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Nathaniel Nathaniel, or Nat for short, is the great-uncle of Shaggy Rogers.
Uncle Nat is an older version of Shaggy. As quoted by Fred Jones: "You're the spitting image of Shaggy."
Uncle Nat is a coward like Shaggy and Scooby-Doo. He can be scared easily and loves to eat, like Shaggy does. He doesn't like ghosts.
The New Scooby