Terminator: T2 #1
Follows Terminator 2. In many ways this reminded me of the Sarah Connor Chronicles tv show. No time jumping or friendly terminator though.
The Connors meet up with the man the T800 was based on. And a more organic terminator, called an Infiltrator, is sent back to try to change things by creating Skynet instead of trying to kill the Connors. Even though that is still a mission priority. The Connors take her down, but she has a replacement hidden away for the next book.
Her name was Serena and many of the situations were similar to the T:SCC but John was more charismatic, mature and starting to bear the burden of being mankind’s next savior, instead of being a whiny teen with responsibility issues.