History StableTimeLoop / WesternAnimation

* ''WesternAnimation/StarWarsRebels'': In [[Recap/StarWarsRebelsS4E11AWorldBetweenWorlds "A World Between Worlds"]], [[spoiler:Ezra enters the titular EldritchLocation, which is a PlaceBeyondTime containing portals through which all of space and time can be reached. He comes across a portal leading to the planet Malachor, during the events of [[Recap/StarWarsRebelsS2E19TwilightOfTheApprentice "Twilight of]] [[Recap/StarWarsRebelsS2E20TwilightOfTheApprenticePartII the Apprentice"]], two years prior InUniverse, and sees the tail end of Ahsoka Tano's duel with Darth Vader, which she is losing. Just as she shatters the floor, causing Vader to fall through it, Ezra reaches through the portal and pulls her through just before the Malachor Sith temple explodes. This explains the mention that Vader assumed her dead in [[Recap/StarWarsRebelsStepsIntoShadow "Steps Into Shadow"]] — since she was in a place that Vader didn't even know existed, he couldn't sense her. By the end of the episode, instead of coming with Ezra to Lothal, Ahsoka goes back through the Malachor portal after they are attacked by the Emperor through a different portal, returning after she left. Her appearance in the epilogue of "Twilight of the Apprentice" is shown again, revealing that she went deeper into the ruins in an attempt to find a portal into the world between worlds so she could see Ezra again. It's also implied by the reveal in [[Recap/StarWarsRebelsS4E13FamilyReunionAndFarewell "Family Reunion]] [[Recap/StarWarsRebelsS4E14FamilyReunionAndFarewellPartII — and Farewell"]] that she survived to Ezra's time, two years later, that she stayed away from the Rebels for all that time because she knew that if the events in Ezra's life after Malachor that led to him entering the world between worlds didn't happen the same way, he wouldn't be able to save her life.]]

* In ''WesternAnimation/{{Futurama}}'''s episode "Roswell That Ends Well," Farnsworth is very adamant about not changing the past, unless of course it turns out they were ''supposed'' to change the past, in which case, they must, for the love of God, [[ConfusingMultipleNegatives not not change it.]] Fry ends up killing his grandfather Enos by mistake, after an attempt to keep him safe. He impregnates his grandmother, thus becoming his own grandfather, which becomes ChekhovsGun. After that, Farnsworth gives up about not changing the past. The crew blasts up Roswell Air Force Base, steals some gear, rescues Zoidberg and Bender's body, and blasts off into space. Farnsworth then delivers one of the best lines ever: "Choke on ''that'', causality!" Oh yeah, and throughout all this, the crew ends up being the mysterious alien ship that crashed in Roswell, and Zoidberg is the alien.

*** Also, in the movie, their main method of time travel is stated to be a self correcting method. Thusly, any copies made using the time travel are doomed to die horribly at some point. Some last longer than others. Farnsworth and Nibbler state that there can't be any paradoxes, and if there are, [[spoiler: such as by the end of the movie where it's revealed there's hundreds of Benders (all of whom one Bender foolishly tells to stay underground until that moment, thus completely screwing up the timeline of the whole movie and creating hundreds of paradoxes)]], it rips open a hole in the universe, [[spoiler: which is exactly what happens, leading to the events of the second movie.]]
* In the ''[[WesternAnimation/TheFantasticFour1967 Fantastic Four]]'' episode "Rama-Tut," the heroes go back in time to ancient Egypt after finding an Egyptian tablet that seems to depict a man with a condition similar to the Thing's returning to normal. It turns out that the man in the tablet is the Thing himself, who briefly regains his human form after being enslaved by Rama-Tut.
* In an episode of ''WesternAnimation/MaryShelleysFrankenhole'' [[spoiler: Film/TheWolfman1941 is bitten by a seemingly unknown werewolf and his girlfriend tries in vain to kill him with regular bullets before shooting herself. Decades later (after Dr. Frankenstein tries in vain to stop his immortality as a werewolf), he travels through a Frankenhole portal to the past and attempts to give his beloved a silver bullet loaded gun... before turning into the werewolf that bit him in the first place. Plus, the gun he tried to give her is the same one that she ended up killing herself with.]]

