History Main / NeverTheSelvesShallMeet

29th Apr '17 11:23:28 AM nombretomado
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* The Franchise/StarWarsExpandedUniverse novel ''[[Literature/TheThrawnTrilogy The Last Command]]'' by TimothyZahn has a variant of this trope, involving [[CloningBlues clones]] instead of time travel. Clones grown near others set up "resonance effects" in the Force, which can drive them insane, and when Luke encounters his clone, he finds the experience incredibly off-putting: there's a buzzing hum in the Force that makes it hard to concentrate or think, making it difficult to fight the clone. This only seems to affect clones whose growth has been accelerated to an extreme degree -- having them grow up in under a year, for instance -- and Force-sensitive clones, since the clone army in the prequels (who take about 10 years to grow up) doesn't have any problems with this. Thrawn figures out a way around it in the same novel, using lizards that can push away the Force to protect against the clone madness ''and'' dramatically decrease the time to grow them even further.

to:

* The Franchise/StarWarsExpandedUniverse novel ''[[Literature/TheThrawnTrilogy The Last Command]]'' by TimothyZahn Creator/TimothyZahn has a variant of this trope, involving [[CloningBlues clones]] instead of time travel. Clones grown near others set up "resonance effects" in the Force, which can drive them insane, and when Luke encounters his clone, he finds the experience incredibly off-putting: there's a buzzing hum in the Force that makes it hard to concentrate or think, making it difficult to fight the clone. This only seems to affect clones whose growth has been accelerated to an extreme degree -- having them grow up in under a year, for instance -- and Force-sensitive clones, since the clone army in the prequels (who take about 10 years to grow up) doesn't have any problems with this. Thrawn figures out a way around it in the same novel, using lizards that can push away the Force to protect against the clone madness ''and'' dramatically decrease the time to grow them even further.
28th Apr '17 4:49:06 PM SSJMagus
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* In the DCAU, specifically in ''WesternAnimation/JusticeLeague'', this is the explanation used by Vandal Savage for why he doesn't go to the past and stop himself from destroying the world; considering that Vandal Savage is an immortal caveman who has lived out virtually all of human history, that means he effectively can't time travel at all. He specifically says that it's a result of his particular time machine's design rather than an immutable law of the universe. In fact, Batman travels to the future and meets the ''WesternAnimation/BatmanBeyond'' version of himself in a later episode, with no consequences. Admittedly, time outright ''collapsed'' in that episode, so "no consequences" is a bit of a relative term. In the short term, at least, it turned out fine.
** Other than the alterations Vandal wanted to cause, his meeting of his past self didn't seem to cause any major damage.

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* In the DCAU, specifically in ''WesternAnimation/JusticeLeague'', this is the explanation used by the future Vandal Savage for why he doesn't go to the past and stop himself from destroying the world; world in [[Recap/JusticeLeagueS2E19And20Hereafter Hereafter]]; considering that Vandal Savage is an immortal caveman who has lived out virtually all of human history, that means he effectively can't time travel at all. He specifically says that it's a result of his particular time machine's design rather than an immutable law of the universe. In fact, Batman travels to the future and meets the ''WesternAnimation/BatmanBeyond'' version of himself in a later episode, with no consequences. Admittedly, time outright ''collapsed'' in that episode, so "no consequences" is a bit of a relative term. In the short term, at least, it turned out fine.
** Other than For the alterations same reason, in [[Recap/JusticeLeagueS1E24To26TheSavageTime The Savage Time]] the present Vandal wanted Savage was unable to cause, his meeting of go back in time to take over the world. Instead he sent back a laptop informing his past self didn't seem how to cause any major damage.do so.
22nd Apr '17 1:54:12 PM lalalei2001
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* In ''Literature/AllOurYesterdays'', it's claimed that if past selves see their future selves, both will be erased from existence, but it's a lie intended to stall them.
12th Apr '17 8:38:37 PM LadyJaneGrey
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* ''VideoGame/WorldOfWarcraft'' defies this in one quest in Dragonflight where you have to take the [[ArtifactOfDoom Hourglass of Eternity]] to the Bronze Dragon shrine. When you do so, your future self appears and helps you defend it from the Infinite Dragon Flight. How did that happen? The quest giver later tells you to do it again, and this time your ''past'' self appears to help you. (Given how the [[EldritchLocation Bronze Dragon Shrine]] works, it is implied that the second quest was done to intentionally create a StableTimeLoop to send backup for the first quest.)
13th Mar '17 12:54:51 PM AthenaBlue
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* ''Series/TwelveMonkeys'': {{Invoked}} by Cole in the pilot, and played with when he brings both the 2015 and 2043 versions of Cassandra's wristwatch together. [[spoiler: The result is a 'paradox', depicted here as a slowing down of time in the immediate vicinity that affects everyone present except Cole]].
** This becomes a plot point in Season 2, as the Messengers -- the Twelve Monkeys' SuperSoldiers -- hijack the Project Splinter time machine and use it to go back in time to [[spoiler: kill the Primaries (humans who act as {{Cosmic Keystone}}s maintaining time) with weapons made from their own bones, creating {{Reality Breaking Paradox}}es to try and collapse time.]]
* This trope gets smashed into the ground with the character of Martin Summers in ''Series/AshesToAshes''. Then again, in the light of the finale, [[spoiler: whether it ''actually'' applies is debatable]].
* In ''Crime Traveller'' this is one of the rules of time travel. It was never entirely clear what would happen if someone met their past self, but the implication was that it wouldn't be good. Strangely, one of the other rules was that the time travellers needed to be back in the room with the time machine at the moment they left. In theory, this means that they should see themselves leaving and break the first rule but that was never shown to happen.



