Warner Bros. Games and TT Games have detailed the Mayhem Collection DLC for LEGO Batman: Legacy of the Dark Knight, including a Joker and Harley Quinn Arkham mission, Mayhem Mode, and Deluxe Edition bonuses arriving with the Switch 2 launch.
Image: play3.de
Arkham is now the Deluxe Edition question
Warner Bros. Games and TT Games have given LEGO Batman: Legacy of the Dark Knight its first major post-launch hook: the Mayhem Collection DLC, led by a new Arkham Asylum story mission starring The Joker and Harley Quinn. IGN revealed the trailer during its gamescom Studio programming, and the DLC is scheduled for September 18, 2026, the same day the game launches on Nintendo Switch 2.
That date creates the immediate buying question. According to IGN, the Mayhem Collection DLC will be available to all Deluxe Edition owners for no extra cost. Nintendo Life describes it as a paid expansion that is included with the Deluxe Edition, which means the practical distinction for shoppers is clear even if the standalone purchase details are not. If you are buying the standard edition, the sources provided do not list a separate DLC price, an upgrade path, or whether every item can be purchased individually. If you are buying the LEGO Batman deluxe edition, the Mayhem Collection is the advertised extra content arriving at launch on Switch 2 and the same day for existing platforms.
VGChartz reports that LEGO Batman: Legacy of the Dark Knight first released on May 22 for PlayStation 5, Xbox Series X|S, and PC via Steam and the Epic Games Store. The Switch 2 version lands later, on September 18, which turns Nintendo’s launch into a bundled moment: new platform, new villains, new mode, and a Deluxe Edition incentive all moving together.
The Joker and Harley mission changes the camera’s center of gravity
The headline addition is the story mission. Warner Bros. and TT Games describe it, via the materials quoted by Nintendo Everything and IGN, as a playable breakout from Arkham Asylum in which The Joker and Harley Quinn “orchestrate a breakout” with a “going-away party” Gotham will remember. Polygon and Nintendo Life both report that the trailer frames the mission around the origins of Joker and Harley’s relationship, with the pair meeting through therapy sessions at Arkham before the escape.
That is a sharp change in tempo for a Batman game built around pursuit, patrol, gadgets, and hero-team problem solving. The Mayhem Collection turns the player into the spark inside the cell block. Instead of Batman arriving after the alarm goes off, the DLC appears to place players at the moment the alarm begins. Nintendo Life notes that the base game had already drawn comparisons to Rocksteady’s Arkham series, and the DLC’s asylum setting pushes that comparison into the foreground.
The playable pair are not cosmetic swaps, based on IGN’s breakdown. Harley Quinn uses her hammer and a Fun Gun loaded with Confetti and Bubblegum, and she can summon Bud and Lou, her hyenas. The Joker brings a Paintball Pelter and Boxing Glove, with IGN describing his combat style as fast-paced, agile, and focused on speed and mobility. Those details suggest TT Games is using the DLC to alter combat rhythm rather than simply adding two new character models. Harley sounds like a bruiser with crowd-control flavor and assist pressure from summons. Joker sounds built around quick entries, hit-and-run movement, and slapstick gadget payoff.
Mayhem Mode turns Gotham into a timed chase route
The second major piece is Mayhem Mode, which shifts the DLC from a scripted Arkham breakout into repeatable chaos across Gotham City. According to Nintendo Everything and IGN, players control The Joker and Harley Quinn in time-limited Mayhem Runs, earning LEGO studs by smashing landmarks, stores, and vehicles, completing challenges, and returning to Amusement Mile before the clock runs out.
The chase framing matters. Warner’s description, as relayed by IGN, says Batman and Robin are in pursuit during these runs. The opposing force also includes A.R.G.U.S. agents and members of Amanda Waller’s Task Force X, with Deathstroke, Killer Croc, Captain Boomerang, Deadshot, King Shark, Polka-Dot Man, and other DC super-villains named in the source materials. Polygon describes the mode as vehicle-centric time trials, while Nintendo Everything’s description emphasizes destruction, challenges, and combat across the city. Those accounts point toward a mode built around route pressure rather than slow exploration.
For players deciding whether the Mayhem Collection DLC is worth the Deluxe Edition bump, this is the content with the longest tail. A single story mission gives context and spectacle. A timed city mode can become the place where character abilities, vehicle handling, enemy interruptions, and stud routes decide whether the DLC has replay value. The confirmed sources do not list the number of Mayhem Runs, reward tiers, leaderboards, or whether co-op changes the mode’s structure, so the safest read is that Mayhem Mode is a replayable activity, but its depth remains unproven until launch.
