Cletus Darrow was the patriarch of the Darrow family.
He has glasses, white hair and appears to be quite overweight.
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On Halloween night 75 years ago, he was fighting with his family for a mysterious puzzle-piece artifact. An earthquake caused his home to be swallowed up underground, along with him and his entire family.
When an old Danny Darrow remembered back to his time growing up underground, Cletus was the first to die.
Scooby-Doo! Mystery Incorporated