** ''Mawdryn Undead'' shows that when the Brigadier met his younger self, the resulting "Blinovitch Limitation Effect" had the effect [[spoiler:of giving the younger Brigadier a nervous breakdown, as well as enough PureEnergy to kill a half-dozen previously immortal aliens]]. In terms of the Brigadier, this created a neat StableTimeLoop.
** In [[Recap/DoctorWhoS27E8FathersDay "Father's Day"]], travelling to the same place twice allows Rose to create a TemporalParadox by watching herself save her father from getting killed in car accident while she was still a baby. Later in the same episode, she gives more power to that story's ClockRoaches [[spoiler:by touching her own infant self]]. It's revealed that cleaning up paradoxes without such things happening is part of what the Time Lords did, but now that (for the most part) there ''aren't'' any Time Lords any more, there's no one to prevent such things from happening. This may explain why no flying killer time monkeys appeared during any serial with a title of the form "The [number] Doctors".



** The 2007 special ''Time Crash'' blamed Creator/PeterDavison's Doctor ageing 30 years on temporal weirdness resulting from being in the same room with himself. (This same explanation may be used to justify the relatively minor differences in appearance occurring in multi-Doctor stories in the original series- the biggest of which (besides TheOtherDarrin example of the new First Doctor) was the obviously-older Second Doctor in "The Two Doctors". But then the Franchise/DoctorWhoExpandedUniverse explains the latter, anyway.)
** In "The Big Bang" Amy meets her seven-year-old self ("Amelia"), and touches her a couple of times in sizing her up. Possible FanWank[=s=] include a) Amelia is from an alternate timeline, so they're not technically the same person (apart from anything else, she [[spoiler:vanishes minutes later, so she obviously doesn't grow up to become Amy]]), and b) with the whole Universe toast, save for the Earth and [[spoiler:the TARDIS explosion acting as a substitute Sun]], there are probably no ClockRoaches, and really more pressing matters at hand than a couple of silly old paradoxes. It's also lampshaded later when Amy mentions that she met herself, and Rory responds that, "to be fair, [[spoiler:the universe did blow up"]].
** In "The Girl Who Waited", two Amys (Amies?) met and the problem was being able to save only one. The TARDIS couldn't handle the paradox of two Amys in one time and place.
** ""Time and Space" is a comic relief special where Amy meets herself from a few minutes down the line. The only danger is to Rory ([[GirlOnGirlIsHot risk of hormone-based overload from watching Amy flirt with herself]].)
** One time the "limitation effect" was a ''small spark'' between two of the same Sonic Screwdriver.
** "[[Recap/DoctorWho50thASTheDayOfTheDoctor The Day of the Doctor]]" episode starts with three incarnations of the Doctor meeting up thanks to [[spoiler:the Moment]] opening rips in space-time. The Tenth and Eleventh Doctors meet the War Doctor, a previously-unmentioned incarnation that existed between the Eighth and Ninth Doctors who renounced his name during the Time War. [[spoiler:It's taken UpToEleven at the end, when ''all'' thirteen incarnations meet at a single point in time to put Gallifrey into another dimension, including the as-yet-nonexistent Twelfth Doctor]]. However, it's specifically mentioned that only the Eleventh Doctor ([[spoiler:and the Twelfth]]) would remember this happening, as the events are asynchronous with the timelines of the earlier Doctors.
** In "[[Recap/DoctorWhoS34E4Listen Listen]]", the Doctor tries to get Clara to travel to her childhood, but Clara (who is at the time psychically linked with the TARDIS) gets distracted and travels to her LoveInterest's childhood. The Doctor doesn't yet know that and tells Clara to stay in the TARDIS in order to avoid meeting her past self. Later, [[spoiler:Clara finds out she accidentally traveled to the Doctor's own childhood (as the First Doctor) and created a StableTimeLoop. She demands that the Doctor leave this time and not try to find out where and when they ended up]].
* On another Franchise/{{Whoniverse}} series, ''Series/{{Torchwood}}'':
** The never-aging Captain Jack, [[spoiler:while trapped in 1901, orders himself [[HumanPopsicle cryogenically frozen]] to avoid meeting in the intervening decades before the present,]] and to prevent himself from meeting his [[Recap/DoctorWhoS27E9TheEmptyChild "The Empty Child"]] self in 1941 and [[Series/DoctorWho "Boom Town"]] self in 2006, as well as the version of him that has lived through all this already.
** At the end of "Kiss Kiss Bang Bang," the whole team, having gone back to earlier that day, are told that they must avoid themselves.
** It seems, though, that they're more worried about changing their own history than a TimeCrash resulting from simply being in the same place, since the same person being in the same place has happened so many times safely. If you interfere where you've ''already'' interfered, though, the ClockRoaches will getcha, as seen in the aforementioned DW episode, Father's Day.
* In ''Series/SevenDays'', whenever Parker travels back in time, his younger self, the sphere, and one trip's worth of their alien fuel source vanishes.

