Champion Carnival
From 1959 to 1972, the Japan Pro Wrestling Alliance (JWA), run by Rikidōzan, held a tournament called World League (also known as the "World Big League"), which featured both Japanese and foreign professional wrestlers. Rikidōzan himself dominated the annual tournament early on, however, after his death in 1963, the tournament was won six times by Giant Baba and once by Antonio Inoki. JWA folded shortly after both Baba and Inoki left the promotion to create All Japan Pro Wrestling (AJPW) and New Japan Pro-Wrestling (NJPW), respectively. Both men took the concept of World League with them to their new promotions, with Baba creating the "Champion Carnival" in 1973 and Inoki creating the World League in 1974, later renaming it G1 Climax.
Pro Wrestling Zero1
On September 12, 2006, Zero1-Max joined 12 other pro wrestling companies and joined the Global Professional Wrestling Alliance (GPWA), a professional wrestling alliance that fosters an environment of cooperation rather than competition. The alliance also occasionally puts on "Super Shows" where all the promotions send fighters to compete representing their own companies under the GPWA banner. Pro Wrestling Noah's CEO Mitsuharu Misawa was inaugurated as the first Chairman of the new alliance, with Zero1-Max's Yoshiyuki Nakamura announced as the company's President.