Bullet Club
The Wrestle Kingdom 9 undercard featured several matches involving the Bullet Club, which was led by A.J. Styles. The group dominated NJPW for most of 2014, holding all four of its heavyweight championships during the summer. After the NJPW–GFW partnership was forged, GFW head Jeff Jarrett joined the Bullet Club on August 10. On December 7, during a Bullet Club post-match assault on Tomoaki Honma, NJPW veteran tag team Tencozy (Hiroyoshi Tenzan and Satoshi Kojima) stormed into the ring to the aid of Honma, driving the Bullet Club away. They then joined Honma to challenge the stable to a six-man tag team match at Wrestle Kingdom 9. Bad Luck Fale, Yujiro Takahashi and Jeff Jarrett—making his NJPW ring debut—were scheduled to represent the Bullet Club at the event.