80s and modern morality is completely different than the 1940s. That is until Nick Fury points out the American flag over a cemetery and comments that one thing hasn't changed. (Well, except those two extra stars from 1959.)
* Robert Crumb's ''Mister Natural'' once had an immensely satisfying meditation in the desert. It starts when he arrives in a desolate spot, spreads out his blanket and assumes the lotus position. Some indeterminate time later, construction workers arrive to build a road past him. He remains transfixed even when junk thrown from passing cars bounces off his head. Eventually a small town grows up around him, and after what appears to be years of development he is finally noticed as a policeman brusquely orders him to move, he is blocking the traffic. (Apparently they managed to [[FridgeLogic build the sidewalk under him]].) The guru's only answer is a [[BrownNote slowly rising hum]] that after a few panels causes the officer to flee in panic as the buildings around them crumble into dust. Once the location is back to its original state (you know, apart from the fact that the "sand" now consists of pulverized concrete, glass and asphalt) Mr. Natural stops humming, gets to his feet, stretches and yawns, declares "That was a good one!", rolls up his blanket and wanders off.
* VandalSavage acts as this sometimes for the DCU, since his complete unkillability allows him to survive pretty much any changes that would kill off everyone else.
[[/folder]]

[[folder: Film]]
* The Christopher Reeve movie ''Film/SomewhereInTime'' features an elderly hotel employee who recognizes the hero from his childhood - much to the hero's confusion, because from his perspective that event hasn't happened yet (he later goes back in time and meets a boy in the lobby who is clearly the same guy).
* In ''Film/{{Inception}}'', the folks who enter dreams carry a "totem", a small personal item that they alone know the exact size and weight of, to help them remember if they are in reality or dream state if need be. For instance, lead protagonist Dom carries a top that will spin endlessly in a dream, but topple in reality. Growers of EpilepticTrees may find some fertilizer in the observation that [[spoiler:the viewer does not see it topple before the movie cuts to credits]].
** [[spoiler:Although WordOfGod states that it does in fact topple.]]
* The Statue of Liberty in the ''PlanetOfTheApes'' movie that features so prominently in the EarthAllAlong.
* The Clock Tower in ''Film/BackToTheFuture'' in a major example of this trope, as it appears under construction in 1885, working just fine in 1955, broken and run-down in 1985, transformed into a casino-hotel in the alternate 1985, and as a piece of high-tech modern art in 2015.
** Doc Brown serves as one in the first film, as well, moreso than Marty's parents or Biff, as he is aware that Marty has been time-travelling.
* In the GeorgePal version of ''[[Film/TheTimeMachine1960 The Time Machine]]'', the protagonist finds a couple of constants during his early trips into the near future, including his friend Filby, and a shop near his laboratory that is featured in the time-travel montage whipping through a succession of window displays (later spoofed in the Literature/{{Discworld}} series, as described below). However, on his main excursion into the distant future he finds that everything has changed.
* In the Guy Pierce version of ''[[Film/TheTimeMachine2002 The Time Machine]]'', he meets an AI librarian from the New York Public Library who is still there in the overgrown, recognizable ruins of New York thousands of years later.
* In ''Film/DemolitionMan'', Spartan meets the helicopter pilot who air-dropped him into his final mission before becoming a HumanPopsicle. Despite Spartan's difficulty adapting to the future, he never bothers to sit down with the old guy and pick his brain.
* Like ''Franchise/StarTrek'' below, ''Franchise/StarWars'' gives the audience a few constants when telling a story in a new time period: ''Film/ThePhantomMenace'' has no Rebellion and no Empire, with a strange Republic and Trade Federation in their places; but we know it's the same 'verse because we see Obi-Wan from the beginning, and Artoo and Threepio, Yoda, and Tatooine later on.
* Both the film ''FieldOfDreams'' and the novel ''[[WPKinsella Shoeless Joe]]'', make note that baseball has still remained the same. In the movie, [[Creator/JamesEarlJones Terrance Mann]] even calls it this trope.
-->"The one constant through all the years, Ray, has been baseball. America has rolled by like an army of steamrollers. It has been erased like a blackboard, rebuilt and erased again. But baseball has marked the time."
** This is subverted in a scene in the comic ''Spider-Man I (Heart) Marvel: Web of Love'', where Captain America is seen watching a basketball game on TV with his Avengers pals and Mary Jane Watson-Parker. Confused by the rules added to the game since the 1940s and the resultant new tactics, he comments that at least baseball remained unchanged. Then Luke Cage brings up the designated hitter rule...
