During the gamescom Studio livestream, IGN exclusively revealed the trailer for LEGO Batman: Legacy of the Dark Knight Deluxe Edition - Mayhem Collection DLC, which features an exciting look at the new story mission starring Harley Quinn and The Joker, the Mayhem Mode, and the Sinister Pack.
LEGO Batman: Legacy of the Dark Knight's Mayhem Collection DLC will be available to all Deluxe Edition owners for no extra cost on September 18, 2026, which also happens to be the same day the game launches on Nintendo Switch 2.
The big addition in the DLC is that new story mission that stars Harley Quinn and The Joker, which will see the pair working together to "orchestrate a breakout from Arkham Asylum with a going-away party Gotham City won't soon forget."
Harley Quinn will be equipped with her trusty hammer and her Fun Gun loaded with Confetti and Bubblegum, and she'll also be able to summon her beloved hyenas, Bud & Lou. As for The Joker, he'll bring his Paintball Pelter and Boxing Glove to the party alongside a "fast-paced, agile combat style that is focused on speed and mobility." Players will also be able to unlock outfits for Harley Quinn and The Joker that are based on past Batman Media, including The Dark Knight Returns comic book series, Batman: The Animated Series, and more.
Outside of the story, the Mayhem Mode will unleash Harley Quinn and The Joker across Gotham City and task them with time-limited Mayhem Runs. During each run, they will need to make it back to Amusement Mile before time runs out, and they will be chased by Batman and Robin while doing so.
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