Frank Dux is a martial artist and former fighter known for his claims of participating in underground fighting tournaments. He gained fame in the 1980s, particularly after the release of the film "Bloodsport," which was inspired by his life and experiences. Dux has also claimed to hold several martial arts records, including the fastest knockout and the most consecutive knockouts. Despite his notoriety, Dux's claims have been met with skepticism and controversy. Many martial arts experts and historians question the validity of his achievements and the existence of the tournaments he describes. His story has sparked debates within the martial arts community, particularly regarding authenticity and the portrayal of martial arts in popular culture, including films like Bloodsport.