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* Physical appearance; clothing.
* History is incomplete.
Dr. Kreitzer was a psychologist at the Catwell Rest Home and Spa.
Dr. Kreitzer is a Caucasian male with white hair.
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Scooby-Doo (DC Comics)
He wanted the Catwell home to be rich so he dressed up as the Ghost of Dr. Nathaniel Catwell so the rest home would get more money from rich patients who would prolong their stay.