Every version of Terminator 2: Judgment Day — the films & series, compared across media.
Terminator 2: Judgment Day follows a reprogrammed T-800 sent back in time to protect young John Connor and his mother Sarah from a shape-shifting T-1000, while the Connors race to stop the AI network Skynet from triggering nuclear annihilation. That premise — the Connors as hunted survivors bound to each other and to the fate of humanity — carries forward from the 1991 film into a television continuation.
No book source appears among the known versions. The story exists as the 1991 film Terminator 2: Judgment Day and the television series Terminator: The Sarah Connor Chronicles, both original screen works.
There are two versions here: the 1991 film Terminator 2: Judgment Day and the 2008 TV series Terminator: The Sarah Connor Chronicles, which picks up four years after the film's events.
Start with the 1991 film Terminator 2: Judgment Day — the TV series Terminator: The Sarah Connor Chronicles picks up four years after its events, so the film provides essential grounding.