国際プロレス
Returning to Japan in November 1978, Ishikawa wrestled a tour with International Wrestling Enterprise, before returning to AJPW in December 1978. In October 1979, he was sent abroad to Puerto Rico for World Wrestling Council. Under the name Mitsu Ishikawa, he won his first championship, the WWC North American Tag Team Championship with Haru Sonoda. In March 1980, he would briefly return to Amarillo and won the NWA Western States Tag Team Championship with Hugo Savinovich, before Savinovich left the area and was replaced by Sonoda, making Ishikawa a two-time champion.