* The ''WesternAnimation/StarTrekTheAnimatedSeries'' episode "Yesteryear" has Kirk and Spock return from a trip to the past to find that the ship suddenly has a different science officer, and no one else knows who Spock is. Spock relates a memory from his childhood when his life was saved by an adult Vulcan, who he realizes looked exactly like he does now. So he has to take one more trip to the past to save himself and set things right.
** In a very odd scene, the alternate-history science officer, an Andorian, is informed by Spock that Spock's plan, if successful, will mean the Andorian will no longer be the science officer for the Enterprise -- and may in fact ''cease to exist entirely.'' The Andorian accepts this notion with an almost eerie calm, and wishes Spock the best of luck on his quest.

** Mojo Jojo goes back in time to try to kill Professor Utonium as a young boy to prevent him from creating the Powerpuff Girls. The girls follow and save TheProfessor, and it was this very incident that inspired him to get into science and try to create "the perfect little girl."

* ''WesternAnimation/TheFairlyOddParents'' full-episode special "The Secret Origin of Denzel Crocker": Timmy goes back in time to figure out why Crocker is so miserable. He discovers that Crocker had fairy godparents as a kid, and not just any random fairies, either--Cosmo and Wanda were his fairies. Since present-day Cosmo and Wanda had no memory of this, they quickly figure that Crocker had done something to lose his fairies. They then set out to try to stop this, but Timmy ends up being the one revealing Crocker's secret in public. Worse still, he leaves A.J.'s "Crocker-tracker" in the past, which Crocker managed to reconfigure with Cosmo's DNA, making it a much more effective "Fairy-Finder" than the one present-day Crocker previously had.
** ...which actually proves to be only a semi-stable time loop. If it were a ''true'' stable time loop, Crocker would have had AJ's tracker the entire time. Either that, or he 'forgot' that he had it until immediately after Timmy gets back from his time-travel.
** This loop actually has a logical beginning. Past Cosmo is about to reveal Crocker's secret to a large crowd, but then Timmy stops him, only to accidentally reveal the secret himself when present Cosmo wondered "[[WhatDoesThisButtonDo What does this switch do?]]". Less of a time loop, more of Timmy kicking the can a few seconds forward and becoming the cause himself. This means with or without Timmy's intervention, either Cosmo is going to mess something up.
*** And the reason Cosmo and Wanda didn't remember having Crocker as a godchild? The past Cosmo was playing with the device Jorgen Von Strangle used to erase young Crocker's memories of having fairies (the device being a reference to ''Film/MenInBlack'') and accidentally erased his and Wanda's memories of having Crocker as godchild.
** This has actually happened a few times. Timmy helped the boy who would grow up to be his father win a trophy he used in turn to propose to the girl who would grow up to be his mother in the episode "Father Time". In "Timmy Turnip" he helped his grandparents escape their native country to come to America. Both of those were necessary to restore the Status Quo. In "The Past & the Furious" we see he had a hand in the invention of the wheel and the sandwich, plus the founding of his favorite restaurant chain.
** In "Which Witch is Witch?" Timmy goes back in time to do research on the founding of Dimmsdale, where he discovered it was going to be named Bitterburg after notorious witch hunter Alden Bitterroot, an ancestor of Crocker, and that Dale Dimm, who Dimmsdale was ultimately named after, was an oafish ManChild. It was Timmy who exposed Bitterroot as a witch himself and got Dimm to beat him to death. Also, the town would have been named Daleburg had Timmy not come up with the name Dimmsdale.
* ''WesternAnimation/TheTransformers'' featured a truly epic multi-layer time loop revealed over the course of several episodes. 11 million years ago, A3 led a [[TurnedAgainstTheirMasters revolt against the Quintessons]]; however, in 2006, the Quintessons yanked A3 into their own time to prevent themselves from losing Cybertron. Blaster, Perceptor, Blurr, and Wreck-Gar go back in time to help the rebellion, while the Aerialbots save A3 from the Quintessons. A3 returns to his own time to lead the rebellion. Two million years later, A3, now known as Alpha Trion, meets the Aerialbots, who have travelled back in time from 1986. The Aerialbots persuade him to save the life of a young dock worker named Orion Pax, who he rebuilds into Optimus Prime (and also rebuilds Orion's girlfriend Ariel into [[{{Fembot}} Elita One]]). The Aerialbots return to their own time and then, in 1984, Optimus Prime and Alpha Trion build the Aerialbots from a group of shuttles. You may wish to draw a diagram.
* In the ''WesternAnimation/PinkyAndTheBrain'' episode "Brain of the Future," the two mice travel to the distant future in a time machine given to them by their future selves, who had just returned from the distant future. There, they lose the time machine they arrived in but manage to steal a "different" one and return to give it to their past selves...
* ''WesternAnimation/KimPossible: A Sitch in Time'' has this. Shego stole the time monkey only because she stole it, went back in time, transferred Ron away from Kim, and then told herself to steal the time monkey. This somewhat changes when the time monkey is destroyed and the entire timeline that its use created is revoked, [[RetGone along with the very existence of the time monkey]]. So, you destroy it once, it erases itself from ever existing. So Shego never went back in time, Ron never left KP, and nobody ever knew or cared about the time monkey.
** And within that wheel, Shego takes the monkey while in the past and escapes into the timestream, so Kim goes straight from the past to face Shego in the BadFuture. Shego manages to TakeOverTheWorld partly because Kim wasn't around to stop her, since she skipped over that whole time.
** On the other hand, the [[RetGone self-destruction of the time monkey]] is only implied; if its destruction doesn't affect its past existence, then the movie becomes a case of the TimeyWimeyBall.
* ''WesternAnimation/DextersLaboratory''
** The movie "Ego Trip" starts with robots appearing in the lab, looking for "the one who saved the future" and Dexter [[ItsAllAboutMe assumes they came to kill him]]. Inspired by this, Dexter hops in his time machine and ends up going on an adventure with [[MyFutureSelfAndMe three future versions of himself]], battling four Mandarks. In the end, the day is saved when Dee Dee walks in and [[WhatDoesThisButtonDo does her thing]]. Furious at being upstaged, the four Dexters build some robots and send them to beat up "the one who saved the future". When he realizes this, Dexter's reaction is to give up on explaining time travel and then going to eat lunch.

