In 2XXX, men and women on the fringes of society fight in the illegal mixed martial arts tournament Metal Punch. For the winner, there is no prize money, but rather the acclaim of the slums and the honor of being named the strongest of the strong. Obsessive and tormented souls join the tournament aiming to achieve this goal: registration is voluntary, the risk is enormous, and the reward is none. Death or the opponent's inability to continue determines the end of the fights. Body modifications are permitted if they are necessary for the person to fight: in other words, fighting with prosthetics instead of limbs is allowed; this rule has encouraged the gathering of all kinds of cripples with bionic limbs who think they have an advantage just because they are half made of metal. Bobby, Pablo, Rena, Eric. Who in the tournament will manage to defeat their demons? Who will find meaning and purpose? Who will become the strongest of the strong? In this struggle among the poor, the mad, and the desperate, only one will have what it takes to throw the Metal Punch.