* Inverted in the James Garner film, ''ThirtySixHours''. The existence of something that should have vanished in a few days, [[spoiler: a paper cut]], is what convinces Maj. Pike, that he ''hasn't'' spent the last few years in a fugue state, as his German interrogators are trying to convince him he has in order to extract information from him.
* In Film/{{Idiocracy}} a "Fuddrucker's" restaurant serves as the constant. After 500 years of increasing stupidity the name has gradually changed to "Buttfucker's." Oddly, it retains its status as a family restaurant, while Starbucks, H&R Block, and several other businesses have become brothels.
* In ''Film/DemolitionMan'', every restaurant is a Taco Bell (or a Pizza Hut, [[ProductPlacement for Europe]]).
[[/folder]]

[[folder: Literature]]
* Marvin the Android serves as TheConstant in ''Literature/TheRestaurantAtTheEndOfTheUniverse'' (both the book and the place) over a few hundred million years. He's understandably bitter about it.
* In Susan Cooper's novel ''Literature/TheDarkIsRising'', the immortal Will Stanton meets the character Hawkin hundreds of years in the past. Hawkin undergoes a FaceHeelTurn and becomes the Walker, condemned to WalkTheEarth until it's time for him to fulfill his destiny in the present.
* In Creator/DianaWynneJones's ''Literature/TheHomewardBounders'', the Old Fort - in particular, the statue on the grounds - are the Constant. [[spoiler:So are the canal arches, and the sign identifying the former Churt House.]]
* Katharine Kerr's ''{{Literature/Deverry}}'' series:
** In ''Daggerspell'', a battle is fought among the ruins of a fortress at the edge of the grasslands. Several books later, we are shown in ''A Time of Exile'', in a story set a few hundred years prior, how the building of that fortress started a small war, and why it was abandoned. Brangwen's grave is another straight example.
** Averted when Nevyn, now a royal adviser, tries to find his old quarters in the royal broch in Dun Deverry - and cannot, because the complex has been repaired and expanded so many times over the centuries since he was condemned to WalkTheEarth.
* In ''TheChroniclesOfNarnia: The Silver Chair'' the heroes are directed by Aslan to go to the Ruined City of the Giants and look for [[PlotCoupon a sign]] that would tell them where to go. Not seeing anything, they are trapped in a snowstorm and forced to hide in a series of trenches. They [[ThatsNoMoon realize their mistake later]] when [[TheRuinsICaused returning to the site]], they see the trenches were actually letters on a giant inscription:
--> '''Though under earth and throneless now I be, Yet, while I lived, all earth was under me.'''
** The city was gradually reduced to ruins, until all that was left was the inscription. Finally all that remained of the inscription was the final two words: "UNDER ME."
*** The long version is according to the antagonist, who is clearly trying to distract the heroes from their quest. The literal meaning is clear: Look under the inscription.
** And in ''Prince Caspian'', the Pevensies return to Narnia and Susan finds one of their old chess pieces, and they realize that they're in the ruins of Caer Paravel.
* In UrsulaKLeGuin's short story "April in Paris", the protagonists occupy the same apartment in different centuries. Notre Dame is another Constant.
* In ''TheTimeTravelersWife'', Claire generally serves as Henry's Constant as he jumps around in time.
* In HBeamPiper's ''Lord Kalvan of Otherwhen'', the absence of an expected constant - the stone quarries of an area of Pennsylvania that the protagonist knows quite well, and which could not have eroded while leaving the local geography intact - tips him off to the fact that he has ''not'' [[TimeTravel travelled into the far future]] as he previously thought, but is in an AlternateUniverse.
* Lampshaded in the Literature/{{Discworld}} novel ''Discworld/WyrdSisters''. The biggest expense of TimeTravel is finding a fashion store that will remain open for 50 years in the exact same place.
* A ''StarWars'' novel has someone who was nearly killed at the end of the Clone Wars and put into stasis for at least half a century, awaking long after the ''original'' movies. With almost everyone he knew long dead and the galaxy having gone through several wars and governments, he decides to search for a specific Constant, the YT-1300 freighter he was flying on the mission where he nearly died - the ship that has since come to be known as the ''Millenium Falcon''.
