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[Supersprynt]

Ok so this has kept me up nights...

So in the first Terminator movie, Kyle Reese comes back from the future, sent by John Connor to protect his mother's life. So Reese sleeps with Sarah Connor and she has a child, John Connor. So how does someone exist prior to sending his father back in time to knock up his mother?

[MaskedMan]

Well you have to think of it as the first time everything has every happened. Before they knew Skynet was going to create these robots or w/e. Kyle Reese hooked up with Sarah Connor back in the 80's, and they had a son, John Connor. Many years pass and it's like 2029, and then all that crap happens and this is when John Connor sends his father Kyle Reese back in time to change the present/future. Kyle reese goes back before Sarah was pregnant and before they met apparently, and knocks her up as 2029 Kyle Reese instead of knocking her up as 1984 Kyle Reese, thus the same results happen apparently, except this time she knows everything that is going to happen, unlike the first time everything happened. 2029 Kyle Reese dies, but 1984 Kyle Reese was never killed, which is why he is able to meet up with John Connor in the future. TADA! (Ok I know there's a paradox loop in the movie, but this is the best way to explain things so you can get some sleep )