Character » Sarah Essen appears in 214 issues.
Amygdala is frequent inmate of Arkham Asylum, he has no amygdala resulting in him having inhuman rage and super human strength. He was once a resident in Dick Grayson's apartment building while working at Lockhaven Prison.
The Joker, Clown Prince of Crime, is Batman's arch-nemesis. An agent of chaos known for his malicious plots, wacky gadgets and insidious smile, he has caused Batman more suffering than any other villain he has ever faced. His origin, name, and true motivations remain a mystery.
Professor Powder was a rocket scientist who went over the edge and started using hallucinogenic powders, sneezing powders and home-made bombs to terrorize Gotham City, until he was captured by James Gordon and sent to Arkham Asylum.
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