Terminator 2: Judgment Day

In 2029, Earth has been ravaged by the war between the malevolent artificial intelligence Skynet and the human resistance. Skynet sends the T-1000 —an advanced, shape-shifting prototype Terminator made of virtually indestructible liquid metal —back in time to kill resistance leader John Connor when he is a child. To protect John, the resistance sends back a reprogrammed T-800 Terminator , a less advanced metal endoskeleton covered in living tissue. In 1995 Los Angeles, John's mother Sarah is incarcerated in Pescadero State Hospital for her violent efforts to prevent " Judgment Day "—the prophesied events of August 29, 1997, when Skynet will gain sentience and, in response to its creators' attempts to deactivate it, incite a nuclear holocaust .

John, living with foster parents, also considers Sarah delusional and resents her efforts to prepare him for his future role. The T-1000 locates John in a shopping mall, but the T-800 intervenes, coming to John's aid and enabling his escape. John calls to warn his foster parents, but the T-800 deduces that the T-1000 has already killed them. Realizing the T-800 is programmed to obey him, John forbids it to kill people and orders it to help him rescue Sarah from the T-1000.

The T-800 and John intercept Sarah as she attempts to escape the hospital. Initially horrified that the T-800 resembles the Terminator sent to kill her in 1984, she joins them and escapes the pursuing T-1000. Sarah uses the T-800's knowledge of the future to learn that a revolutionary microprocessor , being developed by Cyberdyne engineer Miles Dyson , will be crucial to Skynet's creation. Over the course of their journey, Sarah sees the T-800 serving as a friend and father figure to John, who teaches it catchphrases and hand signs while encouraging it to become more human-like.

Sarah plans to escape to Mexico with John, but a nightmare about Judgment Day prompts her to decide to kill Dyson. She attacks him in his home but cannot bring herself to go through with it and relents. John arrives and reconciles with Sarah while the T-800 explains to Dyson the future consequences of his work. Dyson reveals that his research has been reverse engineered from the CPU and severed arm of the 1984 Terminator.

Believing that his work must be destroyed, Dyson helps Sarah, John, and the T-800 break into Cyberdyne, retrieve the CPU and the arm, and set explosives to destroy the lab. The police assault the building and fatally shoot Dyson, but he detonates the explosives as he dies . The T-1000 pursues the surviving trio, cornering them in a steel mill . Sarah and John split up to escape while the T-1000 mangles the T-800 and briefly deactivates it by destroying its power source.

The T-1000 assumes Sarah's appearance and voice to lure out John, but Sarah intervenes and, along with the reactivated T-800, pushes it into a vat of molten steel, where it disintegrates. John also throws the 1984 Terminator's arm and CPU into the vat. The T-800 explains that it must also be destroyed to prevent it from serving as a foundation for Skynet. Despite John's tearful protests, the T-800 persuades him that its destruction is the only way to protect their future.

Sarah, having come to respect the T-800, shakes its hand and lowers it into the vat. The T-800 gives John a thumbs-up as it is incinerated. As Sarah drives down a highway with John, she reflects on her renewed hope for an unknown future, musing that if the T-800 could learn the value of life, so can humanity.