History Main / RippleEffectProofMemory

24th Mar '17 1:37:38 AM Tsar673
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* On ''Series/Timeless'', time-travelers have RippleEffectProofMemory - whenever they return to the present after a time trip, they are surprised to discover how certain details in history have changed. Played to tragic effect in the first episode where [[spoiler: the protagonist, Lucy, returns home after her first time-jump only to discover that in the new reality, her sister was never born and she has a fiancee.]]

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* On ''Series/Timeless'', ''Series/((Timeless}}'' time-travelers have RippleEffectProofMemory - whenever they return to the present after a time trip, they are surprised to discover how certain details in history have changed. Played to tragic effect in the first episode where [[spoiler: the protagonist, Lucy, returns home after her first time-jump only to discover that in the new reality, her sister was never born and she has a fiancee.]]
24th Mar '17 1:36:50 AM Tsar673
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* On ''Series/Timeless'', time-travelers have RippleEffectProofMemory - whenever they return to the present after a time trip, they are surprised to discover how certain details in history have changed. Played to tragic effect in the first episode where [[spoiler: the protagonist, Lucy, returns home after her first time-jump only to discover that in the new reality, her sister was never born and she has a fiancee.]]
22nd Mar '17 11:05:00 PM JMQwilleran
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* SaveScumming is this in the {{Meta}} sense. You bungle a game, "go back in time", and with your knowledge of what you did wrong you can do something else. Some games try to avert this, such as ''VideoGame/AnimalCrossing'' where save scumming unleashes [[TheScrappy Reseti]] and forces you to listen to his long scolding, while ''VideoGame/{{Undertale}}'' [[spoiler:has ''other'' characters who remember when you save scum. See below.]]

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* SaveScumming is this in the {{Meta}} sense. You bungle a game, "go back in time", and with your knowledge of what you did wrong you can do something else. Some games try to avert this, such as ''VideoGame/AnimalCrossing'' where save scumming unleashes [[TheScrappy Reseti]] and forces you to listen to his long scolding, while ''VideoGame/{{Undertale}}'' [[spoiler:has ''other'' characters who remember when you save scum. See below.]]]] ''VideoGame/LostDimension'' tries another tactic by doing only save slot and forcing an autosave right before a point at which you would normally do this. Though that didn't stop some from simply copying the save to a backup and doing it that way.
19th Mar '17 3:12:00 AM TroperDoper
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19th Mar '17 3:06:48 AM TroperDoper
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* In ''Series/Misfits'' Curtis has the ability to reverse time when experiencing feelings of deep regret to a point that he could change events with the knowledge of what's to happen gained.
**In series 3, an old man uses Curtis' power to back in time to kill Hitler. He fails, which results in Hitler winning the war and Britain being under Nazi control in the present. Even though he changed history, he still remembers the original timeline. The power later gets passed onto Kelly who uses it to fix the man's mistakes and return everything to normal. Despite that timeline no longer existing, Kelly still retains her memories of that universe.
15th Mar '17 6:07:51 PM AthenaBlue
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* In ''Film/AboutTime'' only the person who makes the trip back in time possesses this. Tim's dad is a time traveler too, but doesn't remember the changes Tim makes.
** [[spoiler: At one point Tim travels back with his sister (who can't travel back in time on her own). When they return to the present ''her'' memory is affected (she suddenly knows she is in a different relationship in the altered timeline) but she also retains the knowlege they time travelled in the first place.]]
** In one conversation with his dad, Tim guesses that his dad may also have gone back and replayed it, and his dad confirms this. One wonders what'd happen if Tim and his dad really wanted opposite things from a conversation: would they both keep replaying it, flip-flopping the outcome, ad infinitum?



* Happened in ''Film/SourceCode''. The protagonist is on a mission to stop a bomb from blowing up a train. He has 8 minutes. Every time he fails (and hence dies), he is reset, still remembering what happened in the previous run. To everyone else, it's all happening for the first time.



* In ''Film/{{Deadpool}}'', the titular character, due to his NoFourthWall nature, can remember everything that's happened in the ''Film/XMen'' films, even the stuff that was erased by {{Cosmic Retcon}}s.
* Plot point in ''Film/EdgeOfTomorrow'', where the aliens have an edge over their human foes in combat by resetting the day and being able to remember what happened during the previous time loop. Cage accidentally acquires that power and turns it against the aliens.



* The disadvantages of this are touched on at the end of ''Film/{{Timecop}}'', where the hero is surprised to learn he now has a wife and son….

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* The disadvantages In ''Film/GalaxyQuest'', after Jason Nesmith activates the Omega 13 device, [[spoiler: time turns back 13 seconds into the past]]. Jason alone remains aware of the fact that the person who is about enter the bridge [[spoiler:is not really Tech Sergeant Chen but actually Saris in disguise.]]
* ''Film/GodzillaVsKingGhidorah'', the only Franchise/{{Godzilla}} movie so far to feature time travel, uses
this trope. After the timeline has been altered in UsefulNotes/WorldWarII so that King Ghidorah attacks Japan for decades instead of Godzilla, the main characters note the difference. Later when it turns out that Godzilla does still exist in this universe except bigger, they note they are touched on the only ones who can identify him and realize the change in size. The filmmakers seem to have forgotten this when they made ''Film/GodzillaVsSpaceGodzilla'' and everyone acts as if the timeline never changed and Godzilla hasn't been replaced with Ghidorah, as evidenced by ''Film/GodzillaVsBiollante'' being mentioned...yet references to Ghidorah are made and Godzilla is still at the end of ''Film/{{Timecop}}'', larger scale.
* Brazilian film ''O Homem do Futuro'' (The Man from the Future) has protagonist Zero accidentally going back 20 years to the prom that ruined his life. So he tries to SetRightWhatOnceWentWrong, and vanishes as history is changed, waking up back to the present day...
where he became rich, but is a JerkAss and the hero is surprised to learn love of his life hates him. So he now has a wife goes back again, and son….after leading things to go back the original way he vanishes again... returning to 2011 with memories of the entire time travel ordeal.



* Averted in ''Film/{{Looper}}''. Old Joe explains how his memories of the future/his past are in a constant state of flux. He remembers the circumstances under which he ended up in the past, and he remembers everything Young Joe did in the present the moment he does it...but his memories of the thirty years in-between grow cloudier due to the shifting probability of whether those events happen or not. It serves as a plot-point, with Old Joe desperately trying to [[spoiler: hang onto memories of his wife, when Young Joe gets involved with another woman]].
* Agent J has a ripple effect-proof memory in ''Film/MenInBlack3''. The actual mechanics of the effect in question are explained: you're immune to any changes in the timeline generated by alterations to an event which you were personally present at[[note]] so long as you survived the altered event[[/note]]. There are also specific symptoms of the effect: you get a headache and an inexplicable craving for "chocolatized dairy products".



* ''Film/GodzillaVsKingGhidorah'', the only Franchise/{{Godzilla}} movie so far to feature time travel, uses this trope. After the timeline has been altered in UsefulNotes/WorldWarII so that King Ghidorah attacks Japan for decades instead of Godzilla, the main characters note the difference. Later when it turns out that Godzilla does still exist in this universe except bigger, they note they are the only ones who can identify him and realize the change in size. The filmmakers seem to have forgotten this when they made ''Film/GodzillaVsSpaceGodzilla'' and everyone acts as if the timeline never changed and Godzilla hasn't been replaced with Ghidorah, as evidenced by ''Film/GodzillaVsBiollante'' being mentioned...yet references to Ghidorah are made and Godzilla is still at the larger scale.
* ''Film/StarTrekFirstContact''. The Enterprise can see the Borg!Earth timeline, but since they're in the wake of the time disturbance caused by the Borg Sphere, they're unaffected. It's strongly implied that they'd vanish from existence had they not went through the time aperture themselves.
* Agent J has a ripple effect-proof memory in ''Film/MenInBlack3''. The actual mechanics of the effect in question are explained: you're immune to any changes in the timeline generated by alterations to an event which you were personally present at[[note]] so long as you survived the altered event[[/note]]. There are also specific symptoms of the effect: you get a headache and an inexplicable craving for "chocolatized dairy products".
* Brazilian film ''O Homem do Futuro'' (The Man from the Future) has protagonist Zero accidentally going back 20 years to the prom that ruined his life. So he tries to SetRightWhatOnceWentWrong, and vanishes as history is changed, waking up back to the present day... where he became rich, but is a JerkAss and the love of his life hates him. So he goes back again, and after leading things to go back the original way he vanishes again... returning to 2011 with memories of the entire time travel ordeal.
* In ''Film/GalaxyQuest'', after Jason Nesmith activates the Omega 13 device, [[spoiler: time turns back 13 seconds into the past]]. Jason alone remains aware of the fact that the person who is about enter the bridge [[spoiler:is not really Tech Sergeant Chen but actually Saris in disguise.]]



