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** Very explicitly played straight in "[[Recap/BuffyTheVampireSlayerS5E3TheReplacement The Replacement]]" (season 5): Xander has been split into two halves by a demon's spell, and Willow explains that there's not much to rejoining them -- their natural state is to be together and the spell is doing the work of keeping them apart, so all she has to do is end it.
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** Very explicitly played straight in "[[Recap/BuffyTheVampireSlayerS5E3TheReplacement The Replacement]]" (season 5): Xander has been split into two halves by a demon's spell, and Willow explains that there's not much to rejoining them -- their natural state is to be together and the spell is doing the work of keeping them apart, so all she has to do is end it. By saying, "Let the spell be ended."
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** In the episode "Heart," whether or not werewolves are subject to ontological inertia is actually a central plot point. [[spoiler:Sam and Dean haven't seen a werewolf "since [they] were kids" (and presumably didn't actually participate in that hunt). Their father had a theory that if the werewolf who bit and turned another was killed, said other werewolf would turn back to a normal human. They test said theory. It doesn't work.]]
** In "Two Minutes to Midnight", Pestilence's mere presence infects the Winchesters with so many diseases they can't even stand. When he loses his RingOfPower, they're back on their feet in seconds.
** The same effect appears with [[TheGrimReaper Death's]] ring in the same episode. Chicago is being pummeled by a massive storm, which Bobby estimated would kill 3 million people. As soon as Dean has Death's ring in hand, however, the weather dies down and everything is fine.
** Similar case with the NighInvulnerable [[spoiler: Leviathans.]] They don't die, however with their leader [[spoiler: Dick Roman]] dead they have become "normal" monsters albeit extremely hard to kill. At least according to Crowley.
** In "Two Minutes to Midnight", Pestilence's mere presence infects the Winchesters with so many diseases they can't even stand. When he loses his RingOfPower, they're back on their feet in seconds.
** The same effect appears with [[TheGrimReaper Death's]] ring in the same episode. Chicago is being pummeled by a massive storm, which Bobby estimated would kill 3 million people. As soon as Dean has Death's ring in hand, however, the weather dies down and everything is fine.
** Similar case with the NighInvulnerable [[spoiler: Leviathans.]] They don't die, however with their leader [[spoiler: Dick Roman]] dead they have become "normal" monsters albeit extremely hard to kill. At least according to Crowley.
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** In the episode "Heart," "[[Recap/SupernaturalS02E17Heart Heart]]", whether or not werewolves are subject to ontological inertia is actually a central plot point. [[spoiler:Sam and Dean haven't seen a werewolf "since [they] were kids" (and presumably didn't actually participate in that hunt). Their father had a theory that if the werewolf who bit and turned another was killed, said other werewolf would turn back to a normal human. They test said theory. It doesn't work.]]
** In"Two "[[Recap/SupernaturalS05E21TwoMinutesToMidnight Two Minutes to Midnight", Midnight]]", Pestilence's mere presence infects the Winchesters with so many diseases they can't even stand. When he loses his RingOfPower, they're back on their feet in seconds.
** The same effect appears with [[TheGrimReaperDeath's]] Death]]'s ring in the same episode. Chicago is being pummeled by a massive storm, which Bobby estimated would kill 3 million people. As soon as Dean has Death's ring in hand, however, the weather dies down and everything is fine.
** Similar case with theNighInvulnerable [[spoiler: Leviathans.]] {{Nigh Invulnerab|ility}}le [[spoiler:Leviathans]]. They don't die, however die; however, with their leader [[spoiler: Dick [[spoiler:Dick Roman]] dead dead, they have become "normal" monsters monsters, albeit extremely hard to kill. At kill (at least according to Crowley.Crowley).
** In
** The same effect appears with [[TheGrimReaper
** Similar case with the
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* ''Series/StarTrekTheOriginalSeries'' episode "The Deadly Years". A strange form of radiation causes Kirk, Spock, [=McCoy=] and Scotty to age at a rate of 10 years per day until they're all senior citizens. Once a medicine that neutralizes the radiation's effect is administered, they quickly de-age back to their original ages.
** In “Miri” [=McCoy=] becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
* Averted in the ''Series/StarTrekTheNextGeneration'' series finale. Picard (who is moving back and forth through time by Q) is warned by Q that he will be responsible for destroying humanity. In each time frame Picard travels to the Neutral Zone to investigate a "spatial anomaly". Eventually, Picard realizes that the inverse tachyon pulses he is using to scan the anomaly are [[NiceJobBreakingItHero actually creating it]] and will, in the far past, prevent the human race from ever coming into being ([[FromBadToWorse and all other life on earth, apparently]]). Turning off the beams does nothing, however, and Picard bemuses "Why isn't the anomaly being affected?" Turns out the anomaly does have ontological inertia, and the Enterprise has to find a way to repair it.
* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed) as well as the nature of the destruction; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.
** In “Miri” [=McCoy=] becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
* Averted in the ''Series/StarTrekTheNextGeneration'' series finale. Picard (who is moving back and forth through time by Q) is warned by Q that he will be responsible for destroying humanity. In each time frame Picard travels to the Neutral Zone to investigate a "spatial anomaly". Eventually, Picard realizes that the inverse tachyon pulses he is using to scan the anomaly are [[NiceJobBreakingItHero actually creating it]] and will, in the far past, prevent the human race from ever coming into being ([[FromBadToWorse and all other life on earth, apparently]]). Turning off the beams does nothing, however, and Picard bemuses "Why isn't the anomaly being affected?" Turns out the anomaly does have ontological inertia, and the Enterprise has to find a way to repair it.
* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed) as well as the nature of the destruction; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.
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* ''Series/StarTrekTheOriginalSeries'' episode "The ''Series/StarTrekTheOriginalSeries'':
** In "[[Recap/StarTrekS1E8Miri Miri]]", [=McCoy=] becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
** In "[[Recap/StarTrekS2E12TheDeadlyYears The DeadlyYears". A Years]]", a strange form of radiation causes Kirk, Spock, [=McCoy=] and Scotty to age at a rate of 10 years per day until they're all senior citizens. Once a medicine that neutralizes the radiation's effect is administered, they quickly de-age back to their original ages.
** In “Miri” [=McCoy=] becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
* Averted in the ''Series/StarTrekTheNextGeneration'' series finale.finale "[[Recap/StarTrekTheNextGenerationS7E24AllGoodThings All Good Things...]]". Picard (who is moving back and forth through time by Q) is warned by Q that he will be responsible for destroying humanity. In each time frame Picard travels to the Neutral Zone to investigate a "spatial anomaly". Eventually, Picard realizes that the inverse tachyon pulses he is using to scan the anomaly are [[NiceJobBreakingItHero actually creating it]] and will, in the far past, prevent the human race from ever coming into being ([[FromBadToWorse and all other life on earth, apparently]]). Turning off the beams does nothing, however, and Picard bemuses "Why isn't the anomaly being affected?" Turns out the anomaly does have ontological inertia, and the Enterprise ''Enterprise'' has to find a way to repair it.
* In ''Series/StarTrekVoyager'''s two-part episode"Year "[[Recap/StarTrekVoyagerS4E8YearOfHell Year of Hell", Hell]]", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed) as well as the nature of the destruction; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.
** In "[[Recap/StarTrekS1E8Miri Miri]]", [=McCoy=] becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
** In "[[Recap/StarTrekS2E12TheDeadlyYears The Deadly
* In ''Series/StarTrekVoyager'''s two-part episode
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* ''[[Series/WonderWoman1975 Wonder Woman]]'': In "Fausta, the Nazi Wonder Woman", Major Steve Trevor is faced with utterly damning evidence of being a traitor. Once Wonder Woman punches out the bad guys, all of the evidence still exists, but is ignored. In "Judgment from Outer Space", the world is visited by a confirmed alien who demonstrates his powers and meets with world leaders such as President Roosevelt. But once Wonder Woman beats up a few Nazis and rescues everyone from their clutches, the very existence of extraterrestrial life drops out of everyone's sight.
