New Japan Pro-Wrestling (NJPW) and All Elite Wrestling (AEW) jointly hosted the Forbidden Door event on August 24, 2025, at London's O2 Arena. The event featured multiple high-profile matches, including a Lights Out Steel Cage Match marking Hiroshi Tanahashi's final UK bout, where he faced a team including Jon Moxley, Bryan Danielson, Gabe Kidd, and The Young Bucks. Zack Sabre Jr. successfully defended the IWGP World Heavyweight Championship against Nigel McGuinness, while Kyle Fletcher retained the AEW TNT Championship against Hiromu Takahashi. The AEW World Trios Titles were also defended by The Opps against the Bullet Club War Dogs. The event opened with a tag match featuring Yuya Uemura, El Desperado, and Paragon against Don Callis Family and CRU. The Forbidden Door event was broadcast live on pay-per-view and is available for replay. Additionally, NJPW announced upcoming events including Road to Destruction at Korakuen Hall on September 13 and Blue Justice XVI on September 7, featuring a final one-on-one match between Yuji Nagata and Hiroshi Tanahashi. Tickets for these events are available in English. The Forbidden Door weekend also included AEW Collision on August 23 as a lead-up show, with NJPW stars participating. Exclusive merchandise commemorating the event was released through the NJPW Eurostore.