Ethical Probe on Mixed Martial Arts Enthusiasts in the USA is an ethicist’s account of the development of mixed martial arts (MMA) as it relates to its prophets and proselytizers, i.e., enthusiasts, who serve as testament to the sport’s corrupt disposition. Profiles on six enthusiasts reveal bizarre—and in some cases nefarious—activities that extend from proto-MMA fads such as the ninja craze of the 1980s.