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** ''Series/KamenRiderSaber'': Averted once more with the BigBad. Once Storious uses his finishing move, [[ExactlyWhatItSaysOnTheTin The End of the World]], the world is over regardless of whether the heroes defeat him or not.
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* ''Series/{{House}}'' is a regular offender. However, depending on the dramatic level of the episode, they might avert this.
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** Played straight in [[Film/StarTrekInsurrection Insurrection]] with Geordi La Forge's eyes being regenerated to normal functioning eyes, only to become blind again after the effect had caused it had worn off, as if healthy eyes require some kind of constant external effect to remain healthy and functional.
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed) as well as the nature of the destruction; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed) as well as the nature of the destruction; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* ''Series/KamenRiderDenO'' has an interesting dual case of this. Similar to the other kids show example above, when monsters go back in time to wreak havoc and the title character defeats them, any changes they've made to the timeline are reversed... almost. ''Human beings'' have no ontological inertia, since their existence is dependent on memories others have of them. So if someone is killed in the past, but everyone that knew them in the present loses their memories of them at the same time, that person won't come back to life, and will be forced to wander the timestream. This leads to a very glaring plot hole later in the series. Ryotaro isn't worried when [[spoiler:Yuuto is killed in the past, erasing his future self]] because by killing the MonsterOfTheWeek, all the damage is restored. Unfortunately, [[spoiler:Yuuto doesn't return because "Ryotaro never knew Yuuto at that age".]] All well and good, until it gets revealed that [[spoiler:Airi and Sakurai's plan to hide their child hinged on Ryotaro's memory: basically, the ''entire'' timeline would be reconstructed from his memory, sans the baby which was erased from his memories by the Zeronos Cards. What about all the other people that Ryotaro had never met?]]
* Averted in ''Series/KamenRiderDouble'''s portion of the {{Crossover}} ''Movie Wars CORE'': the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
* Averted in ''Series/KamenRiderGaim'': When Roshuo (the king of the [[MonsterOfTheWeek Inves]]) is killed, it does absolutely nothing to stop the spread of the [[AlienKudzu Forest of Helheim]] or the other Inves attacking; the only way to permanently end the threat is for someone to take Roshuo's place as the master of Helheim, abandoning their humanity in the process.
** Which turns out to not be a breach of the rule: it was ''thought'' that the Overlords were the {{Big Bad}}s sending the Helheim Forest into our world, but in fact, the forest [[spoiler: has a will of its own, personified in a guy we'd thought was a normal human, and has its own ideas as to why its spread is necessary. Roshuo's the top monster in ''his'' world, having claimed the key to some control of the forest, but he's far from the "master" of the series' events.]]
* Averted in ''Series/KamenRiderDouble'''s portion of the {{Crossover}} ''Movie Wars CORE'': the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
* Averted in ''Series/KamenRiderGaim'': When Roshuo (the king of the [[MonsterOfTheWeek Inves]]) is killed, it does absolutely nothing to stop the spread of the [[AlienKudzu Forest of Helheim]] or the other Inves attacking; the only way to permanently end the threat is for someone to take Roshuo's place as the master of Helheim, abandoning their humanity in the process.
** Which turns out to not be a breach of the rule: it was ''thought'' that the Overlords were the {{Big Bad}}s sending the Helheim Forest into our world, but in fact, the forest [[spoiler: has a will of its own, personified in a guy we'd thought was a normal human, and has its own ideas as to why its spread is necessary. Roshuo's the top monster in ''his'' world, having claimed the key to some control of the forest, but he's far from the "master" of the series' events.]]
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* ''Franchise/KamenRider'':
** Averted in ''Series/KamenRiderKuuga''. The Grongi lack the more supernatural powers of many other monsters in favor of being a race of serial killers, and as such their victims aren't spared by their defeat.
** ''Series/KamenRiderDenO'' has an interestingdual case of this. Similar to the other kids show example above, when this. When monsters go back in time to wreak havoc and the title character defeats them, any changes they've made to the timeline are reversed... almost. ''Human beings'' have no ontological inertia, since their existence is dependent reversed based on people's memories others have of them. So if someone is killed the correct version of history. This generally means that as long as one person survived in the past, but everyone that knew them in the present loses their memories of them at other people will revive those people, who will revive the same time, that people they knew, and so on. However, in some rare cases, a person won't come back doesn't ''have'' anyone to life, remember them, and will instead be forced to wander the timestream. timestream. This leads to a very glaring plot hole later in the series. Ryotaro isn't worried when [[spoiler:Yuuto is killed in the past, erasing his future self]] because by killing the MonsterOfTheWeek, all the damage is restored. Unfortunately, [[spoiler:Yuuto doesn't return because "Ryotaro never knew Yuuto at that age".]] All well and good, until it gets revealed that [[spoiler:Airi and Sakurai's plan to hide their child hinged on Ryotaro's memory: basically, the ''entire'' timeline would be reconstructed from his memory, sans the baby which was erased from his memories by makes the Zeronos Cards. What about all belt extremely dangerous to use, because it erases a random person's memories of the other people that Ryotaro had never met?]]
*user as the price every time they transform, making their existence more and more fragile.
** Averted in ''Series/KamenRiderDouble'''s portion of the {{Crossover}} ''Movie Wars CORE'': the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
* ** Averted in ''Series/KamenRiderGaim'': When Roshuo (the king No amount of killing the monsters that come out of the [[MonsterOfTheWeek Inves]]) is killed, it does absolutely nothing to stop the spread of the [[AlienKudzu Forest of Helheim]] or the other Inves attacking; the only way to permanently end the threat is for someone to take Roshuo's place as the master of Helheim, abandoning their humanity in the process.
** Which turns out to not be a breach of the rule: it was ''thought'' that the Overlords were the {{Big Bad}}s sending theHelheim Forest into our world, but in fact, the forest [[spoiler: has a will of its own, personified in a guy we'd thought was a normal human, and has its own ideas as to why its stop the AlienKudzu that they spawn from, nor stop the infection that they spread is necessary. Roshuo's the top monster to people they injure.
** Played with in''his'' world, having claimed the key ''Series/KamenRiderBuild'' when BigBad Evolt infects Sento with a lethal alien venom, prompting Banjo to some control of the forest, try and defeat him in hopes that it will cure Sento. After he wins, Sento's infection doesn't stop, but he's far from the "master" of the series' events.]]Evolt cures him on a whim.
** Averted in ''Series/KamenRiderKuuga''. The Grongi lack the more supernatural powers of many other monsters in favor of being a race of serial killers, and as such their victims aren't spared by their defeat.