* RobertRankin's Brentford series has Professor Slocombe, who is implied to have been Merlin and have worked with Sherlock Holmes. Also, the Flying Swan, which shows up on 15th century maps. Ironically, the real-life pub the Flying Swan is based on, the Bricklayer's Arms, has since been closed and turned into housing.
* In the Usborne Puzzle Adventure ''The Vanishing Village'', the protagonists must find help an 18th century village that's stuck in limbo. The only way they can get into the past is to bring something that originated in the village with them from the present day. It's a spoon, weirdly enough.
* In the ''Literature/{{Bolo}}'' story "The Night of the Trolls" by Creator/KeithLaumer, the protagonist comes out of a long stretch as a HumanPopsicle to find that society has collapsed. The first friendly person he meets in the new world is an old man who turns out to be his son, aged considerably in the 80 or so years since the protagonist's stasis began.
* The old Hermit in ''Literature/ACanticleForLeibowitz'', though his immortality is never explained.
** Most commentators agree that the final section of the book pretty much comes out and says that he's the [[FlyingDutchman Wandering Jew]].
* [[InvertedTrope Inverted]] in the Literature/{{Discworld}} book ''Discworld/NightWatch''. Sam Vimes ends up in the past after a magical accident, and has to keep things on-track while a criminal who went with him is messing everything up. Right when he's most despairing of ever getting back to where he belongs, [[spoiler: a History Monk brings him his silver cigar case, a gift from the wife he doesn't have yet and a reminder that his 'future' is real and has already happened.]]
** On the other hand, many of the important cast members' past selves feature in the story: Fred Colon, M(r)s. Palm, Young Vimes, [[spoiler: Vetinari]]...
* From ''InTheKeepOfTime'', Smailholm Tower. In an unusual variation, it is ''also'' the "time machine", as it were. The interesting implication of this is that the key can only take time travelers to a time period where the tower exists, not before its construction or after it collapses.
* In Creator/NealStephenson's ''Literature/{{Cryptonomicon}}'', we are treated to three separate stories: two during World War II, and one in the modern day. Many of the characters from the modern day are descendants of the characters from World War II. But apart from the younger Waterhouse's stories of his grandfather, there's only one man who appears in both timelines: Enoch Root, who hasn't aged a day. In ''Literature/TheBaroqueCycle'', we meet the far more distant ancestors of the protagonists of ''Cryptonomicon'', as the book is set in the 17th century. But even all this way out, there's still one character in common: Enoch Root.
* OlderThanRadio: After sleeping for 20 years, RipVanWinkle is dismissed as just a loony old man until he is recognized by his daughter, now grown with a family of her own.
* In TheRedemptionOfAlthalus, when the title character first goes to the House At the End of the World, he passes a particular dead tree, when he leaves the House, 2500 years later, the same dead tree is still there, The Goddess Dweia says the gods keep the tree around as a landmark.
* Used as a plot point in one ''Literature/{{Animorphs}}'' book, where the kids manage to use a vision of a BadFuture shown to them by the Ellimist to find out the location of the Yeerk Pool. In the vision (where they see what their city would look like in the aftermath of a full-scale Yeerk takeover) they notice that there's just one building in their city left standing, and they realize that the Yeerk Pool's exterior is the one building that the Yeerks wouldn't bomb if they ever launched a full-on attack.
* Creator/JRRTolkien's Literature/MiddleEarth:
** Elrond Half-Elven serves as the Constant for the stories, born in the last days of the First Age in ''TheSilmarillion'' and being a character in ''Literature/TheHobbit'' and ''Literature/TheLordOfTheRings''. Technically, Galadriel was around for longer, but Elrond appeared in more works.
** Círdan the Shipwright is one in-universe. He has been around in so long (tens of thousands of years, making him the oldest known elf still there at the time of LOTR) that he is the only elf ever mentioned that has managed to ''grow an actual long grey beard.'' And he (or one of his two ports) is at the very least mentioned in almost every major work to do with Middle-earth.
[[/folder]]

[[folder: Live Action TV]]
* In ''Series/AshesToAshes'' [[spoiler:which does not involve Time Travel]] Gene Hunt is Alex's constant because he was present in Sam Tyler's world in ''Series/{{Life On Mars|2006}}''. This is of great importance to Alex as it could mean that she is inhabiting the same world as Sam Tyler, Thus disproving her original theory that she was in a coma. [[spoiler:In the end, it is revealed that Alex is in purgatory.]]
