It is the late 1890s in Wyoming. Butch Cassidy is the charismatic leader of the Wild Bunch, a group of criminals who have pulled off many successful bank and train robberies. His closest companion is the Sundance Kid, a laconic, yet skilled marksman. Returning to their hideout at Hole-in-the-Wall, they learn Butch has been replaced by Harvey Logan as their new leader. Butch quickly reasserts his authority when he defeats his would-be replacement through trickery. They proceed to make plans to rob the Union Pacific Overland Flyer train. By striking the train on both its eastward and westward runs, they will maximize their potential rewards.