** ''Series/KamenRiderDenO'' has an interesting
*
** Averted in ''Series/KamenRiderDouble'''s portion of the {{Crossover}} ''Movie Wars CORE'': the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
** Which turns out to not be a breach of the rule: it was ''thought'' that the Overlords were the {{Big Bad}}s sending the
** Played with in
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed); when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eradicating them at that point in time, but literally rewriting the entirety of history so that whatever it is never existed); existed) as well as the nature of the destruction; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eliminating them in the moment, but literally rewriting the entirety of history so that whatever it is never existed); when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (i.e. not just eliminating eradicating them at that point in the moment, time, but literally rewriting the entirety of history so that whatever it is never existed); when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (literally rewriting history so that whatever it is never existed); when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history (literally (i.e. not just eliminating them in the moment, but literally rewriting the entirety of history so that whatever it is never existed); when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history; when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because of the whole nature of the situation, which involves a device that can erase items from history; history (literally rewriting history so that whatever it is never existed); when the ship is destroyed, the time-changing device backfires on itself and erases ''itself'' from history, so everything the device had done is undone because said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because it's not just the destruction of the ship restoring everything, but rather that when the ship was destroyed, the time-changing weapon backfired on itself and erased ''itself'' from history, so everything the weapon had done was undone because the weapon never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because it's not just the destruction of the ship restoring everything, but rather whole nature of the situation, which involves a device that can erase items from history; when the ship was is destroyed, the time-changing weapon backfired device backfires on itself and erased erases ''itself'' from history, so everything the weapon device had done was is undone because the weapon said device never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because it's not just the destruction of the ship restoring history, but rather that the time-changing weapon backfired on itself and erased itself from history so everything the weapon had done was undone because the weapon never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also reverses all of the changes it made to the timeline. {{Justified|Trope}} because it's not just the destruction of the ship restoring history, everything, but rather that when the ship was destroyed, the time-changing weapon backfired on itself and erased itself ''itself'' from history history, so everything the weapon had done was undone because the weapon never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline. {{Justified|Trope}} since it's specifically explained that when the ship blew up, the time-changing weapon imploded and erased ''itself'' from history, so all of the rest of history was changed to what it would have been had the weapon never existed.[[note]]However, this still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes reverses all of the changes it made to the timeline. {{Justified|Trope}} since because it's specifically explained that when not just the destruction of the ship blew up, restoring history, but rather that the time-changing weapon imploded backfired on itself and erased ''itself'' itself from history, so all of the rest of history so everything the weapon had done was changed to what it would have been had undone because the weapon never existed.[[note]]However, this conclusion still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline. {{Justified|Trope}} since it's specifically explained that when the ship blew up, the time-changing weapon imploded and erased ''itself'' from the timeline, causing all of history to be changed to what it would have been had the weapon never existed.[[note]]However, this still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline. {{Justified|Trope}} since it's specifically explained that when the ship blew up, the time-changing weapon imploded and erased ''itself'' from history, so all of the timeline, causing all rest of history to be was changed to what it would have been had the weapon never existed.[[note]]However, this still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline. {{Justified|Trope}} since it's specifically explained that when the ship blew up, the time-changing weapon imploded and erased ''itself'' from the timeline, meaning that anything that had been done with the weapon never happened.[[note]]However, this still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline. {{Justified|Trope}} since it's specifically explained that when the ship blew up, the time-changing weapon imploded and erased ''itself'' from the timeline, meaning that anything that had causing all of history to be changed to what it would have been done with had the weapon never happened.existed.[[note]]However, this still contributes to the reason why ''Voyager'' earned itself the FanNickname ''U.S.S. ResetButton''.[[/note]]
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline.
** While the above is Justified in the show[[note]]destroying the time ship caused it to erase ''itself'' from history, retroactively undoing all of its actions[[/note]], ''Voyager'' earned itself the nickname ''U.S.S. ResetButton'' for a combination of this and StatusQuoIsGod.
** While the above is Justified in the show[[note]]destroying the time ship caused it to erase ''itself'' from history, retroactively undoing all of its actions[[/note]], ''Voyager'' earned itself the nickname ''U.S.S. ResetButton'' for a combination of this and StatusQuoIsGod.
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* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline.
** Whiletimeline. {{Justified|Trope}} since it's specifically explained that when the above is Justified in the show[[note]]destroying the time ship caused it to erase blew up, the time-changing weapon imploded and erased ''itself'' from history, retroactively undoing all of its actions[[/note]], the timeline, meaning that anything that had been done with the weapon never happened.[[note]]However, this still contributes to the reason why ''Voyager'' earned itself the nickname FanNickname ''U.S.S. ResetButton'' for a combination of this and StatusQuoIsGod.ResetButton''.[[/note]]
** While
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Night King, not 'Winter King'. Seriously, who would even make that mistake?
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* In ''Series/GameOfThrones'' all the Winter King's zombies disappear when Arya kills him. Apparently winter stops coming, too.
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* In ''Series/GameOfThrones'' all the Winter Night King's zombies disappear when Arya kills him. Apparently winter stops coming, too.
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** In “The Deadly Years” McCoy becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
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** In “The Deadly Years” McCoy “Miri” [=McCoy=] becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
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** in “The Deadly Years” McCoy becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
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** in In “The Deadly Years” McCoy becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
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** in “The Deadly Years” McCoy becomes infected with a virus that covers his face in large lesions. Within seconds of injecting himself with a potential cure, the lesions begin to disappear as if by magic, instead of healing naturally over several days or weeks.
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* In ''Series/GameOfThrones'' all the Winter King's zombies disappear when Arya kills him. Apparently winter stops coming, too.
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* In ''Series/GameOfThrones'' all the Winter King's zombies disappear when Arya kills him. Apparently winter stops coming, too.
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* In ''Series/GameOfThrones'' all the Winter King's zombies disappear when Arya kills him. Apparently winter stops coming, too.
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* In Lupinranger vs. Patranger, one of the main villains is Zamigo Delma, who gave different loved ones of the Lupinrangers the freeze ‘n’ shatter treatment. They hope that this will turn out to be true, that Zamigo’s victims will restored if they can take him down. Later, it turns out that he didn’t shatter them - he can teleport those he’s iced, and the ice shell is all that actually breaks. We find out later still that the human disguises the monsters use were created from actual humans - acquiring them being Zamigo’s job. Just how it’s done is a mystery even to the monsters themselves, but everyone’s pretty sure that’s not good for the original humans. Anyway, Zamigo’s death does return the victims (reappearing in their ice coverings, which shatter, freeing them) even though all he did was move them and whatever happens to make disguises from them is not carried out by Zamigo himself. It’s like if you caught a bus somewhere last year, and the driver died today, and because of that, you were suddenly teleported to the place where he’d picked you up (along with the long-since-destroyed bus, which exists again just long enough to spit you out to the same spot on the street.)
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* In ''Series/TheVampireDiaries'', when an Original Vampire is killed, all vampires created from their bloodline also die.
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* In ''Series/TheVampireDiaries'', when ''Series/TheVampireDiaries'':
** When an Original Vampire is killed, all vampires created from their bloodline alsodie.die. The SpinOff ''Series/TheOriginals'' reveals that this is by design, to make sure that regular vampires can't betray their creators.
** The fifth season introduces a spell that removes all magic within a certain area. This includes the magic that keeps vampires alive, so any vampire that steps within the zone will start to succumb to whatever killed them as a human. For example, [[spoiler:Tyler's neck breaks, Elena and Caroline (drowned and suffocated, respectively) start to choke and Stefan and Damon's gunshot wounds reappear.]]
** When an Original Vampire is killed, all vampires created from their bloodline also
** The fifth season introduces a spell that removes all magic within a certain area. This includes the magic that keeps vampires alive, so any vampire that steps within the zone will start to succumb to whatever killed them as a human. For example, [[spoiler:Tyler's neck breaks, Elena and Caroline (drowned and suffocated, respectively) start to choke and Stefan and Damon's gunshot wounds reappear.]]
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*In Lupinranger vs. Patranger, one of the main villains is Zamigo Delma, who gave different loved ones of the Lupinrangers the freeze ‘n’ shatter treatment. They hope that this will turn out to be true, that Zamigo’s victims will restored if they can take him down. Later, it turns out that he didn’t shatter them - he can teleport those he’s iced, and the ice shell is all that actually breaks. We find out later still that the human disguises the monsters use were created from actual humans - acquiring them being Zamigo’s job. Just how it’s done is a mystery even to the monsters themselves, but everyone’s pretty sure that’s not good for the original humans. Anyway, Zamigo’s death does return the victims (reappearing in their ice coverings, which shatter, freeing them) even though all he did was move them and whatever happens to make disguises from them is not carried out by Zamigo himself. It’s like if you caught a bus somewhere last year, and the driver died today, and because of that, you were suddenly teleported to the place where he’d picked you up (along with the long-since-destroyed bus, which exists again just long enough to spit you out to the same spot on the street.)
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%%* ''Series/{{Charmed}}'' was very bad, and inconsistent about this.
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%%* ''Series/{{Charmed}}'' ''Series/{{Charmed|1998}}'' was very bad, and inconsistent about this.