** This fact is highlighted in 2×08 of Ashes to Ashes:
--> ''Martin Summers'': "Look at us. Couple of desperate cases. Now you've lost your lifeline..."
--> ''Alex'': *Mumbling in her sleep* "No."
--> ''Martin Summers'': "...Your constant. Your Gene Hunt."
** This is explained in the series finale when it is discovered that Gene Hunt [[spoiler: "created" the Universe/Purgatory after his death and "modelled" it to his own liking.]]
** Ray and Chris are also constants in both series, however Gene Hunt is the main constant to all characters because [[spoiler: he is revealed to be a psychopomp for dead police officers.]]
** Nelson the Bartender from ''Series/{{Life On Mars|2006}}'' also appears at the end of ''Series/AshesToAshes'' becuase [[spoiler: he is a holy power and is accepting Alex, Shaz, Chris and Ray into heaven.]]
** A few minor characters (notably DCI Litton) from ''Series/{{Life On Mars|2006}}'' appear in ''Series/AshesToAshes'' but because Alex never read of these characters [[ItMakesSenseInContext from Sam Tyler's Notes]], she can not ascertain if they are constants or figments. This is only revealed in the series finale.
*** It's all very Solipsistic!
* Happens from time to time in ''Series/DoctorWho'' due to its time-travel nature. A significant example comes during the last episode of the new Series 5, [[spoiler: where events are put into place that makes Amy Pond the constant for the entire universe.]]
** Captain Jack Harkness has also become ''the'' constant for the universe. [[CompleteImmortality He can never die. He can never stop existing.]] [[spoiler: And now, [[Series/TorchwoodMiracleDay Rex Matheson]] seems to have joined him]].
** In the old series, there was only one actor who crossed the tenures of more than two doctors. TheBrigadier. Even TheMaster and Davros changed actors. But Nicholas Courtney was there as Brigadier Alistair Gordon Lethbridge-Stewart from the second doctor, to the seventh, making his final appearance in the Sarah Jane Adventures. Companions changed, and the Doctor regenerated, but the Brigadier stood there throughout it all, always taking TheSlowPath, and always ready to [[CrowningMomentOfAwesome do the best he can.]]
*** And that's what makes it so [[TearJerker heartbreaking]] when you find out he has died by the time of the Eleventh Doctor.
** In the DoctorWhoExpandedUniverse (or at least the AudioPlay/BigFinishDoctorWho audios and short story collections), there's the White Rabbit pub, on the Embankment. When the Fifth Doctor met Creator/WilliamShakespeare it was where Globe patrons went after a show. When the Second Doctor was arrested for celebrating Christmas during the [[OliverCromwell Cromwell Protectorate]], the landlord rescued him. The Doctor's long-term friend Edward Grainger (1906-2006) lived nearby and occasionally frequented it, and was his granddaughter's [[MyLocal local]] in the 1990s. It was also UNIT's local in the 2000s. In 2021, it was where Hex Schofield had a birthday party just before becoming the Seventh Doctor's companion. It even still exists in [[BerniceSummerfield the 26th century]], although for some reason it's been relocated to the planet Bedrock 12. At one point, the Doctor is touching the bar when Linda Grainger points out it's "the same pub", and gets a psychic shockwave of all the memories attached to it.
** The Doctor himself becomes this for [[spoiler:Clara Oswald]], as revealed in [[Recap/DoctorWhoS33E13TheNameOfTheDoctor the series 7 finale]].
--->Sometimes it's like I've lived a thousand lives in a thousand places. I'm born. I live. I die. And always there's the Doctor.
* The TropeNamer is an episode of ''Series/{{Lost}}'' ("The Constant") in which Desmond is undergoing rapid MentalTimeTravel between two times in his life and must find a Constant in the two times in order to avoid insanity and death. It's [[spoiler:his girlfriend Penelope]].
** On the same show, Daniel Faraday uses [[spoiler:Desmond]] as his Constant.
* Although there's no TimeTravel involved, [=McCoy=] appears in "Encounter at Farpoint", the first episode of ''Series/StarTrekTheNextGeneration'', as a reminder that the two series take place in [[TheVerse the same universe]] but different times.