* ''WesternAnimation/ThePenguinsOfMadagascar'' episode "[[ExactlyWhatItSaysOnTheTin It's About Time]]" involves a time-traveling Kowalski trying to SetRightWhatOnceWentWrong while avoiding a {{temporal paradox}}... and a ''second'' Kowalski trying to avoid ''another'' temporal paradox. HilarityEnsues.
* The intro short for ''WesternAnimation/TheSimpsons'' theme park ride has this. Professor Frink learns that [[Ride/BackToTheFutureTheRide Doc Brown's Future Technology Institute]] was bought out by Krusty the Klown and closed down, and uses the [=DeLorean=] to go back in time and prevent this. When he arrives, Frink accidentally runs down the investor to whom Doc was speaking, forcing him to sell the Institute to "that mercenary clown".

** ''WesternAnimation/TeenageMutantNinjaTurtles2003'', notably in "Timing is Everything," in which the events of this episode are heavily implied to be the reason why the Shredder became so ruthless in his hunt for the turtles during the "The Shredder Strikes Back" two-parter. The Shredder that appeared in "Timing Is Everything" was right after the events of "The Shredder Strikes, Part Two" (as in, right after he broke out of the wreckage of the water tower that fell on him), and learned of his eventual defeat at their hands. Thus, he resolved to ensure it never happened, resulting in the events of the follow three or so seasons -- [[YouCantFightFate making his defeat inevitable]].