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* ''[[Series/WonderWoman1975 Wonder Woman]]'': In "Fausta, the Nazi Wonder Woman", Major Steve Trevor is faced with utterly damning evidence of being a traitor. Once Wonder Woman punches out the bad guys, all of the evidence still exists, but is ignored. In "Judgment from Outer Space", the world is visited by a confirmed alien who demonstrates his powers and meets with world leaders such as President Roosevelt. But once Wonder Woman beats up a few Nazis and rescues everyone from their clutches, the very existence of extraterrestrial life drops out of everyone's sight.
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%% This page has been alphabetized. Please add new examples in the correct order.
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Examples of NoOntologicalInertia in live-action TV.
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* ''Series/TwentyFour'': Jack Bauer's [[spoiler: heart problems]] apparently disappeared in between seasons 2 and 3, just in time for him to [[spoiler: develop a heroin addiction and suffer withdrawal]] that could be knocked out with some painkillers. He didn't suffer any permanent damage from the [[spoiler: biological weapon]] from season 7 that we know of.
* In ''Series/AmericanHorrorStoryCoven'', Queenie invokes this trope with Papa Legba. Marie Leveau [[DealWithTheDevil made a deal]] with the loa centuries ago: she would be granted eternal life and youth in exchange for performing a "service" for Legba (usually the [[PoweredByAForsakenChild death of an innocent]]) once a year. Later, Marie bound herself to Madame Delphine [=LaLurie=] with a potion that granted the same effects, then [[BuriedAlive buried her alive]] in an [[AndIMustScream airtight coffin, wrapped in chains and gagged, unable to move or call for help — ever]]. After Delphine is freed and various plots are [[XanatosSpeedChess laid and relaid]], [=LaLurie=] gains the upper hand and chops Marie into pieces, scattering her about New Orleans for revenge. Queenie, who has a personal vendetta against Delphine, wants Papa Legba to take away her immortality so she can kill her, but he explains that since Marie tied herself to [=LaLurie-=], he can't do anything to either because of the aforementioned bargain. Queenie then argues that, since Marie has been dismembered, she won't be able to perform her annual service in the future, which means the contract is [[MetaphoricallyTrue technically already nullified]]. Legba compliments her for this solution — "You are one ''crafty'' witch" — and instantly negates the deals, making both women vulnerable again and eventually spiriting them off to Hell for eternal punishment.
* Lampshaded in ''Series/{{Angel}}'' Season Four, when the evil Angelus kills the Beast, then complains when the Beast's blotting out of the sun is immediately reversed (as Angel had imagined in a dream-sequence episode).
-->'''Angelus:''' Aw, crap! You mean killing the Beast really does bring back the sun? I thought that was Angel's retarded fantasy.
* Averted and lampshaded in ''Series/TheAquabatsSuperShow'' episode "The Floating Eye of Death!". The titular eye turns several people into zombies, and Jimmy the Robot is actually rather surprised when they don't go back to normal after he destroys it.
* Averted in ''Series/BigWolfOnCampus'' when a medusa turns Merton to stone. The medusa is defeated, but Merton can't be changed back without Tommy and Lori going through an arduous process to obtain a special potion. Also, defeating the evil librarian (don't ask) doesn't save the people trapped in her books. [[spoiler:Reading the books does, though.]]
* In ''Series/BuffyTheVampireSlayer:''
** Averted in "[[Recap/BuffyTheVampireSlayerS1E6ThePack The Pack]]" (Season 1), though the applicability of the trope is arguable. Xander pretends that he doesn't remember any of his actions after the [[spoiler: hyena]] spirt leaves him (but he really does remember). If memories are ''erased'', that can be this trope. If the possessee was never conscious of the events in the first place, then it's not this trope.
** In "[[Recap/BuffyTheVampireSlayerS1E12ProphecyGirl Prophecy Girl]]" (season 1 finale), the Hellmouth re-closes for no particular reason when the Master dies. His death also causes the recently released EldritchAbomination that dwells in the Hellmouth to retreat.
** Played straight in "[[Recap/BuffyTheVampireSlayerS2E8TheDarkAge The Dark Age]]" (season 2). The demon Eyghon possesses [[spoiler: Jenny]], whose appearance gradually becomes demonic. When Eyghon is expelled, she immediately reverts.
** Averted in "[[Recap/BuffyTheVampireSlayerS2E16BewitchedBotheredAndBewildered Bewitched, Bothered, and Bewildered]] " (season 2). Xander misuses a love spell; even after it's undone, the memory of it widens the growing rift between him and Willow (who had unresolved feelings for him already).
** Played straight in "[[Recap/BuffyTheVampireSlayerS3E9TheWish The Wish]]" (season 3). When Giles (in a dystopian alternate timeline) smashes Anyanka's amulet, history is restored. It makes some sense, given that the spell was itself retroactive, but events early in season 7 may still lead one to question the logic.
** {{Subverted}} and {{Parodied}} in season 4's "[[Recap/BuffyTheVampireSlayerS4E4FearItself Fear Itself]]". Parodied EVEN MORE when said Fear Demon, who has an ominous depiction in the book's illustration of him, arrives. [[spoiler: He's literally the size of the drawing, and Buffy just stomps him with her foot.]]
--->'''[[TheMentor Giles]]:''' ''[reading]'' The summoning spell for Gachnar can be shut down in one of two ways. Destroying the Mark of Gachnar...\\
'''[[TheHero Buffy]]:''' ''[destroys the Mark of Gachnar]''\\
'''Giles:''' ''[annoyed]'' ...is ''not'' one of them, and will in fact [[NiceJobBreakingItHero immediately bring forth the Fear Demon, itself]]!
** Very explicitly played straight in "[[Recap/BuffyTheVampireSlayerS5E3TheReplacement The Replacement]]" (season 5): Xander has been split into two halves by a demon's spell, and Willow explains that there's not much to rejoining them -- their natural state is to be together and the spell is doing the work of keeping them apart, so all she has to do is end it.
** Played very straight in "[[Recap/BuffyTheVampireSlayerS7E3SameTimeSamePlace Same Time, Same Place]]" (season 7): to save Dawn from paralytic poison, the team must kill the demon that poisoned her. [[RuleOfFunny She recovers abruptly and funnily]].
%%* ''Series/{{Charmed}}'' was very bad, and inconsistent about this.
* ''Series/DoctorWho:''
** Played straight in [[Recap/DoctorWhoS1E2TheDaleks "The Daleks"]]. The Thals' anti-radiation drugs seem to restore the Doctor and company, who were nearly ''close to death from radiation poisoning'', almost instantly.
** [[Recap/DoctorWhoS4E2TheTenthPlanet "The Tenth Planet"]] ends with the titular planet's destruction sparking the death of all Cybermen on Earth. While it's said they were wholly dependent on power from Mondas, thus explaining why they died alongside it, not only do they drop dead almost instantly, but their organic parts, for almost no reason, disintegrate completely.
** Played straight in [[Recap/DoctorWhoS8E1TerrorOfTheAutons "Terror of the Autons"]], the Master's somewhat inauspicious debut. He awakens a dormant meteorite containing the Nestene Consciousness, which animates a group of Autons (plastic automata) he created, which go on to create second-generation Autons that also come alive with the Nestene Consciousness. When the Autons take care of the first phase of the invasion, the Master uses a radio telescope to broadcast some kind of energy that allows a Nestene mothership to instantly materialize in Earth's sky. When the Doctor reverses the polarity of the telescope, not only does the mothership disappear, but ''every Auton falls lifelessly to the ground''. Justified in that the Autons are not independently intelligent, but are directly controlled by the Nestene Consciousness.
** The ending of [[Recap/DoctorWhoS8E4ColonyInSpace "Colony in Space"]] implies that without the radiation caused by the Doomsday Weapon, the planet will instantly become fertile and provide ample sustenance to the colony who has chosen to continue living there.
** Also played straight in [[Recap/DoctorWhoS28E1NewEarth "New Earth"]]. The Doctor uses a vaccine to cure ArtificialHumans used as lab rats, complete with the visible signs of their illness disappearing before our eyes.
