After two years in one spot Sarah Connor feels the need to move on before they get too comfortable. They move to a new city where John starts school and meets a mysterious girl. However, danger strikes, and Sarah and John are caught in another struggle for their survival. Can they possibly overcome the overwhelming odds they face and fight for the spirit of humanity?

Sarah contacts an old friend to acquire new aliases for herself and John. In the meanwhile, John leaves to meet Sarah's ex-boyfriend, and Cameron manages to find herself a new friend. Also, FBI Agent Ellison discovers that Sarah is alive and that one of his enemies is back.

Sarah visits Miles Dyson's widow to find the creator of Skynet. Sarah is lead to a man named Andy Goode, who used to work with Dyson, and is building a chess-playing computer named "The Turk." John and Cameron try their best to fit in on their first day at a new high school.

While searching for some stolen cargo, John becomes separated from Sarah and Cameron. Meanwhile, Agent Ellison's cuddle investigation leads him to a surprising suspect. Can John prove himself as the great military leader he is supposed to be and stop SkyNet's plans?

Sarah reevaluates the capabilities of her friend Andy's computer after he enters it in a chess competition. During the competition, Sarah meets a stranger with a history similar to hers. Meanwhile, Agent Ellison finds remnants from a past terminator battle. Can Sarah make the right decision to stop the future war...or has the decision already been made for her?

The stranger from last week, fighting for his life and flashing in and out of consciousness, recalls his future life battling the machines in 2027. Meanwhile, Sarah tries to explain the past to Charlie.

Sarah breaks into Agent Ellison's apartment and discovers a file on her from her time at the mental hospital, leading her to Dr. Silberman, a doomsday convert. Meanwhile Cameron signs up for a ballet class and John finds out why his mom escaped the mental hospital. Can Sarah stop the seemingly unstoppable chain of events that endanger the life of her son and the future of mankind?

Derek finds the brain chip from Vick that Cameron had kept. John builds an interface for it and they discover a computerized traffic system is important to Skynet. Sarah decides it must be sabotaged. Meanwhile, Cromartie is checking through school records in search of John. Can John, against all odds, strike down the beginnings of SkyNet and change his fate as the future leader of mankind?

Sarah finds herself in a business transaction with a mysterious business man. Meanwhile, Cromartie closes in on John and Agent Ellison discovers a nemesis at the agency. However, events seem to spin out of control yet again. Will Sarah manage to stop the future war against SkyNet while protecting the life of her son?