When a mysterious comet passes close to Earth, machines everywhere suddenly take on murderous minds of their own. Soon, video games, cash machines, drawbridges, and steamrollers all go on a psychotic killing spree of global rebellion. But when the Dixie Boy Truck Stop is held hostage by a mob of homicidal 18-wheelers, human vengeance goes into overdrive. Who made who? And who will survive the final showdown of man vs. bloodthirsty machine?