Real Name: Achilles Milo
Occupation: Villain
Marital Status: Single
Base of Operations: Gotham City
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A renowned chemist who turned to crime, he used a variety of chemical and medical-related schemes to kill Batman involving subjecting Batman to a drug that made him afraid of anything bat-shaped, gassing Batman with a compound that made him lose his will to live, manipulating the werewolf-like Anthony Lupus into doing his bidding, taking control of Arkham Asylum, and attempting to make Batman insane with yet another gas. He was later exposed to chemicals that drove him insane, and he spent some time in Arkham Asylum. Batman consulted him on at least one occasion when he needed chemical expertise given to him by The Joker. After that, Dr. Milo retired from criminal activity.