Original: Set eleven years after the events of The Terminator , it follows Sarah Connor , her 10-year-old son John , and a reprogrammed Terminator from the future as they defend themselves from a T-1000 and attempt to prevent Judgment Day , a future event in which machines will begin to exterminate humanity .
Simplified: It follows Sarah Connor , her 10-year-old son John , and a helper from the future ( as in the first movie ) , as they try to stop Judgment Day , a day in the future when machines will start to kill all humans .