Batman: Legends of the Dark Knight — DC Comics
Issue: #181
Overview An investigation into the death of a computer hacker has led Oracle to a secret cyber-world hidden in the bowels of Gotham. But now more bodies are turning up, and someone who might just be the Joker has turned his attention to Oracle!
Creators: Clem Robins, Lee Loughridge, Dylan Horrocks, Ramon Bachs, Tom Fowler, Jon Holdredge, Javier Rodriguez
Characters: Batman, Barbara Gordon, Mallory Moxon
Story arcs: The Secret City