* An episode of ''WesternAnimation/FamilyGuy'' explicitly pointed out the trope when Stewie and Brian accidentally caused the Big Bang due to time travel.
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode "[[Recap/MyLittlePonyFriendshipIsMagicS2E20ItsAboutTime It's About Time]]", Twilight Sparkle comes across her (lightly injured) future self, who came from next Tuesday morning to give her a very serious message, but Twilight keeps interrupting her future self, until she gets sent back to the future before she could finish her warning. Present Twilight spends the next several days worrying about averting impending doom and getting more and more injured because of random events, matching up her future self's injuries [[spoiler: until next Tuesday morning comes, and absolutely nothing bad happens,]] which is when Twilight decides to use a special magic scroll to go back in time and warn her past self [[spoiler: that nothing bad was going to happen]] and [[spoiler: she had no reason at all to worry about. Unfortunately, her past self kept interrupting her until the time travel spell wears out and Twilight returns to the future- which is now her present. Then she realizes what she has done: her half-done attempt to warn her past self about not worrying is what made her worry in the first place and created a stable time loop. After a few moments, she decides to shrug it off and declares it her past self's problem now.]]
** To add to this, Future Twilight tells her past self where to find the time spell.
* In one episode of ''[[WesternAnimation/JusticeLeague Justice League: Unlimited]]'', Braniac 5 summons Franchise/GreenLantern, Comicbook/GreenArrow, and Comicbook/{{Supergirl}} to the 31st century to help in a conflict as history records show that the three time-traveled once- but Supergirl didn't return, implying that she died. At the end [[spoiler: [[ProphecyTwist Supergirl doesn't die, but she enjoys 31st century-Earth more like the advanced society she grew up in, as well as developed a crush on Brainiac 5, that she decides to stay voluntarily.]]]]
** In another episode, Batman reprograms the villain's time belt to stick him in one of these; his StartOfDarkness, in which his shrewish wife berates him over and over and over, into infinity.
* ''WesternAnimation/GravityFalls'' episode "The Time Traveler's Pig" combines this with SelfFulfillingProphecy and YouAlreadyChangedThePast. Time traveler Blendin Blandin comes to the present from the year Twenty-Sñevety-Twelve to prevent series of time-anomalies from occurring. [[spoiler: It turns out that the anomalies were caused by Dipper and Mabel messing around with Blendin's time traveling device, dropping several items around past episodes, and Blendin is sent to retrieve the litter- explaining why Blendin popped up in those episodes as a FreezeFrameBonus.]]
* The Israeli satire series ''Animation/MK22'' featured an episode in which the resident BigBad, a Bedouin who is secretly a terrorist, [[MakeWrongWhatOnceWentRight goes back in time to try and drive the Jews away from Palestine and prevent the establishment of the State of Israel in several different points in time]]: he tries to kill [[Literature/TheBible Moses]] [[TheresNoKillLikeOverkill with a bazooka]], King David (before his coronation, during his fight with Goliath) with a rifle, and King Solomon with a thrown axe, and to convince Theodor Herzl not to found a Jewish state. All of his attempts [[NiceJobFixingItVillain have the opposite outcome]], accidentally causing one of these: the bazooka hits the rock in the desert that produces water for the people[[note]]The story of Moses hitting the rock to produce water is much more famous among Jews; in the original story, however, Moses hit the rock in frustration instead of asking it to produce water, as God told him, a sin for which God [[DisproportionateRetribution told him he would not be allowed into the Holy Land]], which he has been wandering towards for ''forty years'', but this is naturally glossed over for the sake of RuleOfFunny.[[/note]], making Moses, who was planning to flee with his brother, a hero; the bullet hits Goliath instead of David; the axe cuts the baby from the JudgmentOfSolomon in half, portraying the inattentive King Solomon as a hero; and Herzl had never thought about founding a Jewish state beforehand.
* In ''WesternAnimation/RegularShow'' episode "Prank Callers", while being chased by the Master Prank Caller in the 80s, the gang ended up accidentally running over Pops, turning him into the ditz he is in the present.
** It gets weirder since Pops was the one who gave Mordecai and Rigby the 80's cell phones that brought them back in time, and Pops gave them the phones while he was falling for a prank call Mordecai and Rigby pulled on him. (They asked him to wait for a collect call from Joe Momma. And he did.)
* In ''WesternAnimation/AdventureTime'' episode "Betty", [[spoiler:Simon]] created a portal to the past so that he can say goodbye to [[spoiler:his former girlfriend Betty]] and to gain her forgiveness. This was because he believed that [[spoiler:she fled him in terror, after he did something unpleasant to her in his madness after putting on the crown that turned him into Ice King]]. On seeing him, she jumps into the portal to permanently enter the show's present, explaining why she disappeared.

