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The ghost was the disguise of a clock store owner.
He is a gray-skinned ghost with red eyes. He also has a red mouth and wears a white coat.
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Scooby-Doo! (DC Comics)
The clock store owner dressed up as the ghost and was stealing jewels. He got away from the gang who find his trail to a cloak shop. The gang easily captured him by founding his costume and the loot in one of the cloaks that he stole.