マサ斎藤
Trained at the New Japan Pro-Wrestling (NJPW) dojo, he made his Japanese debut on February 10, 1990, at the NJPW/AJPW Supershow in the Tokyo Dome under his name Koji Kitao, and called himself "Warue", which translated to "bad man" in English, where he defeated Bam Bam Bigelow in a highly anticipated match. In the recurring weeks of that year, Kitao, alongside Masa Saito, Shinya Hashimoto and Riki Choshu, had many encounters with Bigelow, "Dr. Death" Steve Williams and Big Van Vader, feuding with the latter, in which Kitao lost most of their matches. However later that July, he was fired for disrespectful conduct and racism towards Riki Choshu, who was of Zainichi Korean descent. His last match occurred on July 22, defeating Russian amateur wrestler Vladimir Berkovich in both men's last match.