Will Arnett boards 'Jonah Hex'

Will Arnett and Oscar nominee Michael Shannon have joined the cast of Jonah Hex, says The Hollywood Reporter.

The DC Comics adaptation revolves around a bounty hunter, brutally scarred during the Civil War, who attempts to stop a Southern plantation owner from raising an army of the undead.

Arnett, known predominantly as a comic actor, will play a straight-arrow Union soldier who enlists Hex. Shannon (Revolutionary Road) has been cast as circus group leader Doc Cross Williams.

Josh Brolin, John Malkovich and Megan Fox are already onboard to star in the Jimmy Hayward-directed movie.