Warner Bros. Games has detailed the upcoming Mayhem Collection DLC for LEGO Batman: Legacy of the Dark Knight introducing playable versions of The Joker and Harley Quinn alongside a suite of new missions, free-roam challenges, and character customization options.

Quick Facts

  • New Content: Mayhem Collection DLC and Absolute difficulty update
  • Release Date: September 18, 2026
  • Platforms: PC, PlayStation 5, Xbox Series S/X, Nintendo Switch
  • Key Additions: Playable Joker and Harley Quinn, Arkham story mission, Mayhem Mode, and the Sinister Pack

Playable Characters and Abilities

Unlike previous characters in the roster, The Joker and Harley Quinn bring distinct combat styles and gadgets to the game:

  • The Joker: Employs a fast-paced, agile combat approach using a Boxing Glove and a Paintball Pelter.
  • Harley Quinn: Relies on her signature hammer, a "Fun Gun" that fires bubblegum and confetti, and the ability to summon her pet hyenas, Bud and Lou.

New Story Mission and Mayhem Mode

The DLC centers on an all-new Arkham Asylum breakout story mission where players control the duo as they plan a going-away party for Gotham City. Additionally, Mayhem Mode unleashes the characters in time-limited Mayhem Runs across Gotham City. Players race back to Amusement Mile while pursued by Batman and Robin, earning LEGO studs by smashing landmarks, vehicles, and stores while battling A.R.G.U.S. Agents and Task Force X members like Deathstock, Killer Croc, King Shark, and Deadshot.

Sinister Pack Costumes and Items

The Sinister Pack bundles comic-inspired outfits, vehicle updates, and Batcave customization items, including:

  • Batman: The Batman Who Laughs outfit (Dark Nights: Metal #2 2017)
  • Robin: Robin King outfit (Dark Nights: DM – Legends of the Dark Knights #1 2020)
  • Nightwing: Joker outfit (Nightwing #16 2011)
  • Batgirl: Joker outfit (Jokerized DC Multiverse Action Figure)
  • Jim Gordon: Joker outfit (The Joker: The Man Who Stopped Laughing #9 2022)
  • Catwoman: Joker outfit (Catwoman #65 1993)
  • Talia al Ghul: Joker (Earth-37) outfit (DC Elseworlds series, 1997)
  • Vehicle: Jokermobile (Arkham Trilogy)
  • Batcave Items: Helmet (The Merciless), Joker Fish Aquarium, Barbatos Statue, Snake Clowns, and Long Halloween Pumpkin

Absolute Difficulty Free Update

In conjunction with the DLC release, an enhanced "Absolute" difficulty level launches on September 18 as a free software update for all base game owners. Designed for players seeking a greater challenge than the existing Caped Crusader and Dark Knight options, the setting demands higher skill, awareness, and combat precision.