* In the final episode of ''WesternAnimation/Ben10Omniverse'', [[spoiler:the villain Maltruant is revealed to be stuck in one, something that he is ''completely unaware of''. He reassembles himself, sets out to remake the universe in his image by going to before time has started and the current universe has yet to be created, only to be defeated and destroyed by Ben. Then Professor Paradox hides the pieces of him across the universe, and the cycle of reassembly and defeat starts all over again.]]
* ''WesternAnimation/MiloMurphysLaw'':
** In "Missing Milo", at one point, Milo, Dakota, and Cavendish are running through the ruined future city, but would have run into [[ItMakesSenseInContext a small horde of pistachio-monsters]] had they not been stopped by a peach being thrown at them, which Dakota then pockets. They later escape the Pistachions by [[TimeTravel traveling back ten minutes]], only to see themselves about to walk right into that very Pistachion squad. Thinking quickly, Dakota hands Cavendish the peach, which he then throws at their past selves, who pocket it and later travel back to throw it at themselves, ''ad infinitum''. [[https://www.youtube.com/watch?v=-Y8MezTFX0s Cavendish is confounded by this.]]
** Meanwhile, in the present, Sara, Melissa, and Zack are looking for Milo, and the Murphy family dog Diogee finds him…in a LostEpisode of their favorite TV show, ''Dr. Zone''. They go to meet with the show's [=creator/star=] Orton Mahlson, who gives them [[WriteBackToTheFuture a letter Milo gave him over 50 years ago.]] At the end of the episode, Milo learns of the letter, but realizes he hasn't been on that adventure yet. Rather than having to write the note later, he simply tucks it away in [[BagOfHolding his backpack]] to give to Orton Mahlson in 1965.

** The Game actually had [[spoiler:the entire plot, which was a giant ShootTheShaggyDog story about trying to prevent Mom from conquering the world by buying Planet Express, and dying while failing to do anything other than set up a seemingly random joke at the start]].

* ''WesternAnimation/TeenageMutantNinjaTurtles2003'', notably in "Timing is Everything," in which the events of this episode are heavily implied to be the reason why the Shredder became so ruthless in his hunt for the turtles during the "The Shredder Strikes Back" two-parter. The Shredder that appeared in "Timing Is Everything" was right after the events of "The Shredder Strikes, Part Two" (as in, right after he broke out of the wreckage of the water tower that fell on him), and learned of his eventual defeat at their hands. Thus, he resolved to ensure it never happened, resulting in the events of the follow three or so seasons -- [[YouCantFightFate making his defeat inevitable]].

* The Israeli satire series ''M.K. 22'' featured an episode in which the resident BigBad, a Bedouin who is secretly a terrorist, [[MakeWrongWhatOnceWentRight goes back in time to try and drive the Jews away from Palestine and prevent the establishment of the State of Israel in several different points in time]]: he tries to kill [[Literature/TheBible Moses]] [[TheresNoKillLikeOverkill with a bazooka]], King David (before his coronation, during his fight with Goliath) with a rifle, and King Solomon with a thrown axe, and to convince Theodor Herzl not to found a Jewish state. All of his attempts [[NiceJobFixingItVillain have the opposite outcome]], accidentally causing one of these: the bazooka hits the rock in the desert that produces water for the people[[note]]The story of Moses hitting the rock to produce water is much more famous among Jews; in the original story, however, Moses hit the rock in frustration instead of asking it to produce water, as God told him, a sin for which God [[DisproportionateRetribution told him he would not be allowed into the Holy Land]], which he has been wandering towards for ''forty years'', but this is naturally glossed over for the sake of RuleOfFunny.[[/note]], making Moses, who was planning to flee with his brother, a hero; the bullet hits Goliath instead of David; the axe cuts the baby from the JudgmentOfSolomon in half, portraying the inattentive King Solomon as a hero; and Herzl had never thought about founding a Jewish state beforehand.

