Dan Marsh is a former professional wrestling referee and wrestler most famous as "Dangerous" Danny Davis of WWE and was a member of an early version of The Hart Foundation. He also competed in the WWE for several years as Mr. X, a masked wrestler. As a referee, Davis showed blatant favoritism toward certain wrestlers, which eventually led to his removal as a referee. He then helped manage The Hart Foundation and began wrestling. He competed at several major WWE events, during which he won a six-man match at WrestleMania III and advanced to the semi-final round at King of the Ring 1987. He was later reinstated as a referee and remained with the company until the mid-1990s.