In Terminator 2: Judgment Day, the T-800 joins forces with John Connor to protect him from the advanced T-1000, allowing Sarah Connor to take down Skynet and change the future.
Linda Hamilton's twin sister, Leslie Hamilton Gearren, was used as a double in scenes requiring two Sarah Connors, notably the scene where the T-1000, disguised as Sarah, confronts the real Sarah Connor.
Edward Furlong's voice changed during the shoot of Terminator 2: Judgment Day, so some of his lines had to be redubbed in post-production.