That depends, time travel is complicated... Take Back to the Future II for example. In the year 2015, Marty 2015 gives no hint or gesture that he knows Marty 1985 is now in the future. Doesn't he remember? Also why doesn't doc 1985 instantly remember he saw himself aka Doc 1955 helping him setting up the Delorean to let Marty travel back to 1985. Another example why did Jennifer 2015 still freak out when she saw Jennifer 1985. It's understandable that Jennifer 1985 still freaks out, but Jennifer 2015 would have known that she would be there. It seems that it works in dimensions as Doc explained, so if we keep ourselves to that principle. Dean 2014 doesn't remember cause in our dimension (or that of supernatural as we know it) Dean 2009 wasn't in 2014.
Remember Marty proposed to prevent Biff 2015 giving the sports almanac in the future to Biff 1955 in the past. However Doc said that wouldn't work cause then Biff would still be rich, meaning in the current dimension Biff didn't give the almanac to himself, that was in a different dimension, where he does give the almanac to himself. Lol time is a complicated thing.
Remember Marty proposed to prevent Biff 2015 giving the sports almanac in the future to Biff 1955 in the past. However Doc said that wouldn't work cause then Biff would still be rich, meaning in the current dimension Biff didn't give the almanac to himself, that was in a different dimension, where he does give the almanac to himself. Lol time is a complicated thing.
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