Scooby's Laff-A Lympics (1977)

S02E11 A Menace in Venice

The group travels to Venice, Italy, to see their friend Antonio, only to discover he's being tormented by the spirit of his ancestor, the Ghostly Gondoleer. This spectral figure is intent on reclaiming a precious family heirloom—an ancient necklace that Antonio wears around his neck!