Mister Hammer appears in 18 issues.
Harleen Quinzel was a psychiatric resident at Arkham Asylum, where she met the incarcerated Joker. Falling in love with her patient, she conspired to break him out of prison and eventually became his lover and loyal sidekick, Harley Quinn.
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.
One of the Abramovici twins who served Penguin in Arkham City.
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