History Main / OnlyOneMeAllowedRightNow

23rd Apr '16 9:57:09 PM Blazer
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* In the ''VideoGame/SuperRobotWarsZ'' plotline, this trope is the reason why [[Manga/MazingerZ the original Kouji Kabuto]] and the [[Anime/GetterRobo classic Getter Robo team]] can't team up with their ''Anime/ShinMazinger'' and ''Getter Robo Armageddon'' counterparts.
21st Jan '16 7:17:23 PM Pastykake
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In most time travel/cloning/alternate reality stories, one character can have multiple copies of themselves running around in the same time period. Some [[NeverTheSelvesShallMeet might have problems if those copies meet each other]]. Then there are these cases...

Only One Me Allowed Right Now is a case where the universe either flat out denies multiple copies of a character to exist in a same time period, or that either the character and the copies go crazy or the universe [[RealityBreakingParadox starts to break down]], or something bad happens.

Note that this is NOT NeverTheSelvesShallMeet. In that one, you can have millions of copies of a same character running around in the same universe without that much trouble, only they must not meet each other. In this case, even though there are only two copies and they are at opposite ends of the universe, the problem still happens. Not as tightly related to the OneSteveLimit as you might think.

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In most time travel/cloning/alternate reality stories, one character can have multiple copies of themselves him- or herself running around in the same time period. Some [[NeverTheSelvesShallMeet might have problems if those copies meet each other]]. Then there are these cases...

Only One Me Allowed Right Now is a case where the universe either the Universe flat out denies multiple copies of a character to exist in a same time period, or that either the character and the copies go crazy or crazy, the universe Universe [[RealityBreakingParadox starts to break down]], or something else bad happens.

Note that this is NOT NeverTheSelvesShallMeet. In that one, you can have millions of copies of a same character running around in the same universe without that much trouble, only they must not meet each other. In this case, even though there are only two copies and they are at opposite ends of the universe, Universe, the problem still happens. Not as tightly related to the OneSteveLimit as you might think.
25th Dec '15 6:43:01 PM nombretomado
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** Some early SilverAge Franchise/{{Superman}} stories (& one [[JusticeLeagueOfAmerica Justice League]] tale) used the idea that if Superman traveled within his own lifetime the earlier version would take his place in the present. So if Superman traveled to when he was Superbaby, Superbaby would appear in the present while Superman was in the past.

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** Some early SilverAge [[UsefulNotes/TheSilverAgeOfComicBooks Silver Age]] Franchise/{{Superman}} stories (& one [[JusticeLeagueOfAmerica Justice League]] tale) used the idea that if Superman traveled within his own lifetime the earlier version would take his place in the present. So if Superman traveled to when he was Superbaby, Superbaby would appear in the present while Superman was in the past.
19th Dec '15 12:47:25 PM Gamermaster
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* In ''Webcomic/LsEmpire'' you can't time travel to a point where you were already alive (you will be sent back to your time of origin upon birth). Note that this only applies to mechanical time travel, magical time travel doesn't any set rules.

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* In ''Webcomic/LsEmpire'' you can't time travel to a point where you were already alive (you will be sent back to your time of origin upon birth). Note that this only applies to mechanical time travel, magical time travel doesn't have any set rules.
16th Dec '15 10:41:02 AM JoePGuy
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** Normally, time travel doesn't exactly work in the Marvel Universe. If you travel into the past, you end up in the past of a similar but distinct universe (which you might not be able to distinguish at the time). For example, when Rachel Summers (daughter of Jean Grey and Scott Summers) traveled into the past, she ended up in the primary Marvel Universe instead of the offshoot where she was born (where Jean Grey was depowered instead of killed). She didn't realize she wasn't in her own timeline until she saw Jean Grey and Scott Summers had a son... she never had a brother.

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** Normally, time travel doesn't exactly work in the Marvel Universe. If you travel into the past, you end up in the past of a similar but distinct universe (which you might not be able to distinguish at the time). For example, when Rachel Summers (daughter of Jean Grey and Scott Summers) traveled into the past, she ended up in the primary Marvel Universe instead of the offshoot where she was born (where Jean Grey was depowered instead of killed). She didn't realize she wasn't in her own timeline until she saw Jean Grey (well, actually Madelyn Pryor, but [[CloningBlues close enough]]) and Scott Summers had a son... she never had a brother.
22nd Nov '15 3:34:09 AM Morgenthaler
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* Not time-travel related, but early in ''Series/StargateSG1'', when two of the same character from alternate realities met up with one another, there would be negative "feedback" that would kill them if they stayed in the same reality too long.
** Of course, conveniently, when the alternate Sam, Jack, and Teal'c arrive to Ancient Egypt in "Moebius", the original Daniel explains that their counterparts were killed by the Goa'uld. When he asks about his version, they reveals that Teal'c killed him after ''that'' Daniel was implanted with a symbiote.
*** Another convenient example in "The Road Not Taken" has Sam accidentally end up in a parallel world while experimenting with phase-shifting technology behind a force field, while her double from that universe was doing something similar. The accident that threw "our" Sam into the other universe also killed her double.
** This is completely ignored in later episodes featuring multiple versions of the same characters. Namely, an episode ''dozens'' of SG-1s are showing up and stay there for several days with no side effects.
*** That episode gets a Handwave by saying that "entropic cascade failure" doesn't occur when the realities are close enough to each other.

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* Not time-travel related, but early in ''Series/StargateSG1'', when two of the same character from alternate realities met up with one another, there would be negative "feedback" that would kill them if they stayed in the same reality too long.
** Of course, conveniently, when
long. If the alternate Sam, Jack, and Teal'c arrive to Ancient Egypt in "Moebius", plot does requires the original Daniel explains that their counterparts were killed by the Goa'uld. When he asks about his version, they reveals that Teal'c killed him after ''that'' Daniel was implanted main characters to interact with a symbiote.
*** Another convenient example in "The Road Not Taken" has Sam accidentally end up in a parallel world while experimenting with phase-shifting technology behind a force field, while her double from that
another universe was doing something similar. The accident that threw "our" Sam into the other universe also killed her double.
** This is completely ignored
for longer periods, their alternates conventiently turn out to be already dead. When dozens of duplicates cross universes to cooperate in a later episodes featuring multiple versions of the same characters. Namely, an episode ''dozens'' of SG-1s are showing up and stay there for several days with no side effects.
*** That episode
episode, it gets a Handwave {{Handwave}} by saying that "entropic cascade failure" doesn't occur when the realities are close enough to each other.other.
15th Nov '15 2:50:14 PM zarpaulus
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** 3rd Edition solved the problem by making the clone inert, even rotting unless preserved, until the original died and then his soul would instantly transfer to the clone.
15th Nov '15 8:25:30 AM Morgenthaler
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* In the French film ''LesVisiteurs'', an object near a copy of itself (from earlier or later in the time stream) will try to merge with its past and/or future selves. ''Violently''. "Near" isn't precisely defined, but seems to vaguely obey the inverse square law.

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* In the French film ''LesVisiteurs'', ''Film/LesVisiteurs'', an object near a copy of itself (from earlier or later in the time stream) will try to merge with its past and/or future selves. ''Violently''. "Near" isn't precisely defined, but seems to vaguely obey the inverse square law.



* In DeanKoontz's Lightning, the inventors of time traveling discover that the universe has a built-in anti-paradox mechanism, where you simply get bounced back from the time-gate if you are attempting to travel to a time where you're already present (or even might be - one character tries to correct a mistake by traveling to a time a couple of minutes before he last showed up, and the universe doesn't let him).

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* In DeanKoontz's Creator/DeanKoontz's Lightning, the inventors of time traveling discover that the universe has a built-in anti-paradox mechanism, where you simply get bounced back from the time-gate if you are attempting to travel to a time where you're already present (or even might be - one character tries to correct a mistake by traveling to a time a couple of minutes before he last showed up, and the universe doesn't let him).



* In ''{{Animorphs}}'', Ax states that, if you go back in time through a Sario Rip and come up to the exact same time as the moment you went back in the first place, you will be annihilated. However, since a rip can knock you back to while you were still alive, that means that there ''are'' two copies of one person at a time, and the annihilation occurs in place of a stable time loop resulting in only one copy, meaning that the person would go from two to none, instead of one.

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* In ''{{Animorphs}}'', ''Literature/{{Animorphs}}'', Ax states that, if you go back in time through a Sario Rip and come up to the exact same time as the moment you went back in the first place, you will be annihilated. However, since a rip can knock you back to while you were still alive, that means that there ''are'' two copies of one person at a time, and the annihilation occurs in place of a stable time loop resulting in only one copy, meaning that the person would go from two to none, instead of one.



* In the CallahansCrosstimeSaloon series, one of the hard and fast rules of time travel is that a particular person can only exist in one place in one particular instant in time, which means that if a time traveler needs to be somewhere else at that particular moment, he needs to either go to that somewhere else, or jump to another place in time to allow the younger or older self where they need to be. Of course, for some time travelers [[spoiler:like Mike Callahan or Lady Sally]] time travel is instantaneous, so you could excuse yourself to a back room to take care of something, disappear, and reappear after perhaps a minute or less, with no one any the wiser you were gone.

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* In the CallahansCrosstimeSaloon ''Literature/CallahansCrosstimeSaloon'' series, one of the hard and fast rules of time travel is that a particular person can only exist in one place in one particular instant in time, which means that if a time traveler needs to be somewhere else at that particular moment, he needs to either go to that somewhere else, or jump to another place in time to allow the younger or older self where they need to be. Of course, for some time travelers [[spoiler:like Mike Callahan or Lady Sally]] time travel is instantaneous, so you could excuse yourself to a back room to take care of something, disappear, and reappear after perhaps a minute or less, with no one any the wiser you were gone.
4th Nov '15 9:08:53 PM PaulA
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* In a story arc in the ''Manga/AstroBoy'' manga, Astro was accidentally transported back in time to the 20th century and attempted to get home via TheSlowPath. When the day of Astro's original creation rolled around, Dr Tenma's first attempt to activate him failed for no technical reason because the universe couldn't contain two Astros.
11th Oct '15 5:46:35 PM nombretomado
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* In PiersAnthony's Literature/IncarnationsOfImmortality, the rule is, instead, that only three of a person is allowed to exist simultaneously. This mostly comes up in "''Bearing an Hourglass''," as the current Chronos is living concurrently with himself, but backwards, which means he is only allowed to travel to a particular point in his life once and once only.

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* In PiersAnthony's Creator/PiersAnthony's Literature/IncarnationsOfImmortality, the rule is, instead, that only three of a person is allowed to exist simultaneously. This mostly comes up in "''Bearing an Hourglass''," as the current Chronos is living concurrently with himself, but backwards, which means he is only allowed to travel to a particular point in his life once and once only.
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