Katsuhiko Nakajima

Katsuhiko Nakajima (中嶋 勝彦, Nakajima Katsuhiko; born March 11, 1988) is a Japanese professional wrestler. He works as a freelancer, predominantly for Gleat and Pro Wrestling Zero1. He is best known for his time in All Japan Pro Wrestling (AJPW) and Pro Wrestling Noah.

Known as the "Mad Wolf" (マッド・ウルフ, Maddo Urufu) and the "Dark Assassin" (闇の暗殺者, Yaminoansatsusha)" (among other nicknames), he is best known for his time in Pro Wrestling Noah. He started his career in Riki Choshu's Fighting World of Japan Pro Wrestling (WJ) promotion before heading to Kensuke Sasaki's Kensuke Office/Diamond Ring dojo and promotion. In AJPW, he is a former World Junior Heavyweight Champion. An accomplished karateka, his style is based upon strong, fast kicks and strikes; his style has been dubbed by Nakajima as "Toukon Style" (闘魂 STYLE, Tōkon sutairu), which was later changed to "XX Style" following a copyright dispute with IGF.