Charles Lewis founded TapouT in 1997, prompting a whirlwind life that intersected the birth of a sport. Selling TapouT apparel out of the trunk of his car during road trips throughout California, a hot bed of mixed martial arts in the late 1990s, Lewis took on the superhero persona of “Mask" as he donned war paint on his face and wore outlandish comic book outfits. Mask's vision quickly came to represent hardcore aspects of MMA fandom at a time when the sport floundered under political pressure. The history of MMA cannot be told without mentioning Charles “Mask” Lewis, or the era in which he emerged. On March 11, 2009, Lewis was killed by a drunk driver in Newport Beach, Calif. To honor his contributions, the sport's dominant promoter, the Ultimate Fighting Championship (UFC), posthumously inducted "Mask" as the first and only non-fighter into the UFC Hall of Fame.

L’ancien champion de MMA Case Walker garde un profil bas, en gagnant des petits combats régionaux et en refusant de participer à des ligues puissantes qui poussent leurs athlètes vers la prise de drogues pour améliorer leurs performances. Néanmoins, Walker est convaincu par un ancien ami, Brody James, de le suivre en Thaïlande et de l’entraîner pour un combat contre l’invaincu et le mortel Caesar Braga. Lorsque Brody est blessé durant l’entraînement, Case est forcé par un puissant promoteur de remplacer son ami dans ce combat épique.