The T-800 is a character from the "Terminator" movies. After the war between humanity and Skynet broke out, John Connor first encountered the T-800 Terminator when Skynet send the T-800 to kill John during the attack on one of Skynet's factories. John managed to destroy that T-800. After that, Skynet sent another T-800 back in time to kill his mother, Sarah. That T-800 was destroyed by Sarah and Kyle Reese. Meanwhile, in the future, John captured a T-800, repgrogrammed it and sent it back in time so it could protect his younger self from the T-1000 Terminator. That T-800 eventually destroyed himself to prevent altering history further. Meanwhile, in the future, John captured another T-800, reprogrammed it and sent it back in time to protect his younger self from the T-X Terminatrix. That T-800 sacrificed himself to destroy the T-X. After Skynet was destroyed and the war against the machines ended, all T-800 were shut down by the EMP that destroyed Skynet.
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