In 2029, John Connor (Jason Clarke), leader of the human resistance movement against the machines, learns that Skynet is planning to attack the movement by targeting him in the past and changing the future timeline. In an effort to ensure his own existence and the survival of the human race, John sends lieutenant Kyle Reese (Jai Courtney) back to protect his mother.

But when Kyle arrives to find Sarah Connor (Emilia Clarke) partnered with a T-800 (Arnold Schwarzenegger) and fending off an unexpected enemy, it seems there is much more at stake than previously thought...