An animated documentary that recounts the career of 19th century boxer John L. Sullivan. Using animated characters, the film details Sullivan's rise from barroom brawler to America's first sports celebrity. The film highlights Sullivan's 1889 battle for the Heavyweight Championship of the World, an epic 75-round bout that was covered by the international press despite the fact that it was an illegal bare-knuckle fight. It was the last title bout fought under bare-knuckle rules, marking the turning point in boxing's transition from outlaw entertainment to respectable sport.