Ben Arnell used to be a psychiatrist in Arkham Asylum. He tried to approach Joker to find what makes him tick and possibly cure him, but it wasn't long until his mind succumbed to Joker's manipulation.
- Mental Illness: Ben suffers from hallucinations. He believed to still live with his family even though they had already left them.
- 4 Appearances of Benjamin Arnell (Killer Smile)
- 2 Images featuring Benjamin Arnell (Killer Smile)
- Quotations by or about Benjamin Arnell (Killer Smile)
- Character Gallery: Benjamin Arnell (Killer Smile)
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