Get caught up for Sarah Connor Chronicles

[MrBogey]

Sarah Conner was visited by a man sent from the future to protect her by her yet to be born son. The Terminator was sent back by Skynet, which ruled the world because her son, John Conner, would eventually lead humanity against the machines. This was Skynet's last hope.

The man sent back ended up impregnating Sarah and thus became John's dad. He gets killed by the terminator and she raises her son to be a leader. Eventually another terminator shows up but this time it's to protect her from a more advanced model(this one was reprogrammed by John in the future). Sarah decides to destroy Skynet by killing the lead researcher, Miles Dyson. Dyson was working on a piece of the original terminator that survived the first film. He is injured but she convinces him to help her destroy Cyberdyne before they could build Skynet. They succeed and Dyson sacrifices himself to make sure they make it out of Cyberdyne. Ultimately the friendly terminator kills the bad one then gets melted along with Cyberdynes' original terminator pieces.

Then in the third film another friendly terminator shows up to protect a young adult John from another advanced model. He ends up succeeding but Skynet still gets created and nuclear war breaks out. the Chronicles start before the third film though as Sarah had died from cancer.