Plot: In 2003, in the Longview State Correctional Facility, the criminal Marcus Wright is on death row, and is convinced by the cancerous Dr. Serena Kogan to donate his body to her research and he accepts. In 2018, after an unsuccessful attack to a Skynet facility, only John Connor survives, but he discovers that Skynet is developing the powerful new model T-800. Out of the blue, Marcus appears naked and with amnesia in the location. Marcus befriends the teenager Kyle Reese and the girl Star who help him to survive the lethal machines and they travel together in a Jeep. Meanwhile the resistance discovers a signal that might turn-off the machines and John offers to test it. When Kyle is captured by a machine and brought to the Skynet headquarters, Marcus decides to help the youngster and heads to Skynet; on the way, he saves Blair Williams who suggests to him that he should meet John Connor first. But Marcus steps on a mine and is submitted to surgery, when a secret about his origins is disclosed.
Alternative Plot: Although Judgment Day has in fact occurred, the future for which John Connor (Christian Bale) was prepared has been partly altered by the appearance of a stranger named Marcus Wright (Sam Worthington). Connor must determine if Wright has been rescued from the past, or sent from the future. As the machines prepare for a final battle, Connor and Wright delve deep into Skynet's heart, uncovering a secret that could lead to the annihilation of mankind.
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