* In ''Film/AboutTime'' only the person who makes the trip back in time possesses this. Tim's dad is a time traveler too, but doesn't remember the changes Tim makes.
** [[spoiler: At one point Tim travels back with his sister (who can't travel back in time on her own). When they return to the present ''her'' memory is affected (she suddenly knows she is in a different relationship in the altered timeline) but she also retains the knowlege they time travelled in the first place.]]
** In one conversation with his dad, Tim guesses that his dad may also have gone back and replayed it, and his dad confirms this. One wonders what'd happen if Tim and his dad really wanted opposite things from a conversation: would they both keep replaying it, flip-flopping the outcome, ad infinitum?
* In ''Film/XMenDaysOfFuturePast'', Wolverine is told up-front that he (and only he) will remember the BadFuture should he succeed in changing history. [[spoiler: In the end, he wakes up in the "good future" with his memories diverging from real history since it was changed in 1973.]]
** Professor X does have some memories of the original time line since his younger version linked to the original time line version through Logan. After Logan sees all the reset changes, Xavier tells him "they have a lot to talk about."
* Plot point in ''Film/EdgeOfTomorrow'', where the aliens have an edge over their human foes in combat by resetting the day and being able to remember what happened during the previous time loop. Cage accidentally acquires that power and turns it against the aliens.
* Averted in ''Film/{{Looper}}''. Old Joe explains how his memories of the future/his past are in a constant state of flux. He remembers the circumstances under which he ended up in the past, and he remembers everything Young Joe did in the present the moment he does it...but his memories of the thirty years in-between grow cloudier due to the shifting probability of whether those events happen or not. It serves as a plot-point, with Old Joe desperately trying to [[spoiler: hang onto memories of his wife, when Young Joe gets involved with another woman]].
* In ''Film/StargateContinuum'', a DelayedRippleEffect almost gets the team (minus the already-erased Teal'c and Vala) before they enter the Stargate. It turns out being in a wormhole at the time of the ripple effect makes you Ripple-Effect Proof. Who knew? Unusually, this example shows alternate versions of the man characters, except two -- one was never born, and another died a hero some time ago. A third is only ever "seen" from the wrong side of a phone line.



* In ''Film/{{Deadpool}}'', the titular character, due to his NoFourthWall nature, can remember everything that's happened in the ''Film/XMen'' films, even the stuff that was erased by {{Cosmic Retcon}}s.

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* In ''Film/{{Deadpool}}'', the titular character, due Happened in ''Film/SourceCode''. The protagonist is on a mission to his NoFourthWall nature, can remember everything that's stop a bomb from blowing up a train. He has 8 minutes. Every time he fails (and hence dies), he is reset, still remembering what happened in the ''Film/XMen'' films, even previous run. To everyone else, it's all happening for the stuff first time.
* In ''Film/StargateContinuum'', a DelayedRippleEffect almost gets the team (minus the already-erased Teal'c and Vala) before they enter the Stargate. It turns out being in a wormhole at the time of the ripple effect makes you Ripple-Effect Proof. Who knew? Unusually, this example shows alternate versions of the man characters, except two -- one was never born, and another died a hero some time ago. A third is only ever "seen" from the wrong side of a phone line.
* ''Film/StarTrekFirstContact''. The Enterprise can see the Borg!Earth timeline, but since they're in the wake of the time disturbance caused by the Borg Sphere, they're unaffected. It's strongly implied
that they'd vanish from existence had they not went through the time aperture themselves.
* The disadvantages of this are touched on at the end of ''Film/{{Timecop}}'', where the hero is surprised to learn he now has a wife and son…
* In ''Film/XMenDaysOfFuturePast'', Wolverine is told up-front that he (and only he) will remember the BadFuture should he succeed in changing history. [[spoiler: In the end, he wakes up in the "good future" with his memories diverging from real history since it
was erased by {{Cosmic Retcon}}s.changed in 1973.]]
** Professor X does have some memories of the original time line since his younger version linked to the original time line version through Logan. After Logan sees all the reset changes, Xavier tells him "they have a lot to talk about."



* ''Series/{{Angel}}'', of the eponymous vampire-detective series, had an episode in which he dealt with the Oracles (DeusExMachina disciples of the PowersThatBe) to have a day undone ''and'' so that he was the only one who had memory of the events. In ''After the Fall,'' there's a ResetButton, but ''[[SubvertedTrope everyone]]'' in LA remembers the HellOnEarth. Eventually, most people not part of the {{masquerade}} become convinced that it was just a SharedMassHallucination.
* ''Franchise/{{Arrowverse}}'':
** ''Series/TheFlash2014'':
*** In "Out of Time", Barry accidentally goes so fast that he goes back in time to one day in the past. At first Barry is the only person who remembers the events of "Out of Time", until "The Trap" when it is revealed that [[spoiler: Cisco]] has dreams about the AlternateTimeline [[spoiler: in which Harrison Wells kills him. In the season finale it's further revealed that the reason why Cisco remembers this is because he is a metahuman.]]
*** As time travel becomes increasingly frequent in the series, Ripple Effect Proof Memory is usually the norm. The one exception is in the Season 3 premiere ''Flashpoint'' in which [[spoiler: Barry gradually starts to lose memories of his original timeline, the more he uses his speed in the Flashpoint timeline. Once the Flashpoint timeline is undone and a new CloseEnoughTimeline is established however, Barry retains his memories of the original Season 1/2 timeline and of the months he spent in the Flashpoint timeline, but doesn't remember the unfamiliar aspects of the new timeline, such as the death of Cisco's brother Dante or the new CSI Julian Albert whom he's supposedly been sharing a lab with for the past year]].
*** The Season 3 BigBad Dr. Alchemy has effectively weaponized Ripple Effect Proof Memory. [[spoiler: He has the ability to not only reawaken the memories of people's lives in the alternate Flashpoint timeline, but also restore the metahuman abilities they had in that timeline. This is actually revealed to be Savitar's doing, as Alchemy is merely his conduit to the real world (Savitar is trapped in the Speed Force)]].
*** The show has an interesting twist with TheMultiverse. Apparently, changes on one Earth don't propagate to others, even if the timelines intersect at some point. So, when Harry and Jesse return from Earth-2, they also start noticing changes, and Harry immediately realizes the past was changed on Earth-1.
** On ''Series/LegendsOfTomorrow'' the "Legends" exist mostly outside the time stream in their craft and are thus immune to changes that might happen to it. They can thus see such "aberrations" and fix them before they become permanent.
*** During a trip to 1987, Martin Stein tells his younger self to make more time for his wife than only being about his work. Stein is soon hit with flashes of a strange woman he worries might be a new love. When he comes home in 2016, he finds the woman is Lilly, his daughter. As far as everyone else (including Barry Allen) is concerned, Lilly has always existed but Stein has no memory of her at all.
*** During a crossover, Caitlin Snow sees Stein and Lilly talking, notices how Stein isn't picking up on Lilly's references to the past and realizes something is wrong. Stein reveals the truth and how he intends to "correct" this by finding a way to erase Lilly as she should be. He defends himself on how the woman is a stranger but a horrified Caitlin points out that as far as Lilly herself is concerned, she's a woman not understanding why her loving father that she's always had a close relationship to is freezing her out.
* ''Series/{{Charmed}}''
** When Cole changes the past, with the help of the Avatars, to ensure his conquering of Pheobe's heart (well [[GoneHorriblyRight not really]]), Paige "accidentally" sneezes in the middle of the ripple effect, ending up in the alternate present where everyone else forgot about her. They were actually aiming to remove her from continuity, and it technically worked, but her presence there [[spoiler:destroyed Cole for good...until he came back, at least.]]
** Another example: In the first season finale, ''Déjà Vu All Over Again'', a demon repeatedly resets time to try to kill the Charmed Ones. Phoebe's power of premonition lets her retain some memories from each timeline, eventually remembering enough to defeat the demon.



** In "The Time Meddler", the Doctor's companions suppose that, should the Monk succeed in changing history, their own memories would instantly change. While this might seem to exclude the Doctor from this trope, the balance of evidence points the other way, and there's no way for the companions to be doing anything more than guessing.

