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Auto / Launch deskLEGO Batman Mayhem Collection DLC arrives September 18
The Mayhem Collection DLC for LEGO Batman: Legacy of the Dark Knight is scheduled for September 18 on Xbox Series X|S. It adds Joker and Harley Quinn as playable villains, alongside a repeatable Mayhem Mode and a customizable hideout.
The DLC is scheduled to arrive September 18 for Xbox Series X|S.
Its story follows Harleen Quinzel meeting the Joker and includes an Arkham Asylum breakout.
Players can decorate a Funhouse hideout with Joker- and Harley-themed props.
Mayhem Mode uses repeatable, time-limited runs in a locked-down Gotham North Island.

Source: Xbox Wire, 2026-09-14. Read the original announcement
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