Gunslinger Jonah Hex is appointed by President Ulysses Grant to track down terrorist Quentin Turnbull, a former Confederate officer determined on unleashing hell on earth. Jonah not only secures freedom by accepting this task, he also gets revenge on the man who slayed his wife and child. The U.S. military makes a scarred bounty hunter with warrants on his own head an offer he cannot refuse: in exchange for his freedom, he must stop a terrorist who is ready to unleash Hell on Earth.