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A decade after chemical weapon ''Elvis'' kills 18 soldiers during a test, military scapegoat Andrew gets out of jail and tracks down scientist Richard in Montana -- who shoots him. Andrew manages to tell his friend Tim to get Elvis to safety at a fort 90 miles away. However, if exposed to a temperature higher than 50 degrees, the weapon will go off, so Andrew forces ice-cream-truck driver Arlo to help him transport the device.