Amid doubts about his will to win, McGregor trains for a match with a rival. As the bout ends painfully, the fighter faces next steps.

McGregor makes an announcement that has MMA pundits skeptical. Shortly afterward, he starts a brutal weight-cutting routine to take on Dustin Poirier.

A pivotal fight against Donald Cerrone stuns the Las Vegas crowd. Later, when the COVID-19 pandemic shuts down the world, McGregor fears losing momentum.

McGregor returns from a two-year break to face the undefeated Khabib Nurmagomedov. With bad blood boiling over, the stunning outcome sparks mayhem.