Dr. Byron Meredith was a former psychiatrist at Arkham Asylum. He was infamous for his violent ways of treating his patients. While most doctors feared the madness of The Joker, Meredith and Dr. Harleen Quinzel were the only ones willing to take on the Clown Prince of Crime. While Harleen later went mad with The Joker and became his girlfriend and sidekick; Dr. Meredith opened private practice for the Joker obsessed.
Soon he convinced his patients that it would make the Joker proud to cause chaos in Gotham but in reality he was using the chaos as a diversion so he could kill people who had wronged him. Dressing as the Merrymaker, he became the leader of the gang known as the League of Smiles. When Batman found out about the gang, he located the Merrymaker, interrupting the villain as he was about to murder his ex-wife. When fighting the Merrymaker, the League of Smiles found out that the Merrymaker had been using them they ganged up to beat him.
Later, when brought into custody, Dr. Meredith was deemed insane by the psychiatrist even though he clearly wasn't. He was then taken away to Arkham Asylum where he would become a patient.
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