Brock Lesnar was in NJPW.
Brock Lesnar . In 2005 , Lesnar returned to professional wrestling and signed with New Japan Pro-Wrestling ( NJPW ) , where he won the IWGP Heavyweight Championship in his first match . After a contractual dispute with NJPW , he also wrestled as IWGP Heavyweight Champion in the Inoki Genome Federation ( IGF ) . Lesnar is a five-time world champion in WWE , a one-time heavyweight champion in the UFC , a one-time heavyweight champion in NJPW , and a one-time heavyweight wrestling champion in the NCAA , the only person in history to win a championship in each of those organizations .