** The same idea occurs with all the other series of ''Franchise/StarTrek'' as well, with a character from a preceding series showing up in the first episode of the new series (Picard in ''[[Series/StarTrekDeepSpaceNine Deep Space Nine]]'', Quark in ''[[Series/StarTrekVoyager Voyager]]'', Spock (and a reference to an Admiral Archer) in [[Film/StarTrek the reboot]]. ''[[Series/StarTrekEnterprise Enterprise]]'', due to taking place earliest in the continuity, used Zefram Cochrane from ''Film/StarTrekFirstContact''.
** In the two-part ''[[Series/StarTrekTheNextGeneration Next Generation]]'' episode "Time's Arrow", the long-lived Guinan is the link between times (along with Data's severed head).
** The ''Next Generation'' two-parter "Unification", created for an anniversary and featuring Spock, who is used to link the past and the present. Spock (specifically, Leonard Nimoy as Spock) is arguably this for the franchise as a whole, since he also appears in the 2009 reboot movie, where he actually serves to make it clear that the reboot is taking place in a ''different'' timeline, which is nevertheless at least related to the TOS one.
** The Guardian of Forever in the original series episode "The City on the Edge of Forever" claims to be this for almost all sentient history. "Since before your sun burned hot in space, I have awaited a question."
[[/folder]]

[[folder: Video Games]]
* Leene's Bell in ''VideoGame/ChronoTrigger'' and the Black Omen, later in the game (but previously chronologically). Also the Sun Cave, the Nu and, of course, Lavos.
* In ''VideoGame/DarkCloud 2'', there is almost always an overly obvious Constant: That baby [[{{Pokemon}} Lapras]]-looking thing you saved helped to form the labs! That girl was the sage all along! etc.
* The video game series ''LegacyOfKain'' has the nine Pillars of Nosgoth, while they don't remain in a constant state (the ruination of the pillars is a major plot point) they remain as a constant on the landscape of the environment and a general marker for the time period. Along with the Pillars, Ariel's soul is present in every game but ''Blood Omen 2'', and her state (bound to the Pillars) ''is'' constant, a reminder of Kain's decision not to sacrifice himself.
* The ruined tower in Sheratan in ''VideoGame/BatenKaitos Origins'' serves as a constant for Sagi, who can eventually use it to travel back and forth in time [[spoiler:due to housing a spirit who was alive back then]].
* Happens several times to the immortal Kaim, in ''LostOdyssey''. A couple of incidents in the 'Dreams of a Thousand Years' section involve him meeting someone as a child, then crossing their paths again, 60, 70 or 80 years later, where they're old and dying, and he's still as young as ever. In the main game story, he also meets a wise old king - whom, as it turns out, he first met when he was a brash young prince, and taught a few things about combat, survival, and life in general.
* In ''VideoGame/DayOfTheTentacle'', the same house exists for over 400 years, from the days of the FoundingFathers to the future where the tentacles have taken over the world, although it's much more metallic in the future. Also, many objects in the house can be found in more than one time period. This is often used by the main characters to affect one or more future time periods. For example, since only inanimate objects can be passed through the [[OurTimeMachinesAreDifferent Chron-O-John]], the only way to send a hamster to Laverne in the future is to put it in the [[HumanPopsicle freezer]], which is still around 200 years from now. Apparently, no one has bothered to look inside in all this time. The time machine is still in the basement in the future (though it's broken and useless), and the laundry room doesn't change in the slightest - the coin-operated dryer Bernard sets running in the present is still going two hundred years later (he fed it a ''lot'' of change).
* ''VideoGame/TheLegendOfZeldaOcarinaOfTime'' and ''VideoGame/{{The Legend Of Zelda Oracle|Games}} of Ages'' play with this trope a lot. It's possible the Deku tree is an example across the games, if the one in ''VideoGame/TheLegendOfZeldaTheWindWaker'' is the same one in ''Ocarina''. (More likely, it's the tree that grew out of the Deku Sprout, since the old one died.)
* Across both wildly divergent timelines in the ''VideoGame/CommandAndConquer'' series, ''[[CommandAndConquerTiberium Tiberium]]'' and ''[[CommandAndConquerRedAlert Red Alert]]'', there is a corporation called Futuretech.
* In the ''{{Franchise/Bioshock}}'' series, [[spoiler: there is always a man, a lighthouse, and a city, no matter what universe.]]
