John McCarthy, born on October 12, 1962, is best known as a pioneering figure in the mixed martial arts world, particularly for his role as a referee in the Ultimate Fighting Championship (UFC). However, his contributions to film, especially through the documentary "Once I Was a Champion" (2011), have carved out a niche in the physical media collector community. This documentary not only highlights his multifaceted career but also provides an intimate look at the life of former champion, Bas Rutten, making it a must-have for MMA enthusiasts. Collectors seek out McCarthy's work for its unique intersection of sports and cinema, as well as its significance in chronicling the evolution of MMA. The film's limited edition releases on DVD and Blu-ray have become particularly desirable due to the insights it offers into the sport's history and the personalities that shaped it. For collectors who appreciate the blend of athleticism and storytelling, John McCarthy's contributions are invaluable additions to any home video library.