--->'''The Doctor:''' I'm the Doctor, and I ''cured them!''
** [[Recap/DoctorWhoS31E6TheVampiresOfVenice "The Vampires of Venice"]]: When Eleven turns off the generator that begun to give Venice its own natural-disaster apocalypse, including a tidal wave started by an earthquake, within less than a second the sky clears up, the clouds move, and everything is sunshine and rainbows.
** [[Recap/DoctorWhoS32E3TheCurseOfTheBlackSpot "The Curse of the Black Spot"]] features a MonsterOfTheWeek that enters our world using reflective surfaces as a gateway. At one point she does this via a crown; the Doctor responds by tossing said crown into the sea. This somehow causes the monster to vanish. The "monster" was actually a projection from a ship on the other side. Throwing the crown in the water severed the connection.
** [[Recap/DoctorWhoS34E10InTheForestOfTheNight "In the Forest of the Night"]]: After the solar flare, all the trees just melt away into fairy dust.
* ''Series/{{Ghosted}}'': DoubleSubverted in "The Machine". Leroy breaks the [[ImmortalityInducer Cronos machine]], to defeat its indestructible owner but it fails to have any effect. He then destroys the cursed tree powering it, which succeeds in undoing the immortality and turns him to dust.
* ''Series/{{Heroes}}:''
** Adam Monroe (spoilers ahead). [[spoiler:He's over 400 years old, but looks to be in his mid-twenties. However, once Arthur Petrelli steals his healing ability, [[NoImmortalInertia Monroe ages all 400 years, dies, and turns to dust. His youth and health have no ontological inertia.]] This is particularly aggravating in that it makes no sense with the way Monroe's powers work. They don't cover up his age or mask it, he has highly advanced regenerative capabilities. Logically, once he loses his power, he should just be normal, still young, but able to age and be hurt NOW. It's especially glaring with Claire, having the same healing powers, as a main character. When we first met her, her hobby was jumping from heights of several hundred feet just so her twisting her mangled limbs back into place and healing can be filmed, or severing body parts just to watch them grow back. A period of depowerment should mean an instant and gruesome death. Insteead... she's just normal, able to age and be hurt ''now.'']]
*** They try to explain it by claiming that [[spoiler:over the years, Adam has been hurt and killed so many times that his cells now continuously die and regenerate. It's possible that Arthur only took the "regenerate" part away, meaning all the cells in Adam's body instantly died]].
** In the Season 3 finale, Sylar activates Primatech's security system, causing heavy bars to drop over the windows and all the lights to go out. When [[spoiler:he "dies"]], the heavy barriers all rise and the lights turn back on. [[spoiler:The building then explodes, but for unrelated reasons]].
* ''Series/{{House}}'' is a regular offender. However, depending on the dramatic level of the episode, they might avert this.
* ''Series/KamenRiderDenO'' has an interesting dual case of this. Similar to the other kids show example above, when monsters go back in time to wreak havoc and the title character defeats them, any changes they've made to the timeline are reversed... almost. ''Human beings'' have no ontological inertia, since their existence is dependent on memories others have of them. So if someone is killed in the past, but everyone that knew them in the present loses their memories of them at the same time, that person won't come back to life, and will be forced to wander the timestream. This leads to a very glaring plot hole later in the series. Ryotaro isn't worried when [[spoiler:Yuuto is killed in the past, erasing his future self]] because by killing the MonsterOfTheWeek, all the damage is restored. Unfortunately, [[spoiler:Yuuto doesn't return because "Ryotaro never knew Yuuto at that age".]] All well and good, until it gets revealed that [[spoiler:Airi and Sakurai's plan to hide their child hinged on Ryotaro's memory: basically, the ''entire'' timeline would be reconstructed from his memory, sans the baby which was erased from his memories by the Zeronos Cards. What about all the other people that Ryotaro had never met?]]
* Averted in ''Series/KamenRiderDouble'''s portion of the {{Crossover}} ''Movie Wars CORE'': the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
* Averted in ''Series/KamenRiderGaim'': When Roshuo (the king of the [[MonsterOfTheWeek Inves]]) is killed, it does absolutely nothing to stop the spread of the [[AlienKudzu Forest of Helheim]] or the other Inves attacking; the only way to permanently end the threat is for someone to take Roshuo's place as the master of Helheim, abandoning their humanity in the process.
** Which turns out to not be a breach of the rule: it was ''thought'' that the Overlords were the {{Big Bad}}s sending the Helheim Forest into our world, but in fact, the forest [[spoiler: has a will of its own, personified in a guy we'd thought was a normal human, and has its own ideas as to why its spread is necessary. Roshuo's the top monster in ''his'' world, having claimed the key to some control of the forest, but he's far from the "master" of the series' events.]]
* The succubi in ''Series/KrodMandoonAndTheFlamingSwordOfFire'' reproduce by forcing an egg down a man's throat, which then swells in size inside their stomach to give them the "ninth month of pregnancy" look and apparently [[ChestBurster bursts out from their belly]] like in ''Alien''. That is, unless you slay the succubus that laid it, causing an immediate "miscarriage" and the victim vomiting up the remains. This could just be an effect of the Flaming Sword of Fire, as we don't see a succubus being slain with anything else, but it still doesn't make sense either way.
* In ''Series/LostGirl'', The Djieine's venom instantly disappears from its victims' bodies as soon as its heart is destroyed. Lauren starts to give a perfectly rational and sensible explanation (something to do with magnetic fields) for why it stopped instantly, but trails off when she sees that Bo doesn't understand any of it.
* In the ''Series/{{Merlin 1998}}'' series, Queen Mab's spells begin to lose their power and fade away after she disappears. It seems to take at least a few years, though.
* Extremely common in kids' shows, but perhaps best exemplified by ''Franchise/PowerRangers''. In such series, the destruction of a monster almost always reverses whatever effect his power has wrought on the community. In ''Franchise/PowerRangers'', even objects stolen by the villains will also be returned when the MonsterOfTheWeek is slain -- when it wasn't even that monster that took them. The most ridiculous example of this is in one episode of ''[[Series/PowerRangersDinoThunder Dino Thunder]]'' where the ocean-controlling monster has used his powers to summon a tsunami out of the depths, which is about to hit the city. The Rangers destroy the monster just as the wave is about to hit, and the tsunami fades away into nothingness.
** ''Franchise/SuperSentai'' does this as well, with occasional LampshadeHanging.
** Played straight in Series/HikoninSentaiAkibaranger but is usually justified due to the [[MonsterOfTheWeek monsters of the week]] being mere delusions. The battles are simulations the sentai-wannabe "heroes" take part in, all entirely in their heads. When they defeat the monster, they find themselves in reality again, usually wherever they were the first time the monster showed up as they haven't really moved and not much time has really passed. [[spoiler: Until the delusions manage to cross into reality that is...]]
* In Assignment 3 of ''Series/SapphireAndSteel'', the Changeling can reduce things to dust by touching them. When Steel returns him to his original condition, everything he had touched is instantly restored.
* Averted in ''Series/TheSarahJaneAdventures''' "Eye of the Gorgon". Defeating the Gorgon doesn't turn the people it's petrified back. You need to use the talisman, and it only works if they haven't been stone too long.
* ''Series/StarTrekTheOriginalSeries'' episode "The Deadly Years". A strange form of radiation causes Kirk, Spock, [=McCoy=] and Scotty to age at a rate of 10 years per day until they're all senior citizens. Once a medicine that neutralizes the radiation's effect is administered, they quickly de-age back to their original ages.
* Averted in the ''Series/StarTrekTheNextGeneration'' series finale. Picard (who is moving back and forth through time by Q) is warned by Q that he will be responsible for destroying humanity. In each time frame Picard travels to the Neutral Zone to investigate a "spatial anomaly". Eventually, Picard realizes that the inverse tachyon pulses he is using to scan the anomaly are [[NiceJobBreakingItHero actually creating it]] and will, in the far past, prevent the human race from ever coming into being ([[FromBadToWorse and all other life on earth, apparently]]). Turning off the beams does nothing, however, and Picard bemuses "Why isn't the anomaly being affected?" Turns out the anomaly does have ontological inertia, and the Enterprise has to find a way to repair it.
