The series picks up four years after the events of Terminator 2: Judgment Day with John and Sarah Connor hiding from the government. After two years in one place Sarah decides they need a change of scenery. Cameron Phillips, a reprogrammed Terminator sent to protect John, informs them that Judgment Day was not stopped and will take place in 2011.
In the 21st century, a weapon will be invented like no other. This weapon will be powerful, versatile and indestructible. It can't be reasoned with. It can't be bargained with. It will feel no pity. No remorse. No pain. No fear. It will have only one purpose: to return to the present and prevent the future. This weapon will be called...The Terminator.