"There was a war.  A few years from now.  Nuclear war.  The whole thing.  All this … everything ... is gone.  Just gone.  There were survivors. 
Here.  There.  Nobody knew who started it.  It was the Machines… Defense network computer.  New.  Powerful.   Hooked into everything.
Trusted to run it all.   They say It got smart... a new order of intelligence.  Then It saw all people as a threat, not just the ones on the other side. 
Decided our fate in a microsecond...  extermination." 

– Kyle Reese