Josh Hartnett is set to star in GUNSLINGER, a post-apocalyptic revenge tale, reports VARIETY . Harnett's character and his brother seek to murder the gang that slaughtered their parents. BLOOD: THE LAST VAMPIRE's Chris Nahon is the director. Mark Williams and 2B Pictures' Albert Martinez Martin are the producers. SC Films will serve as the sales rep internationally. Production will start in Canada at the beginning of 2010.