* The first season finale of ''WesternAnimation/MiloMurphysLaw'' features this twice:
** At one point, Milo, Dakota, and Cavendish are running through the ruined future city, but would have run into [[ItMakesSenseInContext a small horde of pistachio-monsters]] had they not been stopped by a peach being thrown at them, which Dakota then pockets. They later escape the Pistachions by [[TimeTravel traveling back ten minutes]], only to see themselves about to walk right into the Pistachion squad! Thinking quickly, Dakota hands Cavendish the peach, which he then throws at their past selves, who pocket it and later travel back to throw it at themselves, ''ad infinitum''.

** In "Which Witch is Witch?" Timmy goes back in time to do research on the founding of Dimmsdale, where he discovered it was going to be named Bitterburg after notorious witch hunter Alden Bitterroot, an ancestor of Crocker, and that Dale Dimm, who Dimmsdale was ultimately named after, was an oafish ManChild. It was Timmy who exposed Bitterroot as a witch himself and got Dimm to beat him to death. Also, the town would have been named Dalesburg had Timmy not come up with the name Dimmsdale.

** MagnificentBastard David Xanatos uses this to his advantage in "Vows". When pulled to 975 AD, he gives the Illuminati a coin to hold onto for one thousand years, and then deliver it to a young David Xanatos. The coin wasn't worth much in the past, but by the time it reaches him in 1975, it's worth twenty grand, which is the foundation for his fortune. He also gave them a letter to hold onto for 1,020 years, so he'd get it precisely one week before the episode began, telling [[WriteBackToTheFuture himself exactly what to do.]] He uses this as proof to his [[WellDoneSonGuy father]] that he's a SelfMadeMan after-all. Dad's not impressed. He makes a direct LampshadeHanging of the trope when Goliath arrives to rescue him.

* In ''WesternAnimation/{{Futurama}}'''s episode "Roswell That Ends Well," Farnsworth is very adamant about not changing the past, unless of course it turns out they were supposed to change the past, in which case, they must, for the love of God, [[ConfusingMultipleNegatives not not change it.]] Fry ends up killing his grandfather Enos by mistake, after an attempt to keep him safe. He impregnates his grandmother, thus becoming his own grandfather, which becomes ChekhovsGun. After that, Farnsworth gives up about not changing the past. The crew blasts up Roswell Air Force Base, steals some gear, rescues Zoidberg and Bender's body, and blasts off into space. Farnsworth then delivers one of the best lines ever: "Choke on ''that'', causality!" Oh yeah, and throughout all this, the crew ends up being the mysterious alien ship that crashed in Roswell, and Zoidberg is the alien.

** Meanwhile, in the present, Sara, Melissa, and Zack are looking for Milo, and the Murphy family dog Diogee finds him…in a LostEpisode of their favorite tv show, ''Dr Zone''. They go to meet with the show's [=creator/star=] Orton Mahlson, who gives them [[WriteBackToTheFuture a letter Milo gave him over 50 years ago.]] At the end of the episode, Milo learns of the letter, but realizes he hasn't been on that adventure yet. Rather than having to write the note later, he simply tucks it away in [[BagOfHolding his backpack]] to give to Orton Mahlson in 1965.

