More than two decades have passed since Sarah Connor prevented Judgment Day, changed the future, and re-wrote the fate of the human race. Dani Ramos (Natalia Reyes) is living a simple life in Mexico City with her brother (Diego Boneta) and father when a highly advanced and deadly new Terminator – a Rev-9 (Gabriel Luna) – travels back through time to hunt and kill her. 

Dani's survival depends on her joining forces with two warriors: Grace (Mackenzie Davis), an enhanced super-soldier from the future, and a battle-hardened Sarah Connor (Linda Hamilton). As the Rev-9 ruthlessly destroys everything and everyone in its path on the hunt for Dani, the three are led to a T-800 (Arnold Schwarzenegger) from Sarah’s past that may be their last best hope.