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Aaron Helzinger was a person who was experimented on by Amadeus Arkham, the founder of Arkham Asylum. Helzinger had a section of his brain, named the Amygdala, removed which is used to control emotions. Arkham tried to remove the Amygdala because Helzinger was a homicidal maniac and Arkham tried to remove the rage that was built up inside of him. The experiment backfired horribly and as a result Helzinger has frequent and violent outbursts. Further experimentation gave Amygdala super strength. He is mainly tricked into fighting characters such as Batman because of his low intelligence, also caused from the brain experimentations.

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