Exclusive: LEGO Batman: Legacy of the Dark Knight Deluxe Edition - Mayhem Collection DLC Trailer Reveals The Joker and Harley Quinn Story Mission and More
The Mayhem Collection DLC for LEGO Batman: Legacy of the Dark Knight has been officially revealed, launching on September 18, 2026. Notably, this free DLC release coincides with the game’s arrival on Nintendo Switch 2, marking a significant platform expansion for the title.
Deluxe Edition owners will receive the Mayhem Collection DLC at no additional cost. The expansion centers on an all-new story mission featuring Harley Quinn and The Joker as playable characters, who team up to orchestrate a daring breakout from Arkham Asylum. According to the official description, the pair’s escape plan involves “a going-away party Gotham City won’t soon forget,” suggesting an action-packed adventure through the iconic DC location.
Beyond the story mission, the DLC introduces Mayhem Mode and the Sinister Pack, though details on these additions remain limited. The content was officially unveiled during the gamescom Studio livestream, with IGN providing exclusive access to the trailer. The September 18 launch date positions this expansion as a key release for Switch 2 owners, offering them significant new content alongside the game’s debut on Nintendo’s new console.