Butch Cassidy and the Sundance Kid have given up robbing banks and trains and are now ranch owners, and are waiting to hear from the Governor of Wyoming about a possible pardon. While in Buffalo, Wyoming, to buy supplies, they have an unfortunate encounter with Luther Greeley, an outlaw from a rival gang based at Hole-in-the-Wall, during which Sundance is badly wounded. Butch takes him to the nearby home of a friend to recover. As a worried Butch watches over his injured partner, he thinks back to their first meeting and to the events that led up to their partnership. It all began in the town of Green River, Wyoming, and a chance meeting between them when they were young, then using their names Leroy and Lonzo....