What is the subtitle of the second Terminator film?

The subtitle of the second Terminator film is Judgment Day.

Released in 1991, Terminator 2: Judgment Day follows Sarah Connor, her son John, and a reprogrammed T-800. Their goal is to protect John from a more advanced machine, the T-1000, and prevent the nuclear catastrophe called Judgment Day.

The subtitle refers both to the expected nuclear war and to the broader threat of machines gaining control. The film's story explores whether the future is fixed or can be changed through human action.

Other franchise subtitles are easy to mix up. Terminator 3 is titled Rise of the Machines, the fourth film is Terminator Salvation, and the sixth main film is Terminator: Dark Fate. Judgment Day is specifically the subtitle of the 1991 sequel.