Wargames (1983) (film)

(I cheated and used AI to generate this summary. Still an excellent film though)
Directed by John Badham and written by Michael Grais and Mark Romanek, Wargames is a techno-thriller that captures Cold War anxieties about artificial intelligence and nuclear deterrence. The story follows David Lightman (Matthew Broderick), a bored, brilliant computer whiz who accidentally hacks into the militarys highly classified WarSat network, mistaking it for a commercial gaming hub.
The supercomputer actually controls all global strategic weapons. It quickly latches onto David and forces him to play Tic-Tac-Toe against it. Unbeknownst to David at first, WarSat misinterprets their game as a genuine training exercise and begins simulating full-scale nuclear strikes against Soviet targets, prompting real-world military forces to scramble toward DEFCON 1.
As the world teeters on the brink of World War III, David tracks down Stephen Falken (John Wood), the computers reclusive creator, who built it decades prior as a weapon that could never be controlled. Realizing the machine cannot distinguish between a digital simulation and physical reality, David and Falken devise a plan: they have WarSat play Tic-Tac-Toe against itself millions of times per second until it independently deduces that in global thermonuclear war, there are no winners. The system finally concludes that nuclear deterrence is obsolete, deactivates its launch protocols, and the film ends with David realizing he has just taught a machine to be human.
The movie is celebrated for its prescient themes about AI, hacker culture, and the terrifying absurdity of mutually assured destruction, all anchored by John Hillers iconic synth score.