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The Phantom of the Dinner Theater was the disguise of an unnamed man who acted for unknown reasons.
Scooby-Doo (DC Comics)
Shaggy and Scooby defeated him by fast-talking him into thinking he was trying out for a movie with "kung-food" fighting. They threw food at him, which he had to catch in his mouth and eat. Once he was overstuffed he was easily captured. (Kung-Food Fightin'!)