to:

** [[Recap/DoctorWhoS20E3MawdrynUndead "Mawdryn Undead"]] shows that when the Brigadier met his younger self, the resulting "Blinovitch Limitation Effect" had the effect [[spoiler:of giving the younger Brigadier a nervous breakdown, as well as enough PureEnergy to kill a half-dozen previously immortal aliens]]. In terms of the Brigadier, this created a neat StableTimeLoop.
** In [[Recap/DoctorWhoS27E8FathersDay "Father's Day"]], travelling to the same place twice allows Rose to create a TemporalParadox by watching herself save her father from getting killed in car accident while she was still a baby. Later in the same episode, she gives more power to that story's ClockRoaches [[spoiler:by touching her own infant self]]. It's revealed that cleaning up paradoxes without such things happening is part of what the Time Lords did, but now that (for the most part) there ''aren't'' any Time Lords any more, there's no one to prevent such things from happening. This may explain why no flying killer time monkeys appeared during any serial with a title of the form "The [number] Doctors".
** The 2007 special ''Time Crash'' [[Recap/DoctorWho2007CiNSTimeCrash "Time Crash"]] blamed Creator/PeterDavison's Doctor ageing 30 years on temporal weirdness resulting from being in the same room with himself. (This same explanation may be used to justify the relatively minor differences in appearance occurring in multi-Doctor stories in the original series- the biggest of which (besides TheOtherDarrin example of the new First Doctor) was the obviously-older Second Doctor in [[Recap/DoctorWhoS22E4TheTwoDoctors "The Two Doctors".Doctors"]]. But then the Franchise/DoctorWhoExpandedUniverse explains the latter, anyway.)
** [[Recap/DoctorWhoS31E8TheHungryEarth "The Hungry Earth"]]: At the beginning, Amy and Rory see their future selves waving to them from a distant hilltop. Amy wants to go over and meet herself, but the Doctor tells her it's a bad idea, and it doesn't happen.
** In [[Recap/DoctorWhoS31E13TheBigBang "The Big Bang" Bang"]], Amy meets her seven-year-old self ("Amelia"), and touches her a couple of times in sizing her up. Possible FanWank[=s=] include a) Amelia is from an alternate timeline, so they're not technically the same person (apart from anything else, she [[spoiler:vanishes minutes later, so she obviously doesn't grow up to become Amy]]), and b) with the whole Universe toast, save for the Earth and [[spoiler:the TARDIS explosion acting as a substitute Sun]], there are probably no ClockRoaches, and really more pressing matters at hand than a couple of silly old paradoxes. It's also lampshaded later when Amy mentions that she met herself, and Rory responds that, "to be fair, [[spoiler:the universe did blow up"]].
** *** In "The Girl Who Waited", the same episode, the "limitation effect" was a ''small spark'' between two Amys (Amies?) met of the same Sonic Screwdriver.
** [[Recap/DoctorWho2011RNDSSpaceAndTime "Space"
and the problem was being able to save only one. The TARDIS couldn't handle the paradox of two Amys in one time and place.
** ""Time and Space"
"Time"]] is a comic relief special where Amy meets herself from a few minutes down the line. The only danger is to Rory ([[GirlOnGirlIsHot risk of hormone-based overload from watching Amy flirt with herself]].)
** One In [[Recap/DoctorWhoS32E10TheGirlWhoWaited "The Girl Who Waited"]], two Amys (Amies?) met and the problem was being able to save only one. The TARDIS couldn't handle the paradox of two Amys in one time the "limitation effect" was a ''small spark'' between two of the same Sonic Screwdriver.
and place.
** "[[Recap/DoctorWho50thASTheDayOfTheDoctor The [[Recap/DoctorWho50thASTheDayOfTheDoctor "The Day of the Doctor]]" episode Doctor"]] starts with three incarnations of the Doctor meeting up thanks to [[spoiler:the Moment]] opening rips in space-time. The Tenth and Eleventh Doctors meet the War Doctor, a previously-unmentioned incarnation that existed between the Eighth and Ninth Doctors who renounced his name during the Time War. [[spoiler:It's taken UpToEleven at the end, when ''all'' thirteen incarnations meet at a single point in time to put Gallifrey into another dimension, including the as-yet-nonexistent Twelfth Doctor]]. However, it's specifically mentioned that only the Eleventh Doctor ([[spoiler:and the Twelfth]]) would remember this happening, as the events are asynchronous with the timelines of the earlier Doctors.
** In "[[Recap/DoctorWhoS34E4Listen Listen]]", [[Recap/DoctorWhoS34E4Listen "Listen"]], the Doctor tries to get Clara to travel to her childhood, but Clara (who is at the time psychically linked with the TARDIS) gets distracted and travels to her LoveInterest's childhood. The Doctor doesn't yet know that and tells Clara to stay in the TARDIS in order to avoid meeting her past self. Later, [[spoiler:Clara finds out she accidentally traveled to the Doctor's own childhood (as the First Doctor) and created a StableTimeLoop. She demands that the Doctor leave this time and not try to find out where and when they ended up]].
* On another Franchise/{{Whoniverse}} series, ''Series/{{Torchwood}}'':
** The never-aging Captain Jack, [[spoiler:while trapped in 1901, orders himself [[HumanPopsicle cryogenically frozen]] to avoid meeting in
''Series/TheFlash1990'': In the intervening decades episode "Flash Forward", the Flash is bumped ten years into the future by trying to outrun a heat-seeking missile launched at him by Nicholas Pike, to arrive in a world where Central City has been taken over by Pike. When that Flash is sent back in time, he encounters his past self at the point just before the present,]] missile launches and reprograms it to prevent himself from meeting halt its launch, then merges with his [[Recap/DoctorWhoS27E9TheEmptyChild "The Empty Child"]] past self in 1941 to deal with Pike and [[Series/DoctorWho "Boom Town"]] self send him behind bars again.
* ''Series/TheFlash2014'': Averted
in 2006, as well as the version of him that has lived through all this already.
**
episode [[Recap/TheFlash2014S1E23FastEnough ''Fast Enough.'']] [[spoiler: At the end scene of "Kiss Kiss Bang Bang," the whole team, having gone back his mom's murder, ''three'' versions of Barry Allen were actually present -- his present self, his future self, and his child self. While Kid!Barry was whisked away too quickly to earlier that day, are told that they must avoid themselves.
** It seems, though, that they're more worried about changing their own history than a TimeCrash resulting from simply being in the same place, since the same person being in the same place has happened so many times safely. If you interfere where you've ''already'' interfered, though, the ClockRoaches will getcha,
recognize either of them as seen in the aforementioned DW episode, Father's Day.
* In ''Series/SevenDays'', whenever Parker
himself, Present!Barry and Future!Barry make eye contact and recognize each other.]] Somehow, this doesn't break reality. Also happens later, when Barry deliberately travels back in time to [[spoiler:get help with the speed equation from Eobard Thawne. At the end of the episode, Past!Flash ends up helping Present!Flash get back home. The season 2 finale ends with Barry traveling back to his mother's murder ''again'', but this time, his younger self, he stops it, causing the sphere, and one trip's worth of their alien fuel source vanishes.Barry from season 1 finale to dissolve into thin air]].