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** [[Recap/DoctorWhoS1E6TheAztecs "The Aztecs"]] argues that you can't change the past anyway so the situation would never come up in the first place.
** In [[Recap/DoctorWhoS2E9TheTimeMeddler "The Time Meddler", Meddler"]], the Doctor's companions suppose that, should the Monk succeed in changing history, their own memories would instantly change. While this might seem to exclude the Doctor from this trope, the balance of evidence points the other way, and there's no way for the companions to be doing anything more than guessing.



** "The Aztecs" episodes argue that you can't change the past anyway so the situation would never come up in the first place.
** The first revival series stated that The Time War was "invisible to lesser beings, but devastating to higher forms." Thus, highly evolved species, particularly the temporally active ones, have ripple-proof memory. Comments by Creator/RussellTDavies explicitly name the Time Lords, Daleks, Gelth, Nestene Consciousness, and the Forests of Cheem as "higher beings". In ''The Stolen Earth'', a representative of the Shadow Proclamation explains that, in the wake of the Time War, the lesser races only know of the Time Lords at all from "legends passed down from the higher beings".
** In ''Flesh and Stone'', it is explicitly stated, first through events, and later through dialogue, that a time traveling human gets ripple-proof memory too. "You're a time traveler now, Amy. Changes the way you see the universe. Forever. Good! Isn't it?"
** "Hungry Earth" states that a human's ripple proof memory applies only to timeline changes from outside their own ''personal'' timeline, which is how [[spoiler: Amy forgets about Rory when he's 'eaten' by one of the time cracks. He's a big part of her life and then he goes missing.]] ''Cold Blood'' adds a further complication: if a change to history undermines a time traveler's own ''personal'' history, they are only partially protected: the relevant memories will change, but the traveler can resist this through concentration. The traveler in question fails to resist the change, so it is not clear that this ability is anything more than theoretical.
** ''Last of the Time Lords'': In what is known to Whovians as [[spoiler:[[http://tardis.wikia.com/wiki/The_Year_That_Never_Was The Year that Never Was]]]], characters aboard the [[spoiler:''Valiant'']] experience this because of their proximity to the [[spoiler:Paradox Machine]] allowed for it; "eye of the storm" sort of thing.
** ''The Waters of Mars'' involves a multiple-memory version on the Doctor's part: After altering history, he visualizes [[RippleEffectIndicator newspapers changing]] (implying new memories of new headlines) while still not forgetting what he himself had done. The Tenth Doctor explains to Donna in "[[Recap/DoctorWhoS30E2TheFiresOfPompeii Fires Of Pompeii]]" that, being a Time Lord, he can see multiple possible outcomes at once. Remembering on the ones he changed isn't that much of a stretch.
** ''The Big Bang'' adds yet another wrinkle: growing up near a crack in time can do unusual things to someone's memory. If they end up having their personal history changed, the original memories will still be present, buried in their subconscious. This effect remains even if they become a time traveler. The effects of proximity to a time crack are all-but-confirmed in "The Wedding of River Song", where Amy is again able to retain memories of timelines that never were.

to:

** "The Aztecs" episodes argue that you can't change the past anyway so the situation would never come up in the first place.
** The first revival series stated that The the Time War was [[Recap/DoctorWhoS27E3TheUnquietDead "invisible to lesser beings, but devastating to higher forms." "]] Thus, highly evolved species, particularly the temporally active ones, have ripple-proof memory. Comments by Creator/RussellTDavies explicitly name the Time Lords, Daleks, Gelth, Nestene Consciousness, and the Forests of Cheem as "higher beings". In ''The [[Recap/DoctorWhoS30E12TheStolenEarth "The Stolen Earth'', Earth"]], a representative of the Shadow Proclamation explains that, in the wake of the Time War, the lesser races only know of the Time Lords at all from "legends passed down from the higher beings".
** [[Recap/DoctorWhoS29E13LastOfTheTimeLords "Last of the Time Lords"]]: In ''Flesh what is known to Whovians as [[spoiler:[[http://tardis.wikia.com/wiki/The_Year_That_Never_Was The Year that Never Was]]]], characters aboard the [[spoiler:''Valiant'']] experience this because of their proximity to the [[spoiler:Paradox Machine]]. The Doctor describes it as being in "the eye of the storm".
** [[Recap/DoctorWhoS30E16TheWatersOfMars "The Waters of Mars"]] involves a multiple-memory version on the Doctor's part: After altering history, he visualizes [[RippleEffectIndicator newspapers changing]] (implying new memories of new headlines) while still not forgetting what he himself had done. The Tenth Doctor explained to Donna in [[Recap/DoctorWhoS30E2TheFiresOfPompeii "The Fires of Pompeii"]] that, being a Time Lord, he can see multiple possible outcomes at once. Remembering the ones he changed isn't that much of a stretch.
** In [[Recap/DoctorWhoS31E5FleshAndStone "Flesh
and Stone'', Stone"]] it is explicitly stated, first through events, and later through dialogue, that a time traveling human gets ripple-proof memory too. "You're a time traveler now, Amy. Changes the way you see the universe. Forever. Good! Isn't it?"
** "Hungry Earth" [[Recap/DoctorWhoS31E9ColdBlood "Cold Blood"]] states that a human's ripple proof memory applies only to timeline changes from outside their own ''personal'' timeline, which is how [[spoiler: Amy forgets about Rory when he's 'eaten' by one of the time cracks. He's a big part of her life and then he goes missing.]] ''Cold Blood'' adds There's a further complication: if a change to history undermines a time traveler's traveller's own ''personal'' history, they are only partially protected: the relevant memories will change, but the traveler can resist this through concentration. The traveler in question fails to resist the change, so it is not clear that this ability is anything more than theoretical.
** ''Last of the Time Lords'': In what is known to Whovians as [[spoiler:[[http://tardis.wikia.com/wiki/The_Year_That_Never_Was The Year that Never Was]]]], characters aboard the [[spoiler:''Valiant'']] experience this because of their proximity to the [[spoiler:Paradox Machine]] allowed for it; "eye of the storm" sort of thing.
** ''The Waters of Mars'' involves a multiple-memory version on the Doctor's part: After altering history, he visualizes [[RippleEffectIndicator newspapers changing]] (implying new memories of new headlines) while still not forgetting what he himself had done. The Tenth Doctor explains to Donna in "[[Recap/DoctorWhoS30E2TheFiresOfPompeii Fires Of Pompeii]]" that, being a Time Lord, he can see multiple possible outcomes at once. Remembering on the ones he changed isn't that much of a stretch.
** ''The
[[Recap/DoctorWhoS31E13TheBigBang "The Big Bang'' Bang"]] adds yet another wrinkle: growing up near a crack in time can do unusual things to someone's memory. If they end up having their personal history changed, the original memories will still be present, buried in their subconscious. This effect remains even if they become a time traveler. The effects of proximity to a time crack are all-but-confirmed in [[Recap/DoctorWhoS32E13TheWeddingOfRiverSong "The Wedding of River Song", Song"]], where Amy is again able to retain memories of timelines that never were.



** Going along with having one's personal history changed, ''The Day of the Doctor'' features three Doctors meeting and pulling off a combination of ScrewDestiny and TrickedOutTime to prevent what they see as their greatest failure. Their meeting and actions cause the timelines to go out of sync, causing only the "oldest" of the three Doctors to remember events. Assuming "The Curator" is indeed a far-future regeneration, then Eleven, the oldest of the three, loses memories as well.
** In ''Kill the Moon'', The Doctor describes the potential hatching of a large alien from the Earth's moon as a "grey area" in history, where he doesn't know the outcome. After the situation is resolved, he's asked what effect their choices will have, and the Doctor closes his eyes and meditates for a moment before answering, clearly using some kind of Time Lord ability to see how the timeline has resolved itself.

to:

** Going along with having one's personal history changed, ''The [[Recap/DoctorWho50thASTheDayOfTheDoctor "The Day of the Doctor'' Doctor"]] features three Doctors meeting and pulling off a combination of ScrewDestiny and TrickedOutTime to prevent what they see as their greatest failure. Their meeting and actions cause the timelines to go out of sync, causing only the "oldest" of the three Doctors to remember events. Assuming "The Curator" is indeed a far-future regeneration, then Eleven, the oldest of the three, loses memories as well.
** In ''Kill [[Recap/DoctorWhoS34E7KillTheMoon "Kill the Moon'', The Moon"]], the Doctor describes the potential hatching of a large alien from the Earth's moon as a "grey area" in history, where he doesn't know the outcome. After the situation is resolved, he's asked what effect their choices will have, and the Doctor closes his eyes and meditates for a moment before answering, clearly using some kind of Time Lord ability to see how the timeline has resolved itself.



