Attention Non-Nerds: This post is not for you.
Alright, I just finished watching the season finale of Terminator: Sarah Connor Chronicles. And I’m more than a little bit puzzled. 
Until now, the Terminator universe has seemed to operate under the Novikov self-consistency principle, which is summed up on Lost as “Whatever happened, happened.” Basically, a time traveler cannot change the future because any action he or she takes was always a part of history.
So John Connor was able to send his own father back to conceive him, even though alternative theories of time travel would create a paradox. (how could John Connor send his father back because had he NOT sent him back, he wouldn’t have existed to send him back to begin with…head…spnning)
SPOILER::SPOILER::SPOILER::SPOILER
But then in the finale, John travels to the future and meets Derek. When he tells him his name, Derek’s like “John Connor? Who’s John Connor?”, suggesting that because John traveled to the future, he wasn’t around to lead Tech-Com, so of course Derek doesn’t know him.
If the future is so easily changed, then when Sarah and John destroyed Skynet in 1995, how then would Skynet have existed in the future to send the various terminators back in time to kill John and Sarah after the fact?
Anyway, I guess all shows can’t be as smartly written as Lost. Sigh.
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