* In ''VideoGame/MassEffect2'', the Illusive Man invokes this trope to give the newly BackFromTheDead Shepard a personal incentive to help Cerberus take down the Collectors, by having a larger and more advanced replica of the original ''Normandy'' built, convincing Joker and Dr Chakwas to join her crew and sending Shepard to recruit some of their former squadmates for the mission. In doing so, he's able to keep Shepard's mind focused on the mission and not on the two years that have passed while they were clinically dead.
* The intro to ''VideoGame/StarOceanTillTheEndOfTime'' has a few, including the (pictured) Statue of Liberty.

[[/folder]]

[[folder: Western Animation]]
* King Bumi from ''WesternAnimation/AvatarTheLastAirbender''. Aang knew him as a kid, got frozen in ice for 100 years, and then meets up with Bumi again as an old, crazy king. An episode is resolved by the revelation of this Constant.
** Katara acts as this in ''WesternAnimation/TheLegendOfKorra'' particularly for the audience. She's the only member of the original cast that we see until the 9th episode (save statues, of course).
* Similar to ''Avatar'' but across a much longer time period, there is an episode of ''SamuraiJack'' where Jack visits a temple he had been to in the past. Not only do the martial artist students practice the same traditions, but there is even a monk there, thousands and thousands of years old, that Jack met when he was there.
** And when Jack [[CrowningMomentOfHeartwarming finally finds]] [[TearJerker his homeland.]]
* ''WesternAnimation/{{Futurama}}'' has several Constants: the subterranean ruins of New York, the pizzeria where Fry used to work, the various [[PeopleJars heads of celebrities preserved in jars]], and so on. The biggest one is probably [[spoiler:Nibbler, who was responsible for Fry being frozen a thousand years earlier]]. And Fry's dog...who we'll skip over before we start to [[TearJerker tear up]].
** Applied Cryogenics somehow manages to survive for 1000 years without a power failure (or apocalyptic destruction), despite the "No Power Failures Since 1997" sign on the wall in the pilot episode, and that we see the world reduced to medieval levels twice during that time.
*** Fry froze in 1999.
** There's a ShoutOut to ThePlanetOfTheApes in an episode where Fry, Bender, and the Professor travel forward in time to the year 10000. Fry, walking through the ruins of the city of New New York, sees a tilted, half-buried Statue of Liberty and laments "They blew it up! (pan to an identical statue of a gorilla) ... and then the apes blew up their society too!" (pan to another statue with a bird's head) "And then birds took over and ruined ''their'' society!" (pan to yet another statue) "And then cows ..." (pan again) "and ... I don't know ... is that a slug maybe? [[BigNo NOOOOOO!]]"
* In the ''WesternAnimation/JusticeLeague'' episode "Hereafter", Superman is hurled forward some 30,000 years. He soon finds the immortal Vandal Savage as the sole survivor of the human race...who also happens to be responsible for the extinction of the rest of it. Savage feels understandably guilty about the whole thing, and sends Supes back to stop his past self.
** There is also the Watchtower which, in a subtle ChekhovsGun, has [[ColonyDrop survived reentry]] to crashland in the jungle.
* Demona in ''WesternAnimation/{{Gargoyles}}''.
[[/folder]]

[[folder: Webcomics]]
* ''{{Narbonic}}'' has one where Dave has to find a Constant, so he can get returned to the present. [[spoiler: Getting slapped/punched by a girl works!]]
* In ''{{Homestuck}}'', [[spoiler: Dad is pretty much the same guy in both the original universe and the post-Scratch universe.]]
** As well, Caliborn's home [[spoiler: is the troll's meteor and his planet is Earth, ''littered'' with Statues of Liberties.]]
* Jones (aka Wandering Eye) is a constant in ''GunnerkriggCourt''. In the flashbacks where the parents of the main protagonists are shown in their school days, Jones is there, appearing exactly as she does in the present. This (along with the inhuman speed and strength Jones had already demonstrated) led to fan speculation that Jones was a particularly humanoid robot, which author Tom Siddell shot down in comments without revealing any more than that. [[spoiler: When Antimony finally gets the story out of her, it turns out that Jones has been around literally since the Earth was formed. Even she doesn't know what she really is.]]
[[/folder]]

[[folder: Web Original]]
* In ''DarwinsSoldiers: Pavlov's Checkmate'', the main team is trapped in 1990, and needs to send a message to a teammate still in 2010. They do this by noticing a file cabinet that they recall seeing in 2010, and slipping a note inside it.
* In ''FineStructure'', Anne Poole is the Constant for over 20,000 years.
[[/folder]]

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