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The Plotter was the disguise of Mr. Scamlin.
He has an elongated white face. as in the painting The Scream, and he wears a top hat. His accomplices look like grave-digging ghouls.
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Powers and abilities
He had several followers armed with digging tools.
Scooby-Doo! (DC Comics)
He wanted real estate that was going to become more valuable when an amusement park developer bought it. (It's A Wonderful Fright)