* Creator/{{NBC}}'s ''Series/{{Journeyman}}'' doesn't even bother to explain why you shouldn't be seen by your other self -- it just assumes you already know that. Though the main character is able to have a fistfight with his past self, so it's at least OK as long as your past self doesn't get a good look at you.
** Like ''Film/BackToTheFuture'', this winds up less of a cosmic rule and more of a guideline to prevent paradoxes, since the timeline is ''very'' malleable (case in point, the time he [[spoiler:left a digital camera in the 1980s, which subsequently retconned his own son out of existance]]). But the protagonist is very GenreSavvy from the get-go.
* Averted in ''Series/KamenRiderDenO''. The character Yuuto Sakurai went back in time and recruited his young adult self personally, bringing him to 2007 to become [[SixthRanger Kamen Rider Zeronos]]; the younger Yuuto also has his older self's contract with the [[OurGeniesAreDifferent Imagin]] Deneb, because said contracts are apparently retroactive.
** TheMovie ''I'm Born!!'' zig-zags this trope. TheHero Ryotaro goes back in time and meets himself as a child, the shock of which causes both to faint. Unfortunately, the adult Ryotaro suffers EasyAmnesia, forgetting his contracts with his ally Imagin, meaning he can't become Den-O; however, the retroactive rule means that the the younger Ryotaro ''can'', and at one point transforms into a miniature Den-O. This causes bigger problems later in the series, where the "forgotten" contracts cause the Imagin to seemingly disappear.
*** On the other hand, the film's climax has Yuuto revealing that he "borrowed" Ryotaro from three other points in the timeline (using a powerful sedative to knock them out), which allows all four Den-O Imagin to exist at the same time and help fight the BigBad Gaoh and his minions.
* ''Series/KamenRiderFourze'' gleefully takes a hammer to this trope in the CrossOver film ''Movie Wars Ultimatum''. When Gentaro Kisaragi from five years in the future comes back in time to our present, the '''very first''' thing he does is pull his past self aside (via tackle), say "Hi, me!", and ask to borrow his TransformationTrinket [[spoiler:since he destroyed the future version as a SecretTestOfCharacter for one of his students]]. Present-Gentaro's first reaction is of course utter shock, but after a moment he gladly loans the belt.
* In the outtake "Orchid Orientation Film" from the ''Series/{{Lost}}'' season 3 [=DVDs=], a time travel experiment involving bunnies apparently goes wrong. The scientist shields one of two identical bunnies from the other and shouts, "Don't let them near each other!" The series proper averts the trope, though.
* ''Series/RedDwarf'' does this too, at the end of series 6. The crew's future selves travel back in time to meet them as they are at that point for some repairs. Kryten admonishes the crew to not contact the future Dwarfers to avoid gaining inappropriate knowledge of the future. They watch instead, and despise what they became. The result? 'I say we fight. ... Better dead than smeg.' From the snivelling, whining coward (according to everyone, including himself) Rimmer. Causes a paradox anyway, but that's what they ''wanted'' at that point.
* In ''Series/{{Sanctuary}}'', after [[spoiler:Helen travels back in time to stop Adam from destroying Praxis, she is stuck there and has to take TheSlowPath, while remaining in hiding from anyone who might know her, including her other self]]. It's not stated that physical contact would be disastrous, but [[spoiler:Helen doesn't recall meeting another Helen, so she can't risk being seen]].
* In ''Series/SevenDays'', whenever Parker travels back in time, his younger self, the sphere, and one trip's worth of their alien fuel source vanishes.
* Played with in the ''Series/SoWeird'' episode "Pen Pal". Annie is able to meet herself from a parallel universe without consequence, but only one of them is supposed to exist in that dimension, so they're unstable. When they touch each other, Parallel Annie is destroyed.