** Played straight in [[Film/StarTrekInsurrection Insurrection]] with Geordi La Forge's eyes being regenerated to normal functioning eyes, only to become blind again after the effect had caused it had worn off, as if healthy eyes require some kind of constant external effect to remain healthy and functional.
* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline.
** While the above is Justified in the show[[note]]destroying the time ship caused it to erase ''itself'' from history, retroactively undoing all of its actions[[/note]], ''Voyager'' earned itself the nickname ''U.S.S. ResetButton'' for a combination of this and StatusQuoIsGod.
* In ''Series/SuperhumanSamuraiSyberSquad'', it's not automatic, but Servo and his accompanying HumongousMecha have a yellow beam to shine on damaged circuitry, reverting anything that's been reprogrammed or ''outright smashed'' to normal. On top of that, sometimes doing so fixes damage to the real world (for example, one MonsterOfTheWeek caused a factory to start putting out toxic gas. Fixing the damage in the Digital World that represents reprogramming some air filters means it doesn't put out any more gas? Understandable. ''This means the gas instantly fades?'' Uh...
* ''Series/{{Supernatural}}:''
** The changelings all asploded when the mother was killed.
** In the episode "Heart," whether or not werewolves are subject to ontological inertia is actually a central plot point. [[spoiler:Sam and Dean haven't seen a werewolf "since [they] were kids" (and presumably didn't actually participate in that hunt). Their father had a theory that if the werewolf who bit and turned another was killed, said other werewolf would turn back to a normal human. They test said theory. It doesn't work.]]
** In "Two Minutes to Midnight", Pestilence's mere presence infects the Winchesters with so many diseases they can't even stand. When he loses his RingOfPower, they're back on their feet in seconds.
** The same effect appears with [[TheGrimReaper Death's]] ring in the same episode. Chicago is being pummeled by a massive storm, which Bobby estimated would kill 3 million people. As soon as Dean has Death's ring in hand, however, the weather dies down and everything is fine.
** Similar case with the NighInvulnerable [[spoiler: Leviathans.]] They don't die, however with their leader [[spoiler: Dick Roman]] dead they have become "normal" monsters albeit extremely hard to kill. At least according to Crowley.
* Played in ''Series/TeenWolf''. Derek said there's a rumor that a turned Beta MAY be able to be cured by killing the Alpha who turned them. However, it doesn't say what happens to any other Beta's the Alpha may have turned, so it would at most be situational, or, it could just be a MotivationalLie Derek told in order to get Scott to cooperate with his plans.
* Played with in ''Series/ToddAndTheBookOfPureEvil''; whether it is played straight or averted seems to depend on the nature of the wish. The general rule seems to be that if the wish creates a separate physical monster, [[OntologicalInertia killing the wisher isn't enough]]. But if the wish is something more abstract or mental (brainwashing, brain-drain, teleporting the main cast, etc.), it will usually revert the moment the wisher dies. Though sometimes there are exceptions where the wish is lifted [[FateWorseThanDeath without the wisher dying]]...
* In ''Series/TheVampireDiaries'', when an Original Vampire is killed, all vampires created from their bloodline also die.
* Used inconsistently in ''Series/Warehouse13'' -- as soon as artifacts get neutralized, all their effects generally go away and people return to normal. There are numerous exceptions, though. Usually caused by a second artifact.
** In one particular case, a highly explosive artifact (a remnant of the London Blitz with all the firepower of the Nazi war machine)) is fueled by hate. They use Gandhi's Shroud to try to remove all negative emotions from the artifact, but the timer is still ticking. They finally realize that they need to use the Shroud on the BigBad, as, apparently, it's his hate that fuels the artifact. Apparently, killing him won't remove the hate. However, as soon as the Shroud is put on him, the timer stops. He apologizes and dies (guess there was nothing left in him but the hate).
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Examples of NoOntologicalInertia in live-action TV.
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* ''Series/TwentyFour'': Jack Bauer's [[spoiler: heart problems]] apparently disappeared in between seasons 2 and 3, just in time for him to [[spoiler: develop a heroin addiction and suffer withdrawal]] that could be knocked out with some painkillers. He didn't suffer any permanent damage from the [[spoiler: biological weapon]] from season 7 that we know of.
* In ''Series/AmericanHorrorStoryCoven'', Queenie invokes this trope with Papa Legba. Marie Leveau [[DealWithTheDevil made a deal]] with the loa centuries ago: she would be granted eternal life and youth in exchange for performing a "service" for Legba (usually the [[PoweredByAForsakenChild death of an innocent]]) once a year. Later, Marie bound herself to Madame Delphine [=LaLurie=] with a potion that granted the same effects, then [[BuriedAlive buried her alive]] in an [[AndIMustScream airtight coffin, wrapped in chains and gagged, unable to move or call for help — ever]]. After Delphine is freed and various plots are [[XanatosSpeedChess laid and relaid]], [=LaLurie=] gains the upper hand and chops Marie into pieces, scattering her about New Orleans for revenge. Queenie, who has a personal vendetta against Delphine, wants Papa Legba to take away her immortality so she can kill her, but he explains that since Marie tied herself to [=LaLurie-=], he can't do anything to either because of the aforementioned bargain. Queenie then argues that, since Marie has been dismembered, she won't be able to perform her annual service in the future, which means the contract is [[MetaphoricallyTrue technically already nullified]]. Legba compliments her for this solution — "You are one ''crafty'' witch" — and instantly negates the deals, making both women vulnerable again and eventually spiriting them off to Hell for eternal punishment.
* Lampshaded in ''Series/{{Angel}}'' Season Four, when the evil Angelus kills the Beast, then complains when the Beast's blotting out of the sun is immediately reversed (as Angel had imagined in a dream-sequence episode).
-->'''Angelus:''' Aw, crap! You mean killing the Beast really does bring back the sun? I thought that was Angel's retarded fantasy.
* Averted and lampshaded in ''Series/TheAquabatsSuperShow'' episode "The Floating Eye of Death!". The titular eye turns several people into zombies, and Jimmy the Robot is actually rather surprised when they don't go back to normal after he destroys it.
* Averted in ''Series/BigWolfOnCampus'' when a medusa turns Merton to stone. The medusa is defeated, but Merton can't be changed back without Tommy and Lori going through an arduous process to obtain a special potion. Also, defeating the evil librarian (don't ask) doesn't save the people trapped in her books. [[spoiler:Reading the books does, though.]]
* In ''Series/BuffyTheVampireSlayer:''
** Averted in "[[Recap/BuffyTheVampireSlayerS1E6ThePack The Pack]]" (Season 1), though the applicability of the trope is arguable. Xander pretends that he doesn't remember any of his actions after the [[spoiler: hyena]] spirt leaves him (but he really does remember). If memories are ''erased'', that can be this trope. If the possessee was never conscious of the events in the first place, then it's not this trope.
** In "[[Recap/BuffyTheVampireSlayerS1E12ProphecyGirl Prophecy Girl]]" (season 1 finale), the Hellmouth re-closes for no particular reason when the Master dies. His death also causes the recently released EldritchAbomination that dwells in the Hellmouth to retreat.
** Played straight in "[[Recap/BuffyTheVampireSlayerS2E8TheDarkAge The Dark Age]]" (season 2). The demon Eyghon possesses [[spoiler: Jenny]], whose appearance gradually becomes demonic. When Eyghon is expelled, she immediately reverts.
** Averted in "[[Recap/BuffyTheVampireSlayerS2E16BewitchedBotheredAndBewildered Bewitched, Bothered, and Bewildered]] " (season 2). Xander misuses a love spell; even after it's undone, the memory of it widens the growing rift between him and Willow (who had unresolved feelings for him already).