* ''Series/{{Journeyman}}''
** A number of episodes deal with Dan himself, such as when he meets his own father on the day the latter planned on leaving his family. Dan convinces him to talk to his sons about it, so they don't end up blaming themselves in the future. When Dan goes back to the present, he asks his brother about that night and finds out that their father did indeed explain everything to them before leaving. Additionally, when Dan accidentally leaves a digital camera in the past, he comes back to find that not only has computing technology skyrocketed (nanotech is ubiquitous), but his son is now a daughter. He ends up restoring the timeline, despite his wife's objections. Luckily for him, she doesn't remember anything.
* ''Series/StargateSG1'' ("2010", "Moebius") and ''Series/StargateAtlantis'' ("Before I Sleep", "The Last Man"). Both follow the logic which states that the time-travelers should have alternative counterparts in the new timeline. Their earlier counterparts always seem to [[CloningBlues conveniently end up dying.]]

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* ''Series/{{Journeyman}}''
''Series/{{Eureka}}'' explores this to great effect several times. First, a season finale involves Jack traveling from the future to prevent all of reality from unraveling due to [[spoiler:Henry previously going back in time to save his lover]]. In the following episode, he tries to ensure that his memories of his happy life with Alison come true, but inadvertently puts her off with his familiar attitude. Also, he notes that events are already changing, so the same future will no longer occur. Henry uses a device to erase Jack's memories of the future to spare him the pain, while keeping his own memories (of a slightly different future) intact. Then there's a whole season devoted to the main characters coming back from the 40s with Dr. Grant (who hitched a ride back with them) and seeing the changes made to Eureka. All of them remember the old timeline and try to keep quiet, as Eureka actually has protocols for just such an occurance. Henry is now married. Fargo is the head of Global Dynamics (partly thanks to his grandfather never having been frozen in the past in this reality). Alison's son is no longer autistic. Jack has never broken up with his girlfriend. Notably, the original timeline never gets restored, although Grant tries to alter it once again to no avail.
* In ''Series/{{Frequency}}'' Raimy Sullivan is the only one who sees how the present changes due to her father Frank affecting things in 1996 (the two linked by talking via a ham radio). Raimy remembers the old timeline but now has memories of this new history. However, they're not instant; it takes being told a body has been identified as her mother for Raimy to "remember" her mom vanishing in 1997.
* The fourth season of ''Series/{{Fringe}}'' [[spoiler:is largely about exploring the implications of this concept. First with the adult version of Peter recorporealizing in an altered timeline where he died as a child, then with Olivia recovering her memories from the prior timeline at the expense of the ones that correspond with the current version of reality.]]
** The observers were also always this way.
** In season 5, [[spoiler: Nina Sharp, and then Walter Bishop, regain their memory of the former timeline.]] In the season finale, [[spoiler: Walter and Michael become the only characters to remember the observer invasion, but get displaced in time.]]
* Audrey Parker of ''Series/{{Haven}}'' is immune to the cursed powers of the town's residents, meaning that when reality goes sideways (versions so far include GroundhogDayLoop, RetGone, and ButterflyOfDoom), she'll be the only one to notice things aren't normal. The GenreSavvy cast have learned to pay attention when she tells them about it.
* In ''Series/{{Heroes}}'', "Five Years Gone", Future Hiro remembers the timeline where Claire wasn't saved, but nobody else does. Interestingly, because Claire's survival is kept a secret from Future Hiro, he doesn't notice a difference between the timeline in which Claire was killed and the one in which she wasn't. Because of this, it's debatable whether he has Ripple-Proof Memory or not - because there's no difference, we wouldn't know if he previous memory was overwritten as soon as he sent Peter to save Claire.
* ''Series/{{Journeyman}}'':
A number of episodes deal with Dan himself, such as when he meets his own father on the day the latter planned on leaving his family. Dan convinces him to talk to his sons about it, so they don't end up blaming themselves in the future. When Dan goes back to the present, he asks his brother about that night and finds out that their father did indeed explain everything to them before leaving. Additionally, when Dan accidentally leaves a digital camera in the past, he comes back to find that not only has computing technology skyrocketed (nanotech is ubiquitous), but his son is now a daughter. He ends up restoring the timeline, despite his wife's objections. Luckily for him, she doesn't remember anything.
* ''Series/KamenRiderRyuki'': All Kamen Riders recruited by Shiro Kanzaki [[spoiler:can have their memories erased when Kamen Rider Odin performs his Time Vent move]]. Since Shinji just stumbled onto his [[TransformationTrinket card deck]], this makes him immune.
* In ''Series/KamenRiderDenO'', the Singularity Points like protagonist Ryotaro don't just have this, they have Ripple Effect Proof '''Existence''', meaning that they can exist outside of time and changes to the timeline don't affect them at all. This is a major plot point in several parts of the show, most prominently [[spoiler:the mystery behind Yuuto Sakurai, who disappeared one year before the show and who has vanished from the memories of everyone who knew him - except Ryotaro, who is quite shocked when a teenager claiming to be Sakurai appears about halfway through the show as a rival Kamen Rider.]]
** To put a fine point on it, [[TheMovie movie]] villain Gaoh tries to kill Ryotaro, but because he's a Singularity Point, the only way to off him and make it stick is to ''[[TheresNoKillLikeOverkill erase the date of Ryotaro's birth from history]]''.
* In ''Series/LegendOfTheSeeker'', [[AWizardDidIt Zedd]] tries to cast a spell to "de-program" Cara, but it backfires and results in a new timeline caused by Cara never becoming a Mord-Sith and, thus, not leading the Mord-Sith and [[BigBad Darken Rahl]] to Richard as he was performing the Boxes of Orden ritual. Richard and Kahlan were able to complete the ritual and make the known world [[MoreThanMindControl loyal to Richard]]. Richard becomes rules of [[TheEmpire D'Hara]] with Darken Rahl as his loyal advisor. Everything is great, as Zedd appears to be the only one who remembers the original timeline. Then it turns out that [[TheDevil the Keeper]] remembers it as well, and orchestrates to break the power of Orden. Luckily, Zedd is able to get a CloseEnoughTimeline by using the same spell on another Mord-Sith (thus, undoing the first casting).
* Used in ''Series/MysteryScienceTheater3000'' episode 821 "Time Chasers". Crow, attempting to help Mike, goes back in time to keep him from getting stranded in space. When he returns, he learns that instead of Mike, he's partnered with his chain-smoking, beer-swilling Jerkass brother Eddie, who's whipped Servo into a quivering yes-man; only Crow remembers the original timeline, which he eventually restores.
** The funniest part is that Eddie doesn't doubt him at all. He just gets pissed that Crow thinks their timeline "sucks".
* Averted in ''Series/MythQuest''. It is possible for the characters to travel into a myth and act it out, including a different ending. If that happens, everyone in the real world remembers the myth differently. While they don't remember what the myth was, they do remember that they changed it.
* In "A Stitch in Time," an episode of the revived ''Series/TheOuterLimits1995'', an already-unbalanced scientist uses her time machine to go back and execute notorious serial killers before they hurt anyone. Each time history changes, and she remembers each and every change, driving her crazier and crazier. In the end, [[spoiler: she (and a homicide detective following her murders) go back in time to save her younger self from the sexual assault which originally caused her problems. The scientist loses this (having essentially erased herself), but the detective gains it and realizes that her best friend was killed by one of the serial killers whom the scientist had no motivation to kill in the current timeline. The detective then starts killing serial killers...]]
* In the ''Series/PowerRangersTimeForce'' episode "The Legend of the Clock Tower", Wes tells Katie the story of Walter, the man who built the clock tower, and how he was too timid to stand up for the woman he loved, resulting in him living his life all alone. After seeing Walter's ghost, Katie is pulled back in time, and helps Walter win his love's affections. She then wakes up in her bed, leaving her to wonder if it was AllJustADream. But when she reminds Wes of the original story, he insists that he told her it happened the way she caused it to, and that Walter lived happily with his love.
* In ''Series/{{Primeval}}'' series 2, Nick and Helen Cutter are the only ones who can remember [[spoiler:Claudia Brown]]. Later, [[spoiler:Jenny]], the alternate version of [[spoiler:Claudia]], finds a photo of [[spoiler:her]]self that [[spoiler:she]] doesn't recall posing for. [[spoiler:She]] realizes that everything Nick said was true.
** Unusually, the altered timeline stays altered. By the time the latest season rolls around, the only people who remembered the original timeline [[spoiler:are dead]]. Then again, it's been a long time since anyone cared about this. Even Nick stopped trying to change things and accepted the new reality.
* Inconsistently subverted on ''Series/QuantumLeap,'' where sometimes Sam remembers the unaltered timeline, and sometimes -- as in the case of one change that resulted in his earlier self marrying the girl that initially got away -- he doesn't. Some of this can be {{handwave}}d away with his "swiss cheese memory", but not all of it. The bulk of evidence suggests that if Sam's memory is changed at all, the changes only occur when he leaps. Al, however, always seems to remember the old timeline -- that is, if he hasn't been erased and replaced by Roddy [=MacDowell=], at least. It helps that he has Ziggy.
* ''Series/RedDwarf'':
** Rimmer and Holly display this ability in the episode "Timeslides".
** In "Angels & Demons", Lister mentions having "played pool with planets" as a point of reference for the remarkability of his first taste of an edible pot noodle. However, according to Kryten's explanation at the end of "White Hole", he shouldn't have been able to remember that. [[RuleOfFunny But that's okay.]]
* ''Series/TheSarahJaneAdventures'': In the episode "What Ever Happened to Sarah Jane?", an alien artifact bestows this power on whoever holds it at the "time" of the Ripple Effect.
* Parker, the hero from ''Series/SevenDays'', was picked by Project Backstep for his high tolerance for pain and a photographic memory. He would be briefed on the event that needed to be changed and sent back to change it. Though neither he, nor other characters from the series have this ability. It ''did'' happen to a kid where the alien spacecraft went through a ''plane'', who could remember the past seven days. Parker on the other hand, if he's not the one piloting the machine, forgets like the rest of them. This was actually the plot point of one episode, where Parker is about to be sent back in time, when he spits out the awful tea Olga gives him on the controls, causing a short which kick-starts the Backstep with only his duffel bag in the Sphere. Amazingly, the Sphere ends up in the same place 7 days prior, but all they find inside is the bag with a key (an actual key). They have no idea what needs to be stopped, so Dr. Mentnor re-enlists the help of a psychic whom he used once to try to resolve a hostage situation (the failure drove the little girl to a mental hospital). After touching the key, she starts getting glimpses of the future 7 days. With her help, the crisis is averted, although she does warn Parker to lay off Olga's tea.
* In ''Series/{{Smallville}}'', Clark travels backwards in time at least three times (once with a [[MagicFromTechnology Kryptonian Crystal]] to save Lana's life, once with the future Legion of Superheroes' ring to [[ResetButton undo]] his revealing to the world, and once to save himself as a baby in Krypton), and always remembers the timelines that no longer exist. None is longer than a day or two, so it's not a big deal. Also, this is Franchise/{{Superman}}, so he's ''Everything''-proof. In the lead up to the third example, Kara sent a message from past Krypton, which Dr Swan received in 1989 and recorded in his journal. Clark, reading the journal in 2007, notices the page is "new".
* ''Series/StargateSG1'' ("2010", "Moebius") and ''Series/StargateAtlantis'' ("Before I Sleep", "The Last Man"). Both follow the logic which states that the time-travelers time travellers should have alternative counterparts in the new timeline. Their earlier counterparts always seem to [[CloningBlues conveniently end up dying.]]



