# LEGO Batman: Legacy of the Dark Knight DLC announcement > Live situation record from CLSTR: https://clstr.news/situations/lego-batman-legacy-of-the-dark-knight-dlc-announcement > Updated: 2026-08-28T18:06:25.000Z. Sources: 25. Developments: 2. Warner Bros. Games and TT Games announced the ‘Mayhem Collection DLC’ for LEGO Batman: Legacy of the Dark Knight, scheduled for release on September 18, 2026. The expansion will be available on PlayStation 5, Xbox Series X|S, PC, and the Nintendo Switch 2. The DLC introduces playable characters The Joker and Harley Quinn, a new story mission involving an Arkham Asylum breakout, and a ‘Mayhem Mode’ for causing destruction in Gotham City. It also includes the ‘Sinister Pack’, which provides themed outfits inspired by DC Comics lore—such as the ‘Batman Who Laughs’ and ‘Robin King’ outfits—alongside various Batcave items like the Jokermobile and a Joker Fish Aquarium. Recent details clarify that the ‘Sinister Pack’ will also feature Joker-themed costumes for Nightwing, Batgirl, Jim Gordon, Catwoman, and Talia al Ghul, as well as the Barbatos statue. While the expansion is available for separate purchase, it is included for owners of the Deluxe Edition. In addition to the expansion, a free update will launch on the same day, introducing an ‘Absolute’ difficulty mode intended to provide a highly challenging tactical and combat experience. ## Timeline ### 2026-08-28: Lego Batman: Legacy of the Dark Knight to receive Mayhem Collection DLC Lego Batman: Legacy of the Dark Knight will release the Mayhem Collection DLC on September 18, featuring a new story, Mayhem Mode, and various Joker and Harley Quinn-themed content. 8 sources. https://clstr.news/cluster/lego-batman-legacy-of-the-dark-knight-to-receive-mayhem-collection-dlc ### 2026-08-26: Warner Bros. Games announces LEGO Batman DLC and Switch 2 release Warner Bros. Games announced the Mayhem Collection DLC for LEGO Batman: Legacy of the Dark Knight, launching September 18, 2026, featuring playable Joker and Harley Quinn characters. 17 sources. https://clstr.news/cluster/lego-batman-legacy-of-the-dark-knight-receives-new-dlc-and-twitch-drops --- Cite as: LEGO Batman: Legacy of the Dark Knight DLC announcement. CLSTR, https://clstr.news/situations/lego-batman-legacy-of-the-dark-knight-dlc-announcement