Nearly 10 years have passed since Sarah Connor was targeted for termination by a cyborg from the future. Now her son, John, the future leader of the resistance, is the target for a newer, more deadly terminator. Once again, the resistance has managed to send a protector back to attempt to save John and his mother Sarah.
A grieving mother transforms herself into a vigilante following the murders of her husband and daughter, eluding the authorities to deliver her own personal brand of justice.
Just when his time under house arrest is about to end, Scott Lang puts again his freedom at risk to help Hope van Dyne and Dr. Hank Pym dive into the quantum realm and try to accomplish, against time and any chance of success, a very dangerous rescue mission.