The Sinister Pack is built for DC collectors as much as LEGO completionists
The Mayhem Collection also includes the Sinister Pack, a bundle of outfits, one vehicle, and Batcave customization props. Nintendo Everything and IGN list seven suits, one for each of the original playable characters, plus the Jokermobile and five Batcave items.
The suit choices lean heavily into Jokerized and darker DC source material. Batman gets The Batman Who Laughs outfit from Dark Nights: Metal #2, Robin gets the Robin King outfit from Dark Nights: Death Metal, Legends of the Dark Knights #1, Nightwing gets a Joker outfit tied to Nightwing #16, Batgirl gets a Jokerized DC Multiverse action figure look, Jim Gordon gets a Joker outfit from The Joker: The Man Who Stopped Laughing #9, Catwoman gets a Joker outfit from Catwoman #65, and Talia al Ghul gets a Joker Earth-37 outfit from DC Elseworlds. IGN also lists the Jokermobile from the Arkham Trilogy and Batcave props including Helmet of The Merciless, Joker Fish Aquarium, Barbatos Statue, Snake Clowns, and Long Halloween Pumpkin.
This is where the Deluxe Edition pitch becomes clearest for collectors. The story mission and Mayhem Mode add playable structure. The Sinister Pack adds identity, display value, and DC reference density. If you treat LEGO games as completionist checklists, the outfits and Batcave pieces matter. If you only care about main campaign progression, the sources do not indicate that the Sinister Pack changes the base story or adds required progression content.
Switch 2 buyers are getting the cleanest timing, but still have the most to verify
The Switch 2 version is central to this reveal because September 18 is both the game’s Nintendo platform launch and the Mayhem Collection release date. IGN, Nintendo Life, Polygon, and VGChartz all connect the DLC timing to the Switch 2 launch. Nintendo Life also says the Deluxe Edition is available to pre-order on Nintendo’s UK site.
For Switch 2 players, that means the Deluxe Edition decision arrives before the platform’s version has been broadly tested by the public. Nintendo Life’s article explicitly hopes the Switch 2 version “holds up,” while one reader comment in the same page raises a separate retail concern after spotting a “game key card” banner on a UK retailer listing. That comment is not an official publisher statement, so it should be treated as community reaction rather than confirmed packaging policy.
The confirmed guidance is narrower. LEGO Batman: Legacy of the Dark Knight is already available on PS5, Xbox Series X|S, and PC, according to VGChartz and IGN. Switch 2 follows on September 18. The Mayhem Collection DLC launches that same day. Deluxe Edition owners get the DLC at no extra cost, according to IGN. The provided sources do not include Switch 2 performance targets, resolution, frame rate, cartridge details, download size, or whether the DLC is included on physical media. Anyone buying specifically for LEGO Batman Switch 2 should wait for platform-specific technical coverage if performance or physical ownership is the deciding factor.
Standard or Deluxe: who should move now and who should wait
Based on the confirmed contents, the Deluxe Edition makes the most sense for players who want villain-led content on day one, especially on Switch 2. The Mayhem Collection adds a Joker and Harley Quinn story mission, playable abilities and gadgets for both characters, Mayhem Mode, multiple themed costumes, the Jokermobile, and Batcave props. It is the version aimed at players who want the game’s Gotham to feel broader immediately, with Arkham spectacle on one side and timed destruction runs on the other.
The standard edition remains the safer choice for players who only want the main campaign or who are waiting for a standalone LEGO Batman Legacy of the Dark Knight DLC price. Nintendo Life calls the expansion paid, while IGN says Deluxe Edition owners receive it for no extra cost, but none of the provided source material gives a separate price for standard-edition owners. That missing number matters. A Deluxe upgrade can look attractive when the content list is long, but value depends on the price gap and how much time Mayhem Mode actually sustains.
There is one extra launch-day wrinkle outside the paid DLC. IGN reports that an enhanced “Absolute” difficulty level will arrive on September 18 as a free update for all players, requiring greater skill, awareness, and precision. That free addition gives standard-edition owners something new on the same day, even without the Mayhem Collection.
So the clean recommendation is this: buy Deluxe if the Joker and Harley Quinn DLC is a day-one priority, if you care about DC costume references, or if you want the fullest Switch 2 package at launch. Buy standard, or wait, if your interest is mainly the base Batman adventure, if you need Switch 2 performance impressions, or if the unknown standalone DLC price is the detail that decides the purchase.