sentences:  When Skynet gained self-awareness, humans tried to deactivate it, prompting it to retaliate with a nuclear attack, an event known as Judgment Day.John Connor forms a human resistance against Skynet's machines in the future, which include Terminators, and ultimately leads the resistance to victory.Throughout the film series, Skynet sends various Terminator machines back in time to try to kill Connor to ensure Skynet's victory.