Jonah Hex (Josh Brolin) is the legendary antihero of famous comics and graphic novels, a vagabond with a scarred face who becomes a bounty hunter out of necessity. Jonah's past catches up with him when the U.S. Army makes him an offer: There's a price on his own head - to avoid jail, Jonah must neutralize the evil gang leader Quentin Turnbull (John Malkovich).