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# History Main / OnlyOneMeAllowedRightNow

11th Nov '17 8:55:42 AM H2SO4
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* In ''WesternAnimation/SamuraiJack'', a person cannot travel to any point in time that you have existed in. This is why Aku has to prevent Jack from travelling back; If Jack gets through, Aku would be unable to follow him even with his own power, and he's existed for a few millennia since he threw Jack forward. [[spoiler:This is best demonstrated when Jack could only return at best seconds ''after'' the moment Aku flung him out, and not at any point in his own lifetime before]].
28th Sep '17 1:11:14 AM PaulA
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* Creator/LEModesittJr's ''Timegod'' series has this as an explicit rule: a timediver cannot superimpose himself or herself in space and time. So if one screws something up, he can't just go back a few minutes and try again.
12th Jul '17 8:47:53 PM Omeganian
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** Merorem from ''TabletopGame/TheGatesOfHell'' can travel in time. If he tries coming too close to his alternate self, he is pushed back and stunned.
6th Jul '17 11:27:25 AM Omeganian
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** Merorem ''TabletopGame/TheGatesOfHell'', can travel in time. If he tries coming too close to his alternate self, he is pushed back and stunned.

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** Merorem ''TabletopGame/TheGatesOfHell'', from ''TabletopGame/TheGatesOfHell'' can travel in time. If he tries coming too close to his alternate self, he is pushed back and stunned.
5th Jul '17 8:51:24 PM Omeganian
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** ''The Gates Of Hell'', a fan written ''TabletopGame/DungeonsAndDragons'' book, features a devil who can travel in time. If he tries coming too close to his alternate self, he is pushed back and stunned.

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** ''The Gates Of Hell'', a fan written ''TabletopGame/DungeonsAndDragons'' book, features a devil who Merorem ''TabletopGame/TheGatesOfHell'', can travel in time. If he tries coming too close to his alternate self, he is pushed back and stunned.
9th Jun '17 1:39:35 PM lillolillo
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* This applied to the Franchise/DCUniverse before the first ComicBook/{{Crisis|on Infinite Earths}}. If a character traveled to a time where he or she already existed, it (the version not belonging to that time) would become an invisible, unheard, ineffectual phantom until it stepped out of that moment in time. Note that back then, even if characters were allowed to "meet themselves" [[HitlersTimeTravelExemptionAct history could ''not'' be changed,]] so it was pointless anyway.

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* This applied to the Franchise/DCUniverse before the first ComicBook/{{Crisis|on Infinite Earths}}.''ComicBook/CrisisOnInfiniteEarths''. If a character traveled to a time where he or she already existed, it (the version not belonging to that time) would become an invisible, unheard, ineffectual phantom until it stepped out of that moment in time. Note that back then, even if characters were allowed to "meet themselves" [[HitlersTimeTravelExemptionAct history could ''not'' be changed,]] so it was pointless anyway.

** Some early [[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.

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** Some early [[UsefulNotes/TheSilverAgeOfComicBooks Silver Age]] Franchise/{{Superman}} stories (& one [[JusticeLeagueOfAmerica [[Franchise/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.past.
** Played for drama in ''ComicBook/WhateverHappenedToTheManOfTomorrow'', when young, teenage Comicbook/{{Supergirl}} visits the present and doesn't understand why she's not intangible. It's because it's after her own death. She asks if the contemporary version of herself is visiting another era and Superman, fighting back tears, confirms that "Supergirl is in the past".

* This happened to Jubilee in an issue of ''{{Wolverine}}'': In her youth, there was an incident where she was in a car with her friends, who suddenly asked her why she momentarily disappeared into thin air. Not remembering doing so, she dismisses it as her friends acting crazy. Years later, she briefly falls into the time portal belonging to Gateway, appearing in her parents' house, at the exact same time she "disappeared" in her friends' car. It is explained that two of her couldn't exist in the same point in time, so her younger self simply vanished until the older version returned to the present.
** 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.

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* This happened to Jubilee Comicbook/{{Jubilee}} in an issue of ''{{Wolverine}}'': ''Comicbook/{{Wolverine}}'': In her youth, there was an incident where she was in a car with her friends, who suddenly asked her why she momentarily disappeared into thin air. Not remembering doing so, she dismisses it as her friends acting crazy. Years later, she briefly falls into the time portal belonging to Gateway, appearing in her parents' house, at the exact same time she "disappeared" in her friends' car. It is explained that two of her couldn't exist in the same point in time, so her younger self simply vanished until the older version returned to the present.
** * 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 Comicbook/RachelSummers (daughter of Jean Grey Comicbook/JeanGrey and [[Comicbook/{{Cyclops}} Scott Summers) 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.
10th Apr '17 12:43:20 PM lillolillo
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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.

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* In the ''VideoGame/SuperRobotWarsZ'' plotline, this trope is the reason why [[Manga/MazingerZ [[Anime/MazingerZ the original Kouji Kabuto]] and the [[Anime/GetterRobo [[Manga/GetterRobo classic Getter Robo team]] can't team up with their ''Anime/ShinMazinger'' and ''Getter Robo Armageddon'' counterparts.
24th Mar '17 1:34:09 AM Tsar673
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* The most important time-travel rule on ''Series/Timeless''. It is impossible to revisit any time-period where another version of the time-traveler exists. This means that time-travelers cannot travel to any point within their own lifetime, or revisit any time-period they have previously traveled to. Its mentioned in the pilot that one attempt to do so resulted in the time-traveler returning mutilated.
22nd Nov '16 7:53:39 PM TheBookWasBetter
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