** Played straight in "[[Recap/BuffyTheVampireSlayerS3E9TheWish The Wish]]" (season 3). When Giles (in a dystopian alternate timeline) smashes Anyanka's amulet, history is restored. It makes some sense, given that the spell was itself retroactive, but events early in season 7 may still lead one to question the logic.
** {{Subverted}} and {{Parodied}} in season 4's "[[Recap/BuffyTheVampireSlayerS4E4FearItself Fear Itself]]". Parodied EVEN MORE when said Fear Demon, who has an ominous depiction in the book's illustration of him, arrives. [[spoiler: He's literally the size of the drawing, and Buffy just stomps him with her foot.]]
--->'''[[TheMentor Giles]]:''' ''[reading]'' The summoning spell for Gachnar can be shut down in one of two ways. Destroying the Mark of Gachnar...\\
'''[[TheHero Buffy]]:''' ''[destroys the Mark of Gachnar]''\\
'''Giles:''' ''[annoyed]'' ...is ''not'' one of them, and will in fact [[NiceJobBreakingItHero immediately bring forth the Fear Demon, itself]]!
** Very explicitly played straight in "[[Recap/BuffyTheVampireSlayerS5E3TheReplacement The Replacement]]" (season 5): Xander has been split into two halves by a demon's spell, and Willow explains that there's not much to rejoining them -- their natural state is to be together and the spell is doing the work of keeping them apart, so all she has to do is end it.
** Played very straight in "[[Recap/BuffyTheVampireSlayerS7E3SameTimeSamePlace Same Time, Same Place]]" (season 7): to save Dawn from paralytic poison, the team must kill the demon that poisoned her. [[RuleOfFunny She recovers abruptly and funnily]].
%%* ''Series/{{Charmed}}'' was very bad, and inconsistent about this.
* ''Series/DoctorWho:''
** Played straight in [[Recap/DoctorWhoS1E2TheDaleks "The Daleks"]]. The Thals' anti-radiation drugs seem to restore the Doctor and company, who were nearly ''close to death from radiation poisoning'', almost instantly.
** [[Recap/DoctorWhoS4E2TheTenthPlanet "The Tenth Planet"]] ends with the titular planet's destruction sparking the death of all Cybermen on Earth. While it's said they were wholly dependent on power from Mondas, thus explaining why they died alongside it, not only do they drop dead almost instantly, but their organic parts, for almost no reason, disintegrate completely.
** Played straight in [[Recap/DoctorWhoS8E1TerrorOfTheAutons "Terror of the Autons"]], the Master's somewhat inauspicious debut. He awakens a dormant meteorite containing the Nestene Consciousness, which animates a group of Autons (plastic automata) he created, which go on to create second-generation Autons that also come alive with the Nestene Consciousness. When the Autons take care of the first phase of the invasion, the Master uses a radio telescope to broadcast some kind of energy that allows a Nestene mothership to instantly materialize in Earth's sky. When the Doctor reverses the polarity of the telescope, not only does the mothership disappear, but ''every Auton falls lifelessly to the ground''. Justified in that the Autons are not independently intelligent, but are directly controlled by the Nestene Consciousness.
** The ending of [[Recap/DoctorWhoS8E4ColonyInSpace "Colony in Space"]] implies that without the radiation caused by the Doomsday Weapon, the planet will instantly become fertile and provide ample sustenance to the colony who has chosen to continue living there.
** Also played straight in [[Recap/DoctorWhoS28E1NewEarth "New Earth"]]. The Doctor uses a vaccine to cure ArtificialHumans used as lab rats, complete with the visible signs of their illness disappearing before our eyes.
--->'''The Doctor:''' I'm the Doctor, and I ''cured them!''
** [[Recap/DoctorWhoS31E6TheVampiresOfVenice "The Vampires of Venice"]]: When Eleven turns off the generator that begun to give Venice its own natural-disaster apocalypse, including a tidal wave started by an earthquake, within less than a second the sky clears up, the clouds move, and everything is sunshine and rainbows.
** [[Recap/DoctorWhoS32E3TheCurseOfTheBlackSpot "The Curse of the Black Spot"]] features a MonsterOfTheWeek that enters our world using reflective surfaces as a gateway. At one point she does this via a crown; the Doctor responds by tossing said crown into the sea. This somehow causes the monster to vanish. The "monster" was actually a projection from a ship on the other side. Throwing the crown in the water severed the connection.
** [[Recap/DoctorWhoS34E10InTheForestOfTheNight "In the Forest of the Night"]]: After the solar flare, all the trees just melt away into fairy dust.
* ''Series/{{Ghosted}}'': DoubleSubverted in "The Machine". Leroy breaks the [[ImmortalityInducer Cronos machine]], to defeat its indestructible owner but it fails to have any effect. He then destroys the cursed tree powering it, which succeeds in undoing the immortality and turns him to dust.
* ''Series/{{Heroes}}:''
** Adam Monroe (spoilers ahead). [[spoiler:He's over 400 years old, but looks to be in his mid-twenties. However, once Arthur Petrelli steals his healing ability, [[NoImmortalInertia Monroe ages all 400 years, dies, and turns to dust. His youth and health have no ontological inertia.]] This is particularly aggravating in that it makes no sense with the way Monroe's powers work. They don't cover up his age or mask it, he has highly advanced regenerative capabilities. Logically, once he loses his power, he should just be normal, still young, but able to age and be hurt NOW. It's especially glaring with Claire, having the same healing powers, as a main character. When we first met her, her hobby was jumping from heights of several hundred feet just so her twisting her mangled limbs back into place and healing can be filmed, or severing body parts just to watch them grow back. A period of depowerment should mean an instant and gruesome death. Insteead... she's just normal, able to age and be hurt ''now.'']]
*** They try to explain it by claiming that [[spoiler:over the years, Adam has been hurt and killed so many times that his cells now continuously die and regenerate. It's possible that Arthur only took the "regenerate" part away, meaning all the cells in Adam's body instantly died]].
** In the Season 3 finale, Sylar activates Primatech's security system, causing heavy bars to drop over the windows and all the lights to go out. When [[spoiler:he "dies"]], the heavy barriers all rise and the lights turn back on. [[spoiler:The building then explodes, but for unrelated reasons]].
* ''Series/{{House}}'' is a regular offender. However, depending on the dramatic level of the episode, they might avert this.
* ''Series/KamenRiderDenO'' has an interesting dual case of this. Similar to the other kids show example above, when monsters go back in time to wreak havoc and the title character defeats them, any changes they've made to the timeline are reversed... almost. ''Human beings'' have no ontological inertia, since their existence is dependent on memories others have of them. So if someone is killed in the past, but everyone that knew them in the present loses their memories of them at the same time, that person won't come back to life, and will be forced to wander the timestream. This leads to a very glaring plot hole later in the series. Ryotaro isn't worried when [[spoiler:Yuuto is killed in the past, erasing his future self]] because by killing the MonsterOfTheWeek, all the damage is restored. Unfortunately, [[spoiler:Yuuto doesn't return because "Ryotaro never knew Yuuto at that age".]] All well and good, until it gets revealed that [[spoiler:Airi and Sakurai's plan to hide their child hinged on Ryotaro's memory: basically, the ''entire'' timeline would be reconstructed from his memory, sans the baby which was erased from his memories by the Zeronos Cards. What about all the other people that Ryotaro had never met?]]
* Averted in ''Series/KamenRiderDouble'''s portion of the {{Crossover}} ''Movie Wars CORE'': the Spider Dopant has the ability to plant "spider bombs" in people that go off if they get too close to their loved ones. The bombs are still active after his defeat, which forced Double's mentor to avoid his own daughter for the last decade.
* Averted in ''Series/KamenRiderGaim'': When Roshuo (the king of the [[MonsterOfTheWeek Inves]]) is killed, it does absolutely nothing to stop the spread of the [[AlienKudzu Forest of Helheim]] or the other Inves attacking; the only way to permanently end the threat is for someone to take Roshuo's place as the master of Helheim, abandoning their humanity in the process.
