The Scooby-Doo Show
Antonio taked the gang to the academy he attends to let his professor explain who the ghostly gondolier is. On the way, he showes them some portraits of his ancestors (minus the one of Doge Malvolio). Velma noted the similarity between them and Antonio, their green eyes. The gang meet Antonio's teacher, Professor Salari who told them the story of the ghostly gondolier.