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The Volcano Demon was the disguise of an unnamed real-estate scammer.
He resembles a red demon with hollowed eyes and sharp teeth.
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Scooby-Doo (DC Comics)
The man was trying to keep valuable fertile land on the south side of the island for himself. He was defeated by Scooby-Doo, who was acting without the rest of the gang after being stranded on the island by accident.