History Main / OnlyOneMeAllowedRightNow

16th Jul '16 4:12:04 PM ImperialScum
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* In ''Literature/AeonLegionLabyrinth'' when someone time travels, they become the 'original'. That original will override any other instance of that person when in the same time. This makes it impossible to meet yourself since you override your non time traveling self. It could be assumed that bringing another non time traveling version of yourself into the Edge of Time would also erase that instance since they did not time travel first.
8th Jul '16 7:06:21 AM ChronoLegion
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* An alternate reality example in ''Series/EarthFinalConflict''. When Liam and Augur accidentally end up in a parallel world, where humanity is fighting a losing war against the Taelons, they manage to flee back to their own reality with Maiya, a member of LaResistance and Lili's half-sister. On their world, though, Maiya starts experiencing an effect similar to the one in ''Series/StargateSG1'', cause by the presence of her double Isabel. They are told that they must "merge" into one in order to survive. This world's Lili also discovers that her missing father had another family, and that Isabel is her half-sister. When Isabel and Maiya come close, they merge into one body, but, unfortunately, Isabel's personality is gone, leaving only Maiya.
29th May '16 7:12:50 PM Gamermaster
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* ''{{Webcomic/Homestuck}}'': According to Aradia, a future self who travels back from a [[BadFuture doomed timeline]] is doomed to be destroyed by the universe sooner or later.

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* ''{{Webcomic/Homestuck}}'': ''Webcomic/{{Homestuck}}'': According to Aradia, a future self who travels back from a [[BadFuture doomed timeline]] is doomed to be destroyed by the universe sooner or later.



* 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.

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* In ''Webcomic/LsEmpire'' you can't time can only travel to a point where time before you were already alive born (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.
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.

to:

* 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.
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