* This trope gets smashed into the ground with the character of Martin Summers in ''Series/AshesToAshes''. Then again, in the light of the finale, [[spoiler: whether it ''actually'' applies is debatable]].
* In ''Crime Traveller'' this is one of the rules of time travel. It was never entirely clear what would happen if someone met their past self, but the implication was that it wouldn't be good. Strangely, one of the other rules was that the time travellers needed to be back in the room with the time machine at the moment they left. In theory, this means that they should see themselves leaving and break the first rule but that was never shown to happen.
* Creator/{{NBC}}'s ''{{Journeyman}}'' doesn't even bother to explain why you shouldn't be seen by your other self -- it just assumes you already know that. Though the main character is able to have a fistfight with his past self, so it's at least OK as long as your past self doesn't get a good look at you.
** Like ''Film/BackToTheFuture'', this winds up less of a cosmic rule and more of a guildeline to prevent paradoxes, since the timeline is ''very'' malleable (case in point, the time he [[spoiler:left a digital camera in the 1980s, which subsequently retconned his own son out of existance]]). But the protagonist is very GenreSavvy from the get-go.
* ''Series/RedDwarf'' does this too, at the end of series 6. The crew's future selves travel back in time to meet them as they are at that point for some repairs. Kryten admonishes the crew to not contact the future Dwarfers to avoid gaining inappropriate knowledge of the future. They watch instead, and despise what they became. The result? 'I say we fight. ... Better dead than smeg.' From the snivelling, whining coward (according to everyone, including himself) Rimmer. Causes a paradox anyway, but that's what they ''wanted'' at that point.
* In the outtake "Orchid Orientation Film" from the ''Series/{{Lost}}'' season 3 [=DVDs=], a time travel experiment involving bunnies apparently goes wrong. The scientist shields one of two identical bunnies from the other and shouts, "Don't let them near each other!" The series proper averts the trope, though.



