In a mind-blowing reveal during the gamescom Studio livestream, IGN dropped the bomb on gamers with an electrifying trailer for the upcoming DLC of LEGO Batman: Legacy of the Dark Knight Deluxe Edition - Mayhem Collection. This epic expansion will hit Deluxe Edition owners at no extra cost on September 18, 2026, synchronizing with the game's launch on Nintendo Switch 2. The centerpiece of this DLC is a thrilling new story mission that puts Harley Quinn and the Joker front and center as they scheme an unforgettable escape from Arkham Asylum, complete with a going-away party Gotham City will never forget! Harley Quinn, armed with her faithful hammer and Fun Gun loaded with Confetti and Bubblegum, is ready to cause chaos alongside her beloved hyenas, Bud and Lou. The Joker brings his Paintball Pelter and Boxing Glove to the table, displaying a lightning-fast combat style that emphasizes speed and agility. The Mayhem Mode lets Harley Quinn and the Joker run amok throughout Gotham City, tackling time-limited Mayhem Runs where they must outmaneuver Batman and Robin while racing back to Amusement Mile before time runs out. In addition to smashing everything in sight and completing challenges, players will engage in battles against A.R.G.U.S. Agents, Amanda Waller's Task Force X members like Deathstroke, Killer Croc, Captain Boomerang, Deadshot, King Shark, Polka-Dot Man, and other infamous DC Super-Villains. The Sinister Pack offers themed outfits inspired by iconic Batman media, such as The Dark Knight Returns comic book series and Batman: The Animated Series. This pack also includes a new vehicle, plus Batcave customization options. Last but not least, an enhanced 'Absolute' difficulty level will be available as a free update for all players on September 18, promising to test even the most skilled gamers with greater combat challenges. LEGO Batman: Legacy of the Dark Knight made its debut on PS5, Xbox Series X/S, and PC back in May 2026, garnering praise for its robust open-world Gotham and trademark Lego slapstick humor. For more information, check out announcements from Opening Night Live and what's to come during the rest of gamescom. Adam Bankhurst, a writer for IGN, shared his insights on this exciting news. Follow him on Twitter @AdamBankhurst, Instagram, and TikTok, and tune in to Talking Disney Magic for more!