** Which turns out to not be a breach of the rule: it was ''thought'' that the Overlords were the {{Big Bad}}s sending the Helheim Forest into our world, but in fact, the forest [[spoiler: has a will of its own, personified in a guy we'd thought was a normal human, and has its own ideas as to why its spread is necessary. Roshuo's the top monster in ''his'' world, having claimed the key to some control of the forest, but he's far from the "master" of the series' events.]]
* The succubi in ''Series/KrodMandoonAndTheFlamingSwordOfFire'' reproduce by forcing an egg down a man's throat, which then swells in size inside their stomach to give them the "ninth month of pregnancy" look and apparently [[ChestBurster bursts out from their belly]] like in ''Alien''. That is, unless you slay the succubus that laid it, causing an immediate "miscarriage" and the victim vomiting up the remains. This could just be an effect of the Flaming Sword of Fire, as we don't see a succubus being slain with anything else, but it still doesn't make sense either way.
* In ''Series/LostGirl'', The Djieine's venom instantly disappears from its victims' bodies as soon as its heart is destroyed. Lauren starts to give a perfectly rational and sensible explanation (something to do with magnetic fields) for why it stopped instantly, but trails off when she sees that Bo doesn't understand any of it.
* In the ''Series/{{Merlin 1998}}'' series, Queen Mab's spells begin to lose their power and fade away after she disappears. It seems to take at least a few years, though.
* Extremely common in kids' shows, but perhaps best exemplified by ''Franchise/PowerRangers''. In such series, the destruction of a monster almost always reverses whatever effect his power has wrought on the community. In ''Franchise/PowerRangers'', even objects stolen by the villains will also be returned when the MonsterOfTheWeek is slain -- when it wasn't even that monster that took them. The most ridiculous example of this is in one episode of ''[[Series/PowerRangersDinoThunder Dino Thunder]]'' where the ocean-controlling monster has used his powers to summon a tsunami out of the depths, which is about to hit the city. The Rangers destroy the monster just as the wave is about to hit, and the tsunami fades away into nothingness.
** ''Franchise/SuperSentai'' does this as well, with occasional LampshadeHanging.
** Played straight in Series/HikoninSentaiAkibaranger but is usually justified due to the [[MonsterOfTheWeek monsters of the week]] being mere delusions. The battles are simulations the sentai-wannabe "heroes" take part in, all entirely in their heads. When they defeat the monster, they find themselves in reality again, usually wherever they were the first time the monster showed up as they haven't really moved and not much time has really passed. [[spoiler: Until the delusions manage to cross into reality that is...]]
* In Assignment 3 of ''Series/SapphireAndSteel'', the Changeling can reduce things to dust by touching them. When Steel returns him to his original condition, everything he had touched is instantly restored.
* Averted in ''Series/TheSarahJaneAdventures''' "Eye of the Gorgon". Defeating the Gorgon doesn't turn the people it's petrified back. You need to use the talisman, and it only works if they haven't been stone too long.
* ''Series/StarTrekTheOriginalSeries'' episode "The Deadly Years". A strange form of radiation causes Kirk, Spock, [=McCoy=] and Scotty to age at a rate of 10 years per day until they're all senior citizens. Once a medicine that neutralizes the radiation's effect is administered, they quickly de-age back to their original ages.
* Averted in the ''Series/StarTrekTheNextGeneration'' series finale. Picard (who is moving back and forth through time by Q) is warned by Q that he will be responsible for destroying humanity. In each time frame Picard travels to the Neutral Zone to investigate a "spatial anomaly". Eventually, Picard realizes that the inverse tachyon pulses he is using to scan the anomaly are [[NiceJobBreakingItHero actually creating it]] and will, in the far past, prevent the human race from ever coming into being ([[FromBadToWorse and all other life on earth, apparently]]). Turning off the beams does nothing, however, and Picard bemuses "Why isn't the anomaly being affected?" Turns out the anomaly does have ontological inertia, and the Enterprise has to find a way to repair it.
** Played straight in [[Film/StarTrekInsurrection Insurrection]] with Geordi La Forge's eyes being regenerated to normal functioning eyes, only to become blind again after the effect had caused it had worn off, as if healthy eyes require some kind of constant external effect to remain healthy and functional.
* In ''Series/StarTrekVoyager'''s two-part episode "Year of Hell", destroying the Krenim time-ship also undoes all of the changes it made to the timeline.
** While the above is Justified in the show[[note]]destroying the time ship caused it to erase ''itself'' from history, retroactively undoing all of its actions[[/note]], ''Voyager'' earned itself the nickname ''U.S.S. ResetButton'' for a combination of this and StatusQuoIsGod.
* In ''Series/SuperhumanSamuraiSyberSquad'', it's not automatic, but Servo and his accompanying HumongousMecha have a yellow beam to shine on damaged circuitry, reverting anything that's been reprogrammed or ''outright smashed'' to normal. On top of that, sometimes doing so fixes damage to the real world (for example, one MonsterOfTheWeek caused a factory to start putting out toxic gas. Fixing the damage in the Digital World that represents reprogramming some air filters means it doesn't put out any more gas? Understandable. ''This means the gas instantly fades?'' Uh...
* ''Series/{{Supernatural}}:''
** The changelings all asploded when the mother was killed.
** In the episode "Heart," whether or not werewolves are subject to ontological inertia is actually a central plot point. [[spoiler:Sam and Dean haven't seen a werewolf "since [they] were kids" (and presumably didn't actually participate in that hunt). Their father had a theory that if the werewolf who bit and turned another was killed, said other werewolf would turn back to a normal human. They test said theory. It doesn't work.]]
** In "Two Minutes to Midnight", Pestilence's mere presence infects the Winchesters with so many diseases they can't even stand. When he loses his RingOfPower, they're back on their feet in seconds.
** The same effect appears with [[TheGrimReaper Death's]] ring in the same episode. Chicago is being pummeled by a massive storm, which Bobby estimated would kill 3 million people. As soon as Dean has Death's ring in hand, however, the weather dies down and everything is fine.
** Similar case with the NighInvulnerable [[spoiler: Leviathans.]] They don't die, however with their leader [[spoiler: Dick Roman]] dead they have become "normal" monsters albeit extremely hard to kill. At least according to Crowley.
* Played in ''Series/TeenWolf''. Derek said there's a rumor that a turned Beta MAY be able to be cured by killing the Alpha who turned them. However, it doesn't say what happens to any other Beta's the Alpha may have turned, so it would at most be situational, or, it could just be a MotivationalLie Derek told in order to get Scott to cooperate with his plans.
* Played with in ''Series/ToddAndTheBookOfPureEvil''; whether it is played straight or averted seems to depend on the nature of the wish. The general rule seems to be that if the wish creates a separate physical monster, [[OntologicalInertia killing the wisher isn't enough]]. But if the wish is something more abstract or mental (brainwashing, brain-drain, teleporting the main cast, etc.), it will usually revert the moment the wisher dies. Though sometimes there are exceptions where the wish is lifted [[FateWorseThanDeath without the wisher dying]]...
* In ''Series/TheVampireDiaries'', when an Original Vampire is killed, all vampires created from their bloodline also die.
* Used inconsistently in ''Series/Warehouse13'' -- as soon as artifacts get neutralized, all their effects generally go away and people return to normal. There are numerous exceptions, though. Usually caused by a second artifact.
** In one particular case, a highly explosive artifact (a remnant of the London Blitz with all the firepower of the Nazi war machine)) is fueled by hate. They use Gandhi's Shroud to try to remove all negative emotions from the artifact, but the timer is still ticking. They finally realize that they need to use the Shroud on the BigBad, as, apparently, it's his hate that fuels the artifact. Apparently, killing him won't remove the hate. However, as soon as the Shroud is put on him, the timer stops. He apologizes and dies (guess there was nothing left in him but the hate).
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