* In ''Series/{{Heroes}}'', "Five Years Gone", Future Hiro remembers the timeline where Claire wasn't saved, but nobody else does. Interestingly, because Claire's survival is kept a secret from Future Hiro, he doesn't notice a difference between the timeline in which Claire was killed and the one in which she wasn't. Because of this, it's debatable whether he has Ripple-Proof Memory or not - because there's no difference, we wouldn't know if he previous memory was overwritten as soon as he sent Peter to save Claire.
* ''Series/RedDwarf'':
** Rimmer and Holly display this ability in the episode "Timeslides".
** In "Angels & Demons", Lister mentions having "played pool with planets" as a point of reference for the remarkability of his first taste of an edible pot noodle. However, according to Kryten's explanation at the end of "White Hole", he shouldn't have been able to remember that. [[RuleOfFunny But that's okay.]]
* In ''Series/{{Primeval}}'' series 2, Nick and Helen Cutter are the only ones who can remember [[spoiler:Claudia Brown]]. Later, [[spoiler:Jenny]], the alternate version of [[spoiler:Claudia]], finds a photo of [[spoiler:her]]self that [[spoiler:she]] doesn't recall posing for. [[spoiler:She]] realizes that everything Nick said was true.
** Unusually, the altered timeline stays altered. By the time the latest season rolls around, the only people who remembered the original timeline [[spoiler:are dead]]. Then again, it's been a long time since anyone cared about this. Even Nick stopped trying to change things and accepted the new reality.
* Used in ''Series/MysteryScienceTheater3000'' episode 821 "Time Chasers". Crow, attempting to help Mike, goes back in time to keep him from getting stranded in space. When he returns, he learns that instead of Mike, he's partnered with his chain-smoking, beer-swilling Jerkass brother Eddie, who's whipped Servo into a quivering yes-man; only Crow remembers the original timeline, which he eventually restores.
** The funniest part is that Eddie doesn't doubt him at all. He just gets pissed that Crow thinks their timeline "sucks".



* Inconsistently subverted on ''Series/QuantumLeap,'' where sometimes Sam remembers the unaltered timeline, and sometimes -- as in the case of one change that resulted in his earlier self marrying the girl that initially got away -- he doesn't. Some of this can be {{handwave}}d away with his "swiss cheese memory", but not all of it. The bulk of evidence suggests that if Sam's memory is changed at all, the changes only occur when he leaps. Al, however, always seems to remember the old timeline -- that is, if he hasn't been erased and replaced by Roddy [=MacDowell=], at least. It helps that he has Ziggy.
* In the episode "What Ever Happened to Sarah Jane" of ''Series/TheSarahJaneAdventures'', an alien artifact bestows this power on whoever holds it at the "time" of the Ripple Effect.
* In "A Stitch in Time," an episode of the revived ''Series/TheOuterLimits1995'', an already-unbalanced scientist uses her time machine to go back and execute notorious serial killers before they hurt anyone. Each time history changes, and she remembers each and every change, driving her crazier and crazier. In the end, [[spoiler: she (and a homicide detective following her murders) go back in time to save her younger self from the sexual assault which originally caused her problems. The scientist loses this (having essentially erased herself), but the detective gains it and realizes that her best friend was killed by one of the serial killers whom the scientist had no motivation to kill in the current timeline. The detective then starts killing serial killers...]]



* ''Series/{{Angel}}'', of the eponymous vampire-detective series, had an episode in which he dealt with the Oracles (DeusExMachina disciples of the PowersThatBe) to have a day undone ''and'' so that he was the only one who had memory of the events. In ''After the Fall,'' there's a ResetButton, but ''[[SubvertedTrope everyone]]'' in LA remembers the HellOnEarth. Eventually, most people not part of the {{masquerade}} become convinced that it was just a SharedMassHallucination.
* ''Series/KamenRiderRyuki'': All Kamen Riders recruited by Shiro Kanzaki [[spoiler:can have their memories erased when Kamen Rider Odin performs his Time Vent move]]. Since Shinji just stumbled onto his [[TransformationTrinket card deck]], this makes him immune.

to:

