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* Literature/StarTrekDepartmentOfTemporalInvestigations: Since the series wants to create a semi-consistent set of rules for a franchise that has spent decades holding the TimeyWimeyBall, it's a necessity to have both branching and overwriting timelines. The physics of time travel are left deliberately vague (as they are difficult to understand even within the setting), but in general, traveling back in time to making changes will spawn an alternate timeline in superposition with the original. Depending on how things shake out, one may collapse and be overwritten by the other, the practical consequence of which is the inability to SetRightWhatOnceWentWrong for any FishOutOfTemporalWater from that timeline.
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* Literature/StarTrekDepartmentOfTemporalInvestigations: Since the series wants to create a semi-consistent set of rules for a franchise that has spent decades holding the TimeyWimeyBall, it's a necessity to have both branching and overwriting timelines. The physics of time travel are left deliberately vague (as they are difficult to understand even within the setting), but in general, traveling back in time to making make changes will spawn an alternate timeline in superposition with the original. Depending on how things shake out, one may collapse and be overwritten by the other, the practical consequence of which is the inability to SetRightWhatOnceWentWrong for any FishOutOfTemporalWater from that timeline.
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* ''Literature/TheGoldenHamsterSaga'': In ''Freddy's Final Quest'', Signor Goldoni invents a time machine, but determines that because going back and altering history would cause a paradox, and because a human would hardly be able to do anything without altering history, it must be impossible for humans to time travel. He calls it the Goldonian Law of Time Travel. Instead, he sends the hamster Freddy, the cat Sir William, the guinea pigs Enrico and Caruso, and the robotic hamster Tjark back in time because animals have no history or cultural influence.
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* This appears to be the case in ''Series/TheFlash2014''. It's eventually revealed that the show's timeline is not the original one, as [[spoiler:Eobard Thawne]] (AKA the Reverse-Flash) has traveled back in time to try to kill Barry Allen (AKA the Flash) when Barry was little. He fails, as Young!Barry is saved by his future self from the same timeline as the Reverse-Flash. Barry's mother dies instead, his father goes to prison, and Barry is raised by Detective Joe West instead of the Allens. Despite this, he still becomes a forensic scientist but with an interest in anything "weird", given his experiences on the night of his mother's death. In the original timeline, Barry's transformation into the Flash may have indeed been a random accident. In the new version of events, [[spoiler:Dr. Harrison Wells, AKA Eobard Thawne]] deliberately engineers Barry's transformation several years ahead of "schedule", which also results in dozens of other "meta-humans" now roaming the city. When Barry finds out that there is evidence of his future self traveling back in time to that night, he is both excited and dejected, as the fact appears to indicate that he's destined to fail. However, other episodes appear to indicate that time is indeed infinitely mutable, especially when Wells warns Barry to let the events play out exactly as they had after Barry accidentally travels back in time by one day, claiming that averting one disaster will likely cause an even greater one to strike.
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* This appears to be the case in ''Series/TheFlash2014''. It's eventually revealed that the show's timeline is not the original one, as [[spoiler:Eobard Thawne]] (AKA the Reverse-Flash) has traveled back in time to try to kill Barry Allen (AKA the Flash) when Barry was little. He fails, as Young!Barry young Barry is saved by his future self from the same timeline as the Reverse-Flash. Barry's mother dies instead, his father goes to prison, and Barry is raised by Detective Joe West instead of the Allens. Despite this, he still becomes a forensic scientist but with an interest in anything "weird", given his experiences on the night of his mother's death. In the original timeline, Barry's transformation into the Flash may have indeed been a random accident. In the new version of events, [[spoiler:Dr. Harrison Wells, AKA Eobard Thawne]] deliberately engineers Barry's transformation several years ahead of "schedule", which also results in dozens of other "meta-humans" now roaming the city. When Barry finds out that there is evidence of his future self traveling back in time to that night, he is both excited and dejected, as the fact appears to indicate that he's destined to fail. However, other episodes appear to indicate that time is indeed infinitely mutable, especially when Wells warns Barry to let the events play out exactly as they had after Barry accidentally travels back in time by one day, claiming that averting one disaster will likely cause an even greater one to strike.
