Along with a look at their day to day lives, the film tracks the first fights and early years of the sport, including its roots in Japan, its adaptations and growth in Brazil, and ultimately its development in the U.S. It examines how the sport went from being shunned as barbaric to the popular, celebrity-creating entertainment operation it is today. Through the telling of their experiences, the complete history and culture of MMA is explored in a more expansive way than ever before.