* ''Series/{{Angel}}'', In ''Series/{{Timeless}}'' the trio who go through time to stop a criminal are immune to changes brought about. Thus, when they return from their first mission, they find that according to history books, the ''Hindenburgh'' was destroyed a day later by "anarchists" (actually, them) and only two people died. Meanwhile, historian Lucy returns home to discover that her comatose mother is alive and well, Lucy is engaged to a man she's never met and her sister Amy was never born.
** When Lucy tries to explain this to Mason, the inventor
of the eponymous vampire-detective series, had time machine, and their NSA contact, they're confused as her file shows no sister. Lucy shows them a locket with Amy's picture that she'd been wearing during the trip so it still survives. Mason is astounded to realize Lucy has an artifact of a timeline that no longer exists.
** Addressed in another
episode when NSA contact Christopher gives Lucy a data file containing photos and videos of Christopher's family to keep in which he dealt with the Oracles (DeusExMachina disciples of the PowersThatBe) to have a day undone ''and'' so time ship. Christopher says that she wants to be sure that, should Lucy come back and find Christopher's family no longer exists, some record of them survives.
* Kicks off a plot arc on ''Series/{{Warehouse 13}}''. Artie uses a cursed device to go back 24 hours and [[spoiler: avert worldwide catastrophe]]; obviously,
he was the only one who had memory of the events. In ''After the Fall,'' there's a ResetButton, but ''[[SubvertedTrope everyone]]'' in LA arrives JustInTime to do so, and remembers what needs to be done. [[spoiler: But the HellOnEarth. Eventually, most people side effects aren't pretty.]]
-->[[spoiler: '''Pete:''' I’m
not part of going to remember, am I? ]]
-->[[spoiler: '''Artie:''' Remember what? ]]
-->[[spoiler: '''Pete:''' Dying. ]]
-->[[spoiler: '''Artie:''' [[TeamDad No. No, Pete, you won’t remember.]] ''Pete dies.'' [[TearJerker But I will.]] ]]
** While Artie does rewind
the {{masquerade}} become convinced time and change what was going to happen, the artifact he uses inexplicably disappears from its hiding place, which tips off [[spoiler:Brother Adrian]] that it was just something's up. Additionally, Helena gets suspicious and later correctly guesses what Artie has done, having some experience with MentalTimeTravel herself (albeit in a SharedMassHallucination.
* ''Series/KamenRiderRyuki'': All Kamen Riders recruited by Shiro Kanzaki [[spoiler:can have their memories erased when Kamen Rider Odin performs his Time Vent move]]. Since Shinji just stumbled onto his [[TransformationTrinket card deck]], this makes him immune.
YouAlreadyChangedThePast way).



* In ''Series/KamenRiderDenO'', the Singularity Points like protagonist Ryotaro don't just have this, they have Ripple Effect Proof '''Existence''', meaning that they can exist outside of time and changes to the timeline don't affect them at all. This is a major plot point in several parts of the show, most prominently [[spoiler:the mystery behind Yuuto Sakurai, who disappeared one year before the show and who has vanished from the memories of everyone who knew him - except Ryotaro, who is quite shocked when a teenager claiming to be Sakurai appears about halfway through the show as a rival Kamen Rider.]]
** To put a fine point on it, [[TheMovie movie]] villain Gaoh tries to kill Ryotaro, but because he's a Singularity Point, the only way to off him and make it stick is to ''[[TheresNoKillLikeOverkill erase the date of Ryotaro's birth from history]]''.
* In ''Series/{{Smallville}}'', Clark travels backwards in time at least three times (once with a [[MagicFromTechnology Kryptonian Crystal]] to save Lana's life, once with the future Legion of Superheroes' ring to [[ResetButton undo]] his revealing to the world, and once to save himself as a baby in Krypton), and always remembers the timelines that no longer exist. None is longer than a day or two, so it's not a big deal. Also, this is Franchise/{{Superman}}, so he's ''Everything''-proof. In the lead up to the third example, Kara sent a message from past Krypton, which Dr Swan received in 1989 and recorded in his journal. Clark, reading the journal in 2007, notices the page is "new".
* ''Series/{{Charmed}}''
** When Cole changes the past, with the help of the Avatars, to ensure his conquering of Pheobe's heart (well [[GoneHorriblyRight not really]]), Paige "accidentally" sneezes in the middle of the ripple effect, ending up in the alternate present where everyone else forgot about her. They were actually aiming to remove her from continuity, and it technically worked, but her presence there [[spoiler:destroyed Cole for good...until he came back, at least.]]
** Another example: In the first season finale, ''Déjà Vu All Over Again'', a demon repeatedly resets time to try to kill the Charmed Ones. Phoebe's power of premonition lets her retain some memories from each timeline, eventually remembering enough to defeat the demon.
* Parker, the hero from ''Series/SevenDays'', was picked by Project Backstep for his high tolerance for pain and a photographic memory. He would be briefed on the event that needed to be changed and sent back to change it. Though neither he, nor other characters from the series have this ability. It ''did'' happen to a kid where the alien spacecraft went through a ''plane'', who could remember the past seven days. Parker on the other hand, if he's not the one piloting the machine, forgets like the rest of them. This was actually the plot point of one episode, where Parker is about to be sent back in time, when he spits out the awful tea Olga gives him on the controls, causing a short which kick-starts the Backstep with only his duffel bag in the Sphere. Amazingly, the Sphere ends up in the same place 7 days prior, but all they find inside is the bag with a key (an actual key). They have no idea what needs to be stopped, so Dr. Mentnor re-enlists the help of a psychic whom he used once to try to resolve a hostage situation (the failure drove the little girl to a mental hospital). After touching the key, she starts getting glimpses of the future 7 days. With her help, the crisis is averted, although she does warn Parker to lay off Olga's tea.
* The fourth season of ''Series/{{Fringe}}'' [[spoiler:is largely about exploring the implications of this concept. First with the adult version of Peter recorporealizing in an altered timeline where he died as a child, then with Olivia recovering her memories from the prior timeline at the expense of the ones that correspond with the current version of reality.]]
** The observers were also always this way.
** In season 5, [[spoiler: Nina Sharp, and then Walter Bishop, regain their memory of the former timeline.]] In the season finale, [[spoiler: Walter and Michael become the only characters to remember the observer invasion, but get displaced in time.]]
* ''Series/{{Eureka}}'' explores this to great effect several times. First, a season finale involves Jack traveling from the future to prevent all of reality from unraveling due to [[spoiler:Henry previously going back in time to save his lover]]. In the following episode, he tries to ensure that his memories of his happy life with Alison come true, but inadvertently puts her off with his familiar attitude. Also, he notes that events are already changing, so the same future will no longer occur. Henry uses a device to erase Jack's memories of the future to spare him the pain, while keeping his own memories (of a slightly different future) intact. Then there's a whole season devoted to the main characters coming back from the 40s with Dr. Grant (who hitched a ride back with them) and seeing the changes made to Eureka. All of them remember the old timeline and try to keep quiet, as Eureka actually has protocols for just such an occurance. Henry is now married. Fargo is the head of Global Dynamics (partly thanks to his grandfather never having been frozen in the past in this reality). Alison's son is no longer autistic. Jack has never broken up with his girlfriend. Notably, the original timeline never gets restored, although Grant tries to alter it once again to no avail.
* Averted in ''Series/MythQuest''. It is possible for the characters to travel into a myth and act it out, including a different ending. If that happens, everyone in the real world remembers the myth differently. While they don't remember what the myth was, they do remember that they changed it.
* Audrey Parker of ''Series/{{Haven}}'' is immune to the cursed powers of the town's residents, meaning that when reality goes sideways (versions so far include GroundhogDayLoop, RetGone, and ButterflyOfDoom), she'll be the only one to notice things aren't normal. The GenreSavvy cast have learned to pay attention when she tells them about it.

to:

* In ''Series/KamenRiderDenO'', the Singularity Points like protagonist Ryotaro don't just have this, they have Ripple Effect Proof '''Existence''', meaning that they can exist outside of time and changes to the timeline don't affect them at all. This is a major plot point in several parts of the show, most prominently [[spoiler:the mystery behind Yuuto Sakurai, who disappeared one year before the show and who has vanished from the memories of everyone who knew him - except Ryotaro, who is quite shocked when a teenager claiming to be Sakurai appears about halfway through the show as a rival Kamen Rider.]]
** To put a fine point on it, [[TheMovie movie]] villain Gaoh tries to kill Ryotaro, but because he's a Singularity Point, the only way to off him and make it stick is to ''[[TheresNoKillLikeOverkill erase the date of Ryotaro's birth from history]]''.
* In ''Series/{{Smallville}}'', Clark travels backwards in time at least three times (once with a [[MagicFromTechnology Kryptonian Crystal]] to save Lana's life, once with the future Legion of Superheroes' ring to [[ResetButton undo]] his revealing to the world, and once to save
''Series/TheWorstYearOfMyLifeAgain'', Alex finds himself as a baby in Krypton), reliving the previous year, and always remembers the timelines he knows what's going to happen to him. Downplayed - he specifically says that no longer exist. None is longer than a day or two, so it's not a big deal. Also, this is Franchise/{{Superman}}, so he's ''Everything''-proof. In the lead up to the third example, Kara sent a message from past Krypton, which Dr Swan received in 1989 and recorded in his journal. Clark, reading the journal in 2007, notices the page is "new".
* ''Series/{{Charmed}}''
** When Cole changes the past, with the help of the Avatars, to ensure his conquering of Pheobe's heart (well [[GoneHorriblyRight not really]]), Paige "accidentally" sneezes in the middle of the ripple effect, ending up in the alternate present where everyone else forgot about her. They were actually aiming to remove her from continuity, and it technically worked, but her presence there [[spoiler:destroyed Cole for good...until
he came back, at least.]]
** Another example: In
doesn’t perfectly remember ''everything'' that happened the first season finale, ''Déjà Vu All Over Again'', a demon repeatedly resets time to try to kill the Charmed Ones. Phoebe's power of premonition lets her retain some memories from each timeline, eventually remembering enough to defeat the demon.
* Parker, the hero from ''Series/SevenDays'', was picked by Project Backstep for his high tolerance for pain and a photographic memory. He would be briefed on the event that needed to be changed and sent back to change it. Though neither he, nor other characters from the series have this ability. It ''did'' happen to a kid where the alien spacecraft went through a ''plane'', who could remember the past seven days. Parker on the other hand, if he's not the one piloting the machine, forgets like the rest of them. This was actually the plot point of one episode, where Parker is about to be sent back in time, when he spits out the awful tea Olga gives him on the controls, causing a short which kick-starts the Backstep with only his duffel bag in the Sphere. Amazingly, the Sphere ends up in the same place 7 days prior, but all they find inside is the bag with a key (an actual key). They have no idea what needs to be stopped, so Dr. Mentnor re-enlists the help of a psychic whom he used once to try to resolve a hostage situation (the failure drove the little girl to a mental hospital). After touching the key, she starts getting glimpses of the future 7 days. With her help, the crisis is averted, although she does warn Parker to lay off Olga's tea.
* The fourth season of ''Series/{{Fringe}}'' [[spoiler:is largely about exploring the implications of this concept. First with the adult version of Peter recorporealizing in an altered timeline where he died as a child, then with Olivia recovering her memories from the prior timeline at the expense of the ones that correspond with the current version of reality.]]
** The observers were also always this way.
** In season 5, [[spoiler: Nina Sharp, and then Walter Bishop, regain their memory of the former timeline.]] In the season finale, [[spoiler: Walter and Michael become the only characters to remember the observer invasion, but get displaced in time.]]
* ''Series/{{Eureka}}'' explores this to great effect several times. First, a season finale involves Jack traveling from the future to prevent all of reality from unraveling due to [[spoiler:Henry previously going back in time to save his lover]]. In the following episode, he tries to ensure that his memories of his happy life with Alison come true, but inadvertently puts her off with his familiar attitude. Also, he notes that events are already changing, so the same future will no longer occur. Henry uses a device to erase Jack's memories of the future to spare him the pain, while keeping his own memories (of a slightly different future) intact. Then there's a whole season devoted to the main characters coming back from the 40s with Dr. Grant (who hitched a ride back with them) and seeing the changes made to Eureka. All of them remember the old timeline and try to keep quiet, as Eureka actually has protocols for just such an occurance. Henry is now married. Fargo is the head of Global Dynamics (partly thanks to his grandfather never having been frozen in the past in this reality). Alison's son is no longer autistic. Jack has never broken up with his girlfriend. Notably, the original timeline never gets restored, although Grant tries to alter it once again to no avail.
* Averted in ''Series/MythQuest''. It is possible for the characters to travel into a myth and act it out, including a different ending. If that happens, everyone in the real world remembers the myth differently. While they don't remember what the myth was, they do remember that they changed it.
* Audrey Parker of ''Series/{{Haven}}'' is immune to the cursed powers of the town's residents, meaning that when reality goes sideways (versions so far include GroundhogDayLoop, RetGone, and ButterflyOfDoom), she'll be the only one to notice things aren't normal. The GenreSavvy cast have learned to pay attention when she tells them about it.
around.



* Kicks off a plot arc on ''Series/{{Warehouse 13}}''. Artie uses a cursed device to go back 24 hours and [[spoiler: avert worldwide catastrophe]]; obviously, he arrives JustInTime to do so, and remembers what needs to be done. [[spoiler: But the side effects aren't pretty.]]
-->[[spoiler: '''Pete:''' I’m not going to remember, am I? ]]
-->[[spoiler: '''Artie:''' Remember what? ]]
-->[[spoiler: '''Pete:''' Dying. ]]
-->[[spoiler: '''Artie:''' [[TeamDad No. No, Pete, you won’t remember.]] ''Pete dies.'' [[TearJerker But I will.]] ]]
** While Artie does rewind the time and change what was going to happen, the artifact he uses inexplicably disappears from its hiding place, which tips off [[spoiler:Brother Adrian]] that something's up. Additionally, Helena gets suspicious and later correctly guesses what Artie has done, having some experience with MentalTimeTravel herself (albeit in a YouAlreadyChangedThePast way).
* In ''Series/LegendOfTheSeeker'', [[AWizardDidIt Zedd]] tries to cast a spell to "de-program" Cara, but it backfires and results in a new timeline caused by Cara never becoming a Mord-Sith and, thus, not leading the Mord-Sith and [[BigBad Darken Rahl]] to Richard as he was performing the Boxes of Orden ritual. Richard and Kahlan were able to complete the ritual and make the known world [[MoreThanMindControl loyal to Richard]]. Richard becomes rules of [[TheEmpire D'Hara]] with Darken Rahl as his loyal advisor. Everything is great, as Zedd appears to be the only one who remembers the original timeline. Then it turns out that [[TheDevil the Keeper]] remembers it as well, and orchestrates to break the power of Orden. Luckily, Zedd is able to get a CloseEnoughTimeline by using the same spell on another Mord-Sith (thus, undoing the first casting).
* In ''Series/TheWorstYearOfMyLifeAgain'', Alex finds himself reliving the previous year, and he knows what's going to happen to him. Downplayed - he specifically says that he doesn’t perfectly remember ''everything'' that happened the first time around.
* In the ''Series/PowerRangersTimeForce'' episode "The Legend of the Clock Tower", Wes tells Katie the story of Walter, the man who built the clock tower, and how he was too timid to stand up for the woman he loved, resulting in him living his life all alone. After seeing Walter's ghost, Katie is pulled back in time, and helps Walter win his love's affections. She then wakes up in her bed, leaving her to wonder if it was AllJustADream. But when she reminds Wes of the original story, he insists that he told her it happened the way she caused it to, and that Walter lived happily with his love.
* ''Series/TheFlash2014'':
** In "Out of Time", Barry accidentally goes so fast that he goes back in time to one day in the past. At first Barry is the only person who remembers the events of "Out of Time", until "The Trap" when it is revealed that [[spoiler: Cisco]] has dreams about the AlternateTimeline [[spoiler: in which Harrison Wells kills him. In the season finale it's further revealed that the reason why Cisco remembers this is because he is a metahuman.]]
** As time travel becomes increasingly frequent in the series, Ripple Effect Proof Memory is usually the norm. The one exception is in the Season 3 premiere ''Flashpoint'' in which [[spoiler: Barry gradually starts to lose memories of his original timeline, the more he uses his speed in the Flashpoint timeline. Once the Flashpoint timeline is undone and a new CloseEnoughTimeline is established however, Barry retains his memories of the original Season 1/2 timeline and of the months he spent in the Flashpoint timeline, but doesn't remember the unfamiliar aspects of the new timeline, such as the death of Cisco's brother Dante or the new CSI Julian Albert whom he's supposedly been sharing a lab with for the past year]].
** The Season 3 BigBad Dr. Alchemy has effectively weaponized Ripple Effect Proof Memory. [[spoiler: He has the ability to not only reawaken the memories of people's lives in the alternate Flashpoint timeline, but also restore the metahuman abilities they had in that timeline. This is actually revealed to be Savitar's doing, as Alchemy is merely his conduit to the real world (Savitar is trapped in the Speed Force)]].
** The show has an interesting twist with TheMultiverse. Apparently, changes on one Earth don't propagate to others, even if the timelines intersect at some point. So, when Harry and Jesse return from Earth-2, they also start noticing changes, and Harry immediately realizes the past was changed on Earth-1.
* On ''Series/LegendsOfTomorrow'' the "Legends" exist mostly outside the time stream in their craft and are thus immune to changes that might happen to it. They can thus see such "aberrations" and fix them before they become permanent.
** During a trip to 1987, Martin Stein tells his younger self to make more time for his wife than only being about his work. Stein is soon hit with flashes of a strange woman he worries might be a new love. When he comes home in 2016, he finds the woman is Lilly, his daughter. As far as everyone else (including Barry Allen) is concerned, Lilly has always existed but Stein has no memory of her at all.
** During a crossover, Caitlin Snow sees Stein and Lilly talking, notices how Stein isn't picking up on Lilly's references to the past and realizes something is wrong. Stein reveals the truth and how he intends to "correct" this by finding a way to erase Lilly as she should be. He defends himself on how the woman is a stranger but a horrified Caitlin points out that as far as Lilly herself is concerned, she's a woman not understanding why her loving father that she's always had a close relationship to is freezing her out.
* In ''Series/{{Timeless}}'' the trio who go through time to stop a criminal are immune to changes brought about. Thus, when they return from their first mission, they find that according to history books, the ''Hindenburgh'' was destroyed a day later by "anarchists" (actually, them) and only two people died. Meanwhile, historian Lucy returns home to discover that her comatose mother is alive and well, Lucy is engaged to a man she's never met and her sister Amy was never born.
** When Lucy tries to explain this to Mason, the inventor of the time machine, and their NSA contact, they're confused as her file shows no sister. Lucy shows them a locket with Amy's picture that she'd been wearing during the trip so it still survives. Mason is astounded to realize Lucy has an artifact of a timeline that no longer exists.
** Addressed in another episode when NSA contact Christopher gives Lucy a data file containing photos and videos of Christopher's family to keep in the time ship. Christopher says that she wants to be sure that, should Lucy come back and find Christopher's family no longer exists, some record of them survives.
* In ''Series/{{Frequency}}'' Raimy Sullivan is the only one who sees how the present changes due to her father Frank affecting things in 1996 (the two linked by talking via a ham radio). Raimy remembers the old timeline but now has memories of this new history. However, they're not instant; it takes being told a body has been identified as her mother for Raimy to "remember" her mom vanishing in 1997.
14th Mar '17 9:30:33 AM Ferot_Dreadnaught
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** As time travel becomes increasingly frequent in the series, RippleEffectProofMemory is usually the norm. The one exception is in the Season 3 premiere ''Flashpoint'' in which [[spoiler: Barry gradually starts to lose memories of his original timeline, the more he uses his speed in the Flashpoint timeline. Once the Flashpoint timeline is undone and a new CloseEnoughTimeline is established however, Barry retains his memories of the original Season 1/2 timeline and of the months he spent in the Flashpoint timeline, but doesn't remember the unfamiliar aspects of the new timeline, such as the death of Cisco's brother Dante or the new CSI Julian Albert whom he's supposedly been sharing a lab with for the past year]].
** The Season 3 BigBad Dr. Alchemy has effectively weaponized RippleEffectProofMemory. [[spoiler: He has the ability to not only reawaken the memories of people's lives in the alternate Flashpoint timeline, but also restore the metahuman abilities they had in that timeline. This is actually revealed to be Savitar's doing, as Alchemy is merely his conduit to the real world (Savitar is trapped in the Speed Force)]].

to:

** As time travel becomes increasingly frequent in the series, RippleEffectProofMemory Ripple Effect Proof Memory is usually the norm. The one exception is in the Season 3 premiere ''Flashpoint'' in which [[spoiler: Barry gradually starts to lose memories of his original timeline, the more he uses his speed in the Flashpoint timeline. Once the Flashpoint timeline is undone and a new CloseEnoughTimeline is established however, Barry retains his memories of the original Season 1/2 timeline and of the months he spent in the Flashpoint timeline, but doesn't remember the unfamiliar aspects of the new timeline, such as the death of Cisco's brother Dante or the new CSI Julian Albert whom he's supposedly been sharing a lab with for the past year]].
** The Season 3 BigBad Dr. Alchemy has effectively weaponized RippleEffectProofMemory.Ripple Effect Proof Memory. [[spoiler: He has the ability to not only reawaken the memories of people's lives in the alternate Flashpoint timeline, but also restore the metahuman abilities they had in that timeline. This is actually revealed to be Savitar's doing, as Alchemy is merely his conduit to the real world (Savitar is trapped in the Speed Force)]].



* In ''VideoGame/BravelyDefault'' [[spoiler: the characters appear to have this, as the nature of how they travel between worlds means that they in something of a GroundhogDayLoop situation. The Great Chasm caused by their arrival in a new world opens at exactly the same point in time in every world, and many of the events which happen in the 'first' world of the game are repeated in a similar fashion in later ones, enabling the characters to intervene where possible and use their knowledge to - eventually - avoid needless conflict. D's Journal indicates that the same was true for the world prior to the first, though thanks to his TraumaInducedAmnesia Ringabel's RippleEffectProofMemory is initially not as complete as it should be having experienced one world more than the others. When he does recall his past, it quickly becomes a SpannerInTheWorks for the BigBad.]]

to:

* In ''VideoGame/BravelyDefault'' [[spoiler: the characters appear to have this, as the nature of how they travel between worlds means that they in something of a GroundhogDayLoop situation. The Great Chasm caused by their arrival in a new world opens at exactly the same point in time in every world, and many of the events which happen in the 'first' world of the game are repeated in a similar fashion in later ones, enabling the characters to intervene where possible and use their knowledge to - eventually - avoid needless conflict. D's Journal indicates that the same was true for the world prior to the first, though thanks to his TraumaInducedAmnesia Ringabel's RippleEffectProofMemory Ripple Effect Proof Memory is initially not as complete as it should be having experienced one world more than the others. When he does recall his past, it quickly becomes a SpannerInTheWorks for the BigBad.]]
14th Mar '17 9:28:43 AM ChronoLegion
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Added DiffLines:

* In ''Literature/PastwatchTheRedemptionOfChristopherColumbus'', only the trio of time travelers remember anything of their original reality, in large part because [[spoiler:their reality disappeared the moment they jumped into the past, since history is changed instantly]]. [[spoiler:They do leave a written record of their timeline to the people of the new timeline they create]].
13th Mar '17 12:55:30 PM ChronoLegion
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** The Season 3 BigBad Dr. Alchemy has effectively weaponized RippleEffectProofMemory. [[spoiler: He has the ability to not only reawaken the memories of people's lives in the alternate Flashpoint timeline, but also restore the metahuman abilities they had in that timeline]].

to:

** The Season 3 BigBad Dr. Alchemy has effectively weaponized RippleEffectProofMemory. [[spoiler: He has the ability to not only reawaken the memories of people's lives in the alternate Flashpoint timeline, but also restore the metahuman abilities they had in that timeline]].timeline. This is actually revealed to be Savitar's doing, as Alchemy is merely his conduit to the real world (Savitar is trapped in the Speed Force)]].
** The show has an interesting twist with TheMultiverse. Apparently, changes on one Earth don't propagate to others, even if the timelines intersect at some point. So, when Harry and Jesse return from Earth-2, they also start noticing changes, and Harry immediately realizes the past was changed on Earth-1.
13th Mar '17 12:52:59 PM ChronoLegion
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** As time travel becomes increasingly frequent in the series, RippleEffectProofMemory is usually the norm. The one exception is in the Season 3 premiere ''Flashpoint'' in which [[spoiler: Barry gradually starts to lose memories of his original timeline, the more he uses his speed in the Flashpoint timeline. Once the Flashpoint timeline is undone and a new CloseEnoughTimeline is established however, Barry retains his memories of the original Season 1/2 timeline and of the months he spent in the Flashpoint timeline, but doesn't remember the unfamiliar aspects of the new timeline, such as the death of Cisco's brother Dante or the new CSI Julian Dorn whom he's supposedly been sharing a lab with for the past year]].

to:

** As time travel becomes increasingly frequent in the series, RippleEffectProofMemory is usually the norm. The one exception is in the Season 3 premiere ''Flashpoint'' in which [[spoiler: Barry gradually starts to lose memories of his original timeline, the more he uses his speed in the Flashpoint timeline. Once the Flashpoint timeline is undone and a new CloseEnoughTimeline is established however, Barry retains his memories of the original Season 1/2 timeline and of the months he spent in the Flashpoint timeline, but doesn't remember the unfamiliar aspects of the new timeline, such as the death of Cisco's brother Dante or the new CSI Julian Dorn Albert whom he's supposedly been sharing a lab with for the past year]].
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http://tvtropes.org/pmwiki/article_history.php?article=Main.RippleEffectProofMemory