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From the liner notes

Get ready for the ultimate battle of man vs. bloodthirsty machine in this terrifying Stephen King classic! For three horrifying days, the Earth passes through the tail of a mysterious comet. The skies glow an eerie green as humanity waits to see what the fallout will be. But what they imagine is nothing like the nightmare they find - the comet's magnetic fields cause all of the machines on Earth to suddenly come to life and terrorize their human creators in a horrific killing spree. Now its up to a small group of people trapped in a desolate truckstop to defeat the machines - or be killed by them!