The Rogue's Gallery
Secret Origins Special Vol 2 1, DC Database
Joker (DC Black Label Edition) by Brian Azzarello Trade Paperback DC COMICS
The Most Shockingly Violent Things Batman Villains Have Ever Done
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List of Batman enemies in other media, Ultimate Pop Culture Wiki
Joker (2008 Graphic Novel), Villains Wiki
Edward Nygma (Batman Forever), Ultimate Pop Culture Wiki
A Villain for Every Era: The Penguin and Riddler Have Come a Long Way - The Ringer
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