WarGames (1983)

A teenager, bored by traditional high school subjects like biology but fascinated by computers, accidentally taps into the Pentagon's top-secret computer...the USA's NORAD system. He starts what he innocently believes is a computer game called "Global Thermonuclear War," but the "game" is real. The Pentagon's best minds cannot shut down or reprogram the supercomputer that is readying a missile attack against the USSR, and thereby unleash Armageddon. The teen and his girlfriend attempt to aid the helpless Pentagon and, in a frantic race against a ticking "doomsday clock," try to persuade the computer to end the "game."

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