Doge Malvolio IV

Doge Malvolio IV was an old duke who lived in his palace in Venice.

Physical appearance
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Personality
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Season three
His family treasure was hidden somewhere in Venice underground. Mario took advantage of the Ghostly Gondolier to steal the four medallions to get to the treasure.

Appearances

 * The Scooby-Doo Show
 * 315. A Menace in Venice