Re: Is everything before the destruction of the kelvin exactly the sam But if you always end up going back to an alternate timeline that is practically identical to the one you left, then wouldn't you already exist in that new timeline? You would run into yourself! That is unless "you" in that alternate time line also had gone into the past. In Star Trek IV. When the crew of the Enterprise returns to the future they are obviously coming back to the same timeline they left. We see that because the destruction of the probe is still going on.