** Meanwhile, in the present, Sara, Melissa, and Zack are looking for Milo, and the Murphy family dog Diogee finds him…in a LostEpisode of their favorite tv show, ''Dr Zone''. They go to meet with the show's [=creator/star=] Orton Mahlson, who gives them a letter Milo gave him over 50 years ago. At the end of the episode, Milo learns of the letter, but realizes he hasn't been on that adventure yet. Rather than having to write the note later, he simply tucks it away in [[BagOfHolding his backpack]] to give to Orton Mahlson in 1965.

* In the ''[[WesternAnimation/TheFantasticFour1967 Fantastic Four]]'' episode "Rama-Tut," the heroes go back in time to ancient Egypt after finding an Egyptian tablet that seems to depict a man with a condition similar to the Thing's returning to normal. It turns out that the man in the tablet is the Thing himself, who briefly returns to his human form after being enslaved by Rama-Tut.

* In the ''[[WesternAnimation/TheFantasticFour1967 Fantastic Four]]'' episode "Rama-Tut," the heroes go back in time to ancient Egypt after finding an Egyptian tablet that seems to depict a man with a condition similar to the Thing's returning to normal. It turns out that the man in the tablet is Ben himself, who briefly returns to his human form after being enslaved by Rama-Tut.

** MagnificentBastard David Xanatos uses this to his advantage in "Vows". When pulled to 975 AD, he gives the Illuminati a coin to hold onto for one thousand years, and then deliver it to a young David Xanatos. The coin wasn't worth much in the past, but by the time it reaches him in 1975, it's worth twenty grand, which is the foundation for his fortune. He also gave them a letter to hold onto for 1,020 years, so he'd get it precisely one week before the episode began, telling [[WriteBackToTheFuture himself exactly what to do.]] He makes a direct LampshadeHanging of the trope when Goliath arrives to rescue him.

* In ''WesternAnimation/AdventureTime'' episode "Betty", [[spoiler:Simon]] created a portal to the past so that he can say goodbye to [[spoiler:Betty]] and to gain her forgiveness. This is because he believed [[spoiler:she left him after putting on the crown that led him to become the Ice King]]. She then jumps on the portal, explaining her disappearance as years go by.

** This loop actually has a logical beginning. Past Cosmo is about to reveal Crocker's secret to a large crowd, but then Timmy stops him, only to accidentally reveal the secret himself when present Cosmo wondered "[[WhatDoesThisButtonDo What does this switch do?]]". Less of a time loop, more of Timmy kicking the can a few seconds forward and becoming the cause himself.

** This has actually happened a few times. Timmy helped the boy who would grow up to be his father win a trophy he used in turn to propose to the girl who would grow up to be his mother in the episode "Father Time". In "Timmy Turnip" he helped his grandparents escape their native country to come to America. In "The Past & the Furious" we see he had a hand in the invention of the wheel and the sandwich, plus the founding of his favorite restaurant chain.

* In the final episode of ''WesternAnimation/Ben10Omniverse'', [[spoiler:the villain Maltruant is revealed to be stuck in one, something that he is ''completely unaware of''. He reassembles himself, sets out to remake the universe in his image by going to before time has started and the current universe has yet to be created, only to be defeated and destroyed by Ben. Then Professor Paradox hides the pieces of him across the universe, and the cycle starts all over again.]]

** This loop actually has a logical beginning. Cosmo is about to reveal Crocker's secret to a large crowd, but then Timmy stops him, only to reveal the secret himself. Less of a time loop, more of Timmy kicking the can a few seconds forward and becoming the cause himself.

*** There is a hint that either Demona's own nature was going to lead her down that path no matter what anyone tried to get her to change it, or events can be changed to some extent, with fate forcing them back on course. The scene in which Demona gives Goliath half of the Phoenix Gate is shown twice; once in Goliath's memories, once after their attempts to change time. If you're observant, you'll notice that the scene is in two different locations.
** The episode "M.I.A." hints at what could be a possible out within one: [[spoiler:Goliath travels back to UsefulNotes/WorldWarII London to investigate an accusation that he caused the death of a gargoyle back then. When it seems that the Gargoyle in question really is marked for death by fate, Goliath takes him to the present day with him, saving his life, but still preserving the effects of his death]]. Or fate could just have been screwing with him to achieve the predestined result.

