Josh Hartnett has lined up for the lead role in “dystopian action-thriller” Gunslinger, set in post-apocalyptic America. He will play Sev, who sets out with his brother Jake to seek revenge for the murder of their parents. Chris Nahon (Blood: The Last Vampire) directs. “This story takes a unique and startling look at what might happen when the lawlessness of the Old West returns…but with better weapons,” said Mark Williams, who is producing with Albert Martinez Martin. Gunslinger is set to shoot in Canada in early 2010.