If you've been waiting for LEGO Batman: Legacy of the Dark Knight to go full villain mode, a fresh leak suggests that wait won't last much longer. A Reddit post surfaced on r/GamingLeaksAndRumours this week pointing to an upcoming expansion called the Mayhem Collection, and the character list attached to it reads like a Task Force X roster sheet.
Leaked Mayhem Collection roster
What the leak actually says
According to the Reddit leak, the Mayhem Collection DLC is targeting a September 2026 release window. The expansion is reportedly centered around a massive Arkham Asylum breakout, with players able to step into the role of Joker and Harley Quinn as the chaos unfolds across Gotham.
The character list is long. The leak names Deadshot, Captain Boomerang, King Shark, Killer Croc, Katana, Rick Flag, Bronze Tiger, Deathstroke, Javelin, Mongal, Polka Dot Man, ARGUS agents, and various goons tied to Joker and Harley. One name on the list, listed simply as "Lester," has fans speculating it refers to the Electrocutioner, a minor DC villain who fits the Suicide Squad orbit.
That's a substantial roster for a single DLC drop. For context, LEGO Batman: Legacy of the Dark Knight already covers Batman's full origin arc, so a villain-focused expansion would flip the game's tone considerably.
Mayhem mode and what it changes for gameplay
Beyond the character additions, the leak describes a dedicated Mayhem mode where villains gain access to unique destructive abilities. The framing suggests players would be causing the rampage rather than stopping it, which is a meaningful structural shift for a game built around being the Dark Knight.
The community reaction has been notably warm toward some of the deeper cuts on that list. Bronze Tiger and Mongal are not characters who typically get the spotlight in licensed games, and their inclusion, if accurate, signals TT Games is pulling from broader DC source material rather than just the most recognizable film versions of these characters. Fans are also already anticipating the LEGO-style humor potential around Katana, whose deadpan warrior persona translates well into brick comedy.
Joker and Harley lead the breakout
How this fits the game's post-launch trajectory
TT Games has been building out Legacy of the Dark Knight steadily since launch. The game already has active Twitch Drops running, and the all suits and outfits guide has become one of the more-visited resources for players hunting unlockables. A villain-focused expansion fits the pattern of post-launch content that broadens who you can play rather than just adding new levels.
The Suicide Squad angle also makes licensing sense. Task Force X has maintained a consistent presence in DC media, and folding that roster into a LEGO game gives TT Games a ready-made ensemble with built-in character dynamics to riff on.
No official release date or pricing has been announced. If the September 2026 window holds, an official reveal could come as early as this summer. Keep an eye on TT Games' channels, and in the meantime, the LEGO Batman: Legacy of the Dark Knight guides are worth bookmarking if you want to be fully prepared before the Mayhem Collection potentially drops.
