|This needs a stretch.|
Mario was a friend of Antonio.
Mario appeared to have brown eyes, but they were actually green, concealed by red contact lenses.
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The Scooby-Doo Show
He dressed up as the Ghostly Gondolier to steal Antonio's medallion and three others like it, so he could find the lost treasure of Doge Malvolio IV. He didn't want to share it with Antonio, the only other known descendant of the Doge.