Magnitude Kishiwada
MO'z started when Magnitude Kishiwada got injured in February 2006 and had to take some time off, but he promised his stablemates in Blood Generation that "a friend" would come and take his place while he recuperated. On March 19, that "friend" turned out to be his old Osaka Pro Wrestling running buddy Gamma. Gamma and the stable's leader CIMA took a dislike to each other almost immediately, and their constant butting of heads prompted CIMA to kick him out of the faction on April 12. However, Gamma would be joined in his departure by Naruki Doi, Masato Yoshino, and the newly recruited Naoki Tanisaki. Doi and Gamma then defeated CIMA and Don Fujii on April 23 in a tag match, winning full rights to the Blood Generation name, but they immediately renounced the name, instead establishing the "Muscle Outlaw'z". Their roster was bolstered when Kishiwada joined them when he returned from his injury, and when Genki Horiguchi defected from Do FIXER on February 4, 2007. Referee Kinta Tamaoka also joined their ranks in May 2006, acting as their own personal referee. He allowed the MO'z members to break the rules and he used fast counts when they pinned their opponents, and he also refused to count pinfalls done to MO'z members and would sometimes even attack opponents.