*** In the same scenes, Demona did attempt to change history, but was not surprised when it didn't work, because she still remembered what had happened to her past self that night. Future/Present Demona was the one that brought them all to the past in that episode, and then she goes to her younger self. She travels 20 years into the then-future, to 995 AD, and Goliath catches a ride. She shows herself the slaughter of Wyvern castle, and then tells herself to get rid of all the humans. Initially her past self rejects this, and she fights herself. She seems to take to heart what future Goliath tells her as she is returned to 975. However, by the time those twenty years pass, she makes a plan to do exactly what her future self told her to do, eliminate all the humans from the castle. This causes the scene her future self used to scare her in the first place, resulting in the classic irony this trope generally causes.

*** In the same scenes, Demona always knew history is immutable because she already saw it. Future/Present Demona was the one that brought them all to the past in that episode, and then she goes to her younger self. She travels 20 years into the then-future, to 995 AD, and Goliath catches a ride. She shows herself the slaughter of Wyvern castle, that all her rookery mates are dead, and then tells herself to get rid of all the humans. Initially her past self rejects this, and she fights herself. She at first seems to reject what her future self told her, and embrace what future Goliath told her as she is returned to 975. However, by the time those twenty years pass, she makes a plan to do exactly what her future self told her to do, eliminate all the humans from the castle. This causes the scene her future self used to scare her in the first place, resulting in the classic irony this trope generally causes. Future Demona wasn't actually trying to change it though, as she remembered what happened to her past self that night, and knew what would happen, it was all a trick to turn herself evil and turn her into the person she becomes.

** The first episode had Dexter and Dee Dee attacked by a giant blob monster from a wormhole. Dexter gives Dee Dee a message warning him about the monster. She then uses it as an opportunity to blackmail an originally reluctant past iteration of Dexter (who is wrapped up in working on an invention). This annoys Dexter to the point where he tries to send Dee Dee into an untested wormhole that spews the monster. Dexter then repeats the previous events and tries to give Dee Dee the message, but Dee Dee then finally gives him the message he had wanted all along, thus sealing his fate. It is also revealed that the invention Dexter was working on was that very wormhole that sealed his fate.

*** Note that this ends up clashing with the previous bullet as, before being kicked forwards in time again, Fry says he needs a better escape craft when he redoes the mission in the future and the Nibblonians provide it. This means Fry doesn't get trapped in the Infosphere and thus the events that allowed him to have the better escape craft never happen.

* ''WesternAnimation/GravityFalls'' episode "The Time Traveler's Pig" combines this with SelfFulfillingProphecy and YouAlreadyChangedThePast. Time traveler Blendin Blandin comes to the present from the year Twenty-Snevety-Twelve to prevent series of time-anomalies from occurring. [[spoiler: It turns out that the anomalies were caused by Dipper and Mabel messing around with Blendin's time traveling device, dropping several items around past episodes, and Blendin is sent to retrieve the litter- explaining why Blendin popped up in those episodes as a FreezeFrameBonus.]]

--->'''Goliath''': If I didn't fear the damage you'd do to the timestream, I'd leave you here.\\

*** Xanatos is the only person who really ends up benefiting from the Phoenix Gate - everyone else is worse off for having used it, with the Phoenix Gate not infrequently leading people to their own doom.
** Goliath found out that history is immutable to his dismay in the same episode. He tried to convince teen Demona not to turn evil. It worked, but only temporarily.

** The episode "M.I.A." hints at what could be a possible out within one: [[spoiler: Goliath travels back to UsefulNotes/WorldWarII London to investigate an accusation that he caused the death of a gargoyle back then. When it seems that the Gargoyle in question really is marked for death by fate, Goliath takes him to the present day with him, saving his life, but still preserving the effects of his death]]. Or fate could just have been screwing with him to achieve the predestined result.