A rundown of boxing history built around the sport's smaller-framed greats, the film moves through fighters whose skill outran their size. Sugar Ray Robinson and Sugar Ray Leonard anchor the middleweight and welterweight sections, with Willie Pep and Henry Armstrong representing the featherweight and lightweight eras that came before television made boxing a spectacle. Roberto Duran and Tommy Hearns get segments built around their rivalry-era fights, and the film threads in Muhammad Ali and Joe Louis as heavyweight counterpoints even though the title points at the lighter men. More recent names, Manny Pacquiao, Floyd Mayweather, Amir Khan, and Zab Judah, carry the story into the pay-per-view age, while Wladimir and Vitali Klitschko sit at the far end of the size spectrum the film is otherwise arguing against. It plays as a highlight-driven tribute rather than an investigation, stacking career footage of one fighter after another.