* Played with in the ''Series/SoWeird'' episode "Pen Pal". Annie is able to meet herself from a parallel universe without consequence, but only one of them is supposed to exist in that dimension, so they're unstable. When they touch each other, Parallel Annie is destroyed.
* Averted in ''Series/KamenRiderDenO''. The character Yuuto Sakurai went back in time and recruited his young adult self personally, bringing him to 2007 to become [[SixthRanger Kamen Rider Zeronos]]; the younger Yuuto also has his older self's contract with the [[OurGeniesAreDifferent Imagin]] Deneb, because said contracts are apparently retroactive.
** TheMovie ''I'm Born!!'' zig-zags this trope. TheHero Ryotaro goes back in time and meets himself as a child, the shock of which causes both to faint. Unfortunately, the adult Ryotaro suffers EasyAmnesia, forgetting his contracts with his ally Imagin, meaning he can't become Den-O; however, the retroactive rule means that the the younger Ryotaro ''can'', and at one point transforms into a miniature Den-O. This causes bigger problems later in the series, where the "forgotten" contracts cause the Imagin to seemingly disappear.
*** On the other hand, the film's climax has Yuuto revealing that he "borrowed" Ryotaro from three other points in the timeline (using a powerful sedative to knock them out), which allows all four Den-O Imagin to exist at the same time and help fight the BigBad Gaoh and his minions.
* ''Series/KamenRiderFourze'' gleefully takes a hammer to this trope in the CrossOver film ''Movie Wars Ultimatum''. When Gentaro Kisaragi from five years in the future comes back in time to our present, the '''very first''' thing he does is pull his past self aside (via tackle), say "Hi, me!", and ask to borrow his TransformationTrinket [[spoiler:since he destroyed the future version as a SecretTestOfCharacter for one of his students]]. Present-Gentaro's first reaction is of course utter shock, but after a moment he gladly loans the belt.
* In ''Series/{{Sanctuary}}'', after [[spoiler:Helen travels back in time to stop Adam from destroying Praxis, she is stuck there and has to take TheSlowPath, while remaining in hiding from anyone who might know her, including her other self]]. It's not stated that physical contact would be disastrous, but [[spoiler:Helen doesn't recall meeting another Helen, so she can't risk being seen]].
* ''Series/TwelveMonkeys'': {{Invoked}} by Cole in the pilot, and played with when he brings both the 2015 and 2043 versions of Cassandra's wristwatch together. [[spoiler: The result is a 'paradox', depicted here as a slowing down of time in the immediate vicinity that affects everyone present except Cole]].
** This becomes a plot point in Season 2, as the Messengers -- the Twelve Monkeys' SuperSoldiers -- hijack the Project Splinter time machine and use it to go back in time to [[spoiler: kill the Primaries (humans who act as {{Cosmic Keystone}}s maintaining time) with weapons made from their own bones, creating {{Reality Breaking Paradox}}es to try and collapse time.]]
* ''Series/TheFlash1990'': In the episode "Flash Forward", the Flash is bumped ten years into the future by trying to outrun a heat-seeking missile launched at him by Nicholas Pike, to arrive in a world where Central City has been taken over by Pike. When that Flash is sent back in time, he encounters his past self at the point just before the missile launches and reprograms it to halt its launch, then merges with his past self to deal with Pike and send him behind bars again.
* ''Series/TheFlash2014'': Averted in the episode [[Recap/TheFlash2014S1E23FastEnough ''Fast Enough.'']] [[spoiler: At the scene of his mom's murder, ''three'' versions of Barry Allen were actually present -- his present self, his future self, and his child self. While Kid!Barry was whisked away too quickly to recognize either of them as himself, Present!Barry and Future!Barry make eye contact and recognize each other.]] Somehow, this doesn't break reality. Also happens later, when Barry deliberately travels back in time to [[spoiler:get help with the speed equation from Eobard Thawne. At the end of the episode, Past!Flash ends up helping Present!Flash get back home. The season 2 finale ends with Barry traveling back to his mother's murder ''again'', but this time, he stops it, causing the Barry from season 1 finale to dissolve into thin air]].
* One ''Series/TimeCop'' episode has a retired cop from the future use the time machine to try to recover the loot from a criminal he once caught. He ends up taking his past wife hostage, causing his past self to start to approach him. The future cop warns him of the consequences (see the Film section), but the past self is willing to let both of them be disintegrated to protect his wife. This doesn't happen, though.

to:

* Played with in the ''Series/SoWeird'' episode "Pen Pal". Annie is able to meet herself from a parallel universe without consequence, but only one of them is supposed to exist in that dimension, so they're unstable. When they touch each other, Parallel Annie is destroyed.
* Averted in ''Series/KamenRiderDenO''. The character Yuuto Sakurai went back in time and recruited his young adult self personally, bringing him to 2007 to become [[SixthRanger Kamen Rider Zeronos]]; the younger Yuuto also has his older self's contract with the [[OurGeniesAreDifferent Imagin]] Deneb, because said contracts are apparently retroactive.
** TheMovie ''I'm Born!!'' zig-zags this trope. TheHero Ryotaro goes back in time and meets himself as a child, the shock of which causes both to faint. Unfortunately, the adult Ryotaro suffers EasyAmnesia, forgetting his contracts with his ally Imagin, meaning he can't become Den-O; however, the retroactive rule means that the the younger Ryotaro ''can'', and at one point transforms into a miniature Den-O. This causes bigger problems later in the series, where the "forgotten" contracts cause the Imagin to seemingly disappear.
*** On the other hand, the film's climax has Yuuto revealing that he "borrowed" Ryotaro from three other points in the timeline (using a powerful sedative to knock them out), which allows all four Den-O Imagin to exist at the same time and help fight the BigBad Gaoh and his minions.
* ''Series/KamenRiderFourze'' gleefully takes a hammer to this trope in the CrossOver film ''Movie Wars Ultimatum''. When Gentaro Kisaragi from five years in the future comes back in time to our present, the '''very first''' thing he does is pull his past self aside (via tackle), say "Hi, me!", and ask to borrow his TransformationTrinket [[spoiler:since he destroyed the future version as a SecretTestOfCharacter for one of his students]]. Present-Gentaro's first reaction is of course utter shock, but after a moment he gladly loans the belt.
* In ''Series/{{Sanctuary}}'', after [[spoiler:Helen travels back in time to stop Adam from destroying Praxis, she is stuck there and has to take TheSlowPath, while remaining in hiding from anyone who might know her, including her other self]]. It's not stated that physical contact would be disastrous, but [[spoiler:Helen doesn't recall meeting another Helen, so she can't risk being seen]].
* ''Series/TwelveMonkeys'': {{Invoked}} by Cole in the pilot, and played with when he brings both the 2015 and 2043 versions of Cassandra's wristwatch together. [[spoiler: The result is a 'paradox', depicted here as a slowing down of time in the immediate vicinity that affects everyone present except Cole]].
** This becomes a plot point in Season 2, as the Messengers -- the Twelve Monkeys' SuperSoldiers -- hijack the Project Splinter time machine and use it to go back in time to [[spoiler: kill the Primaries (humans who act as {{Cosmic Keystone}}s maintaining time) with weapons made from their own bones, creating {{Reality Breaking Paradox}}es to try and collapse time.]]
* ''Series/TheFlash1990'': In the episode "Flash Forward", the Flash is bumped ten years into the future by trying to outrun a heat-seeking missile launched at him by Nicholas Pike, to arrive in a world where Central City has been taken over by Pike. When that Flash is sent back in time, he encounters his past self at the point just before the missile launches and reprograms it to halt its launch, then merges with his past self to deal with Pike and send him behind bars again.
* ''Series/TheFlash2014'': Averted in the episode [[Recap/TheFlash2014S1E23FastEnough ''Fast Enough.'']] [[spoiler: At the scene of his mom's murder, ''three'' versions of Barry Allen were actually present -- his present self, his future self, and his child self. While Kid!Barry was whisked away too quickly to recognize either of them as himself, Present!Barry and Future!Barry make eye contact and recognize each other.]] Somehow, this doesn't break reality. Also happens later, when Barry deliberately travels back in time to [[spoiler:get help with the speed equation from Eobard Thawne. At the end of the episode, Past!Flash ends up helping Present!Flash get back home. The season 2 finale ends with Barry traveling back to his mother's murder ''again'', but this time, he stops it, causing the Barry from season 1 finale to dissolve into thin air]].
* One ''Series/TimeCop'' ''Series/{{Timecop}}'' episode has a retired cop from the future use the time machine to try to recover the loot from a criminal he once caught. He ends up taking his past wife hostage, causing his past self to start to approach him. The future cop warns him of the consequences (see the Film section), but the past self is willing to let both of them be disintegrated to protect his wife. This doesn't happen, though.though.
* On another Franchise/{{Whoniverse}} series, ''Series/{{Torchwood}}'':
** The never-aging Captain Jack, [[spoiler:while trapped in 1901, orders himself [[HumanPopsicle cryogenically frozen]] to avoid meeting in the intervening decades before the present,]] and to prevent himself from meeting his [[Recap/DoctorWhoS27E9TheEmptyChild "The Empty Child"]] self in 1941 and [[Series/DoctorWho "Boom Town"]] self in 2006, as well as the version of him that has lived through all this already.
** At the end of "Kiss Kiss Bang Bang," the whole team, having gone back to earlier that day, are told that they must avoid themselves.
** It seems, though, that they're more worried about changing their own history than a TimeCrash resulting from simply being in the same place, since the same person being in the same place has happened so many times safely. If you interfere where you've ''already'' interfered, though, the ClockRoaches will getcha, as seen in the aforementioned DW episode, Father's Day.
13th Mar '17 12:47:04 PM AthenaBlue
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* This has, not surprisingly, come up a few times on ''Series/DoctorWho'', though he has had no trouble (usually) meeting past versions of himself.
** The Doctor, while visiting a fascist MirrorUniverse of Earth, claims that if that universe's evil version of the Brigadier were to meet the original it would destroy both universes. [[spoiler:The evil Brigadier wants to force the Doctor to save him from his Earth, which volcanic eruptions would destroy in a matter of minutes.]]
** In "Father's Day", traveling to the same place twice allows Rose to create a TemporalParadox by watching herself save her father from getting killed in car accident while she was still a baby. Later in the same episode, she gives more power to that story's ClockRoaches [[spoiler:by touching her own infant self]]. It's revealed that cleaning up paradoxes without such things happening is part of what the Time Lords did, but now that (for the most part) there ''aren't'' any Time Lords any more, there's no one to prevent such things from happening. This may explain why no flying killer time monkeys appeared during any serial with a title of the form "The [number] Doctors."

