In the small town of Granby, Colorado, a master welder named Marvin Heemeyer had had enough. Feeling wronged by those around him, he secretly fortified a bulldozer with 30 tons of concrete and steel, and armed it with multiple guns. On June 4, 2004, Marvin went on a rampage, destroying buildings and causing chaos throughout the town. The police were powerless to stop him, and it would take a tragic turn of events to bring an end to his reign of destruction. What drove Marvin to such extremes, and what were his true motives?

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Some movies that have similar genres and were produced around the same time as Tread include O.J.: Made in America, What Jennifer Did, To Kill a Tiger, Jack the Ripper: London's Most Notorious Killer, Square One, Collective.