Will Arnett, Michael Shannon board 'Jonah Hex'

Will Arnett and Michael Shannon have signed on to star in the big-screen adaptation of John Albano and Tony DeZuniga’s graphic novel “Jonah Hex" for Warner Bros.

Jimmy Hayward is directing the film, which also stars Josh Brolin, John Malkovich and Megan Fox. Hex (Brolin) is a bounty hunter and gunslinger with a scarred face.

According to the Hollywood Reporter, Arnett is set to play Union soldier enlisting Hex. Shannon is on-board to play Doc Cross Williams, ringleader of a gladiator circus event.

Arnett's voice can currently be heard on the big screen in "Monsters vs. Aliens." He will also soon star in "G-Force" and "When in Rome."

As for Shannon, he was recently nominated for an Oscar for "Revolutionary Road. He's got two productions coming up soon: "13" and "My Son, My Son, What Have Ye Done."