James Franco, 32, portrays real-life mountaineer Aron Ralston, who was forced to cut his arm off when he was trapped underneath a boulder in the upcoming bio-pic, 127 Hours. After his Oscar-winning movie Slumdog Millionaire, director Danny Boyle spent his time working on 127 Hours. "The movie is going to be obsessive, and it will be for obsessives. You will want him to cut his arm off by the end," the 53-year-old filmmaker states. 127 Hours is scheduled to have its world premiere at the 35th Annual Toronto International Film Festival (September 9-19, 2010), reports Aceshowbiz.com.