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* ''Series/DoctorWho'': This has, not surprisingly, unsurprisingly, come up a few times on ''Series/DoctorWho'', several times, though he has the Doctor's had no trouble (usually) meeting past versions of himself.
** [[Recap/DoctorWhoS7E4Inferno "Inferno"]]: The Doctor, while visiting a fascist MirrorUniverse of Earth, claims that if that universe's evil version of the Brigadier were to meet the original it would destroy both universes. [[spoiler:The evil Brigadier wants to force the Doctor to save him from his Earth, which volcanic eruptions would destroy in a matter of minutes.]]
** In "Father's Day", traveling to the same place twice allows Rose to create a TemporalParadox by watching herself save her father from getting killed in car accident while she was still a baby. Later in the same episode, she gives more power to that story's ClockRoaches [[spoiler:by touching her own infant self]]. It's revealed that cleaning up paradoxes without such things happening is part of what the Time Lords did, but now that (for the most part) there ''aren't'' any Time Lords any more, there's no one to prevent such things from happening. This may explain why no flying killer time monkeys appeared during any serial with a title of the form "The [number] Doctors."
]]


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** In [[Recap/DoctorWhoS27E8FathersDay "Father's Day"]], travelling to the same place twice allows Rose to create a TemporalParadox by watching herself save her father from getting killed in car accident while she was still a baby. Later in the same episode, she gives more power to that story's ClockRoaches [[spoiler:by touching her own infant self]]. It's revealed that cleaning up paradoxes without such things happening is part of what the Time Lords did, but now that (for the most part) there ''aren't'' any Time Lords any more, there's no one to prevent such things from happening. This may explain why no flying killer time monkeys appeared during any serial with a title of the form "The [number] Doctors".
8th Mar '17 3:49:14 PM GlitteringFlowers
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* A non-paradox version of this in ''VideoGame/FireEmblemAwakening'' is the stated reason the [[KidFromTheFuture Kids From The Future]] leave once their present selves are born. The future children don't want to live with their present selves because it would negatively impact their childhoods. Averted for [[spoiler:Lucina]], [[spoiler:Noire]] and [[spoiler: Severa]]: the first is already born and briefly meets her baby self, the second stays with her present self to [[SetRightWhatOnceWentWrong right her extremely complicated relationship with her mother]], and the third ''does'' leave but is said to drop by once in a while to check on her parents. ([[spoiler: Though if ''VideoGame/FireEmblemFates'' is to be believed, she eventually ''does'' leave with Owain and Inigo so they can reach Nohr.]])

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* A non-paradox version of this in ''VideoGame/FireEmblemAwakening'' is the stated reason the [[KidFromTheFuture Kids From The Future]] leave once their present selves are born. The future children born; they don't want to live with their present selves because it would negatively impact their childhoods. Averted for [[spoiler:Lucina]], [[spoiler:Noire]] and [[spoiler: Severa]]: the first is already born and briefly meets her baby self, the second stays with her present self to [[SetRightWhatOnceWentWrong right her extremely complicated relationship with her mother]], and the third ''does'' leave but is said to drop by once in a while to check on her parents. ([[spoiler: Though if ''VideoGame/FireEmblemFates'' is to be believed, she eventually ''does'' leave with Owain and Inigo so they can reach Nohr. ''Then again'', both ''Awakening'' and ''Fates'' have alternate universes within their stories, so it's likely that the Severa of one world left with her Owain and her Inigo, whereas another Severa stayed in Ylisse.]])
7th Mar '17 12:55:18 PM MJaxon
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* Openly defied in ''Film/BillAndTedsExcellentAdventure'', where Bill and Ted encounter and interact with their future selves near the beginning of film and is actually [[{{Foreshadowing}} a plot point in advance]].
1st Mar '17 10:56:48 AM Slothgirl
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** Another fanfic, ''FanFic/OnACrossAndArrow'', instead had dimensional travel replacing time travel. Twilight ended up sending the Mane Six into an alternate dimension where everyone is gender-swapped versions of themselves. She feared that if they met their alternate selves, they would explode or something. [[spoiler: Thankfully, this isn't the case in the slightest.]

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** Another fanfic, ''FanFic/OnACrossAndArrow'', instead had dimensional travel replacing time travel. Twilight ended up sending the Mane Six into an alternate dimension where everyone is gender-swapped versions of themselves. She feared that if they met their alternate selves, they would explode or something. [[spoiler: Thankfully, this isn't the case in the slightest.]]]
1st Mar '17 10:56:47 AM Slothgirl
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** Another fanfic, ''FanFic/OnACrossAndArrow'', instead had dimensional travel replacing time travel. Twilight ended up sending the Mane Six into an alternate dimension where everyone is gender-swapped versions of themselves. She feared that if they met their alternate selves, they would explode or something. [[spoiler: Thankfully, this isn't the case in the slightest.]

to:

** Another fanfic, ''FanFic/OnACrossAndArrow'', instead had dimensional travel replacing time travel. Twilight ended up sending the Mane Six into an alternate dimension where everyone is gender-swapped versions of themselves. She feared that if they met their alternate selves, they would explode or something. [[spoiler: Thankfully, this isn't the case in the slightest.]]]
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http://tvtropes.org/pmwiki/article_history.php?article=Main.NeverTheSelvesShallMeet