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    I have to disagree. Far and away, it's more common to see time travel as a means or method of altering/restoring the universe Trek operates in. Otherwise, you have to label dozens of stories as fundamentally futile; Star Trek IV, Yesterday's Enterprise(TNG), All Good Things(TNG), City at the Edge of Forever(TOS)… all of them were exercises in futility, because they didn't revert the universe to its previous save state; the time-traveling character(s) simply leave 'actual' Trek universe and create a new one with each time travel event.
    – Stick
    Commented Dec 26, 2013 at 19:37
  • The interfering also caused changes in the past different from the main universe, for example Khan's origins are vastly different from the old movie to the new one... In one he rule most of Earth in the 90's... in the new one he had been in stasis since approximately 1959.. Commented Jan 6, 2014 at 15:19
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    TNG: Parallels showed us that a vast number of parallel universes already exist as Worf travels between the different timelines. Eventually they temporarily merge and hundreds or more versions of the Enterprise appear. Commented Jan 18, 2014 at 22:40
  • They should have explained it more. As written by others, in every instance of time travel in Star Trek until now, alterations of the past overwrote the timeline and the alterations must have been undone by the hero of the day. Why should it be completely different this time? And how should Spock know about it? That he still exists with his memories intact is no proof, this also happends to the heroes who fixed the timeline before. So why does Spock not take a warp capable ship, time warp to the past, anihilate nero, restore the old timeline and timewarp wo his own present in his own timeline?
    – Hothie
    Commented Feb 23, 2015 at 10:58
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    Khan's origins as of STID are meant to be the same as in the original series. He was not said to have been in stasis since 1959. He was said to be 300 years old. There's a difference. He predates the change in the timeline so his origin would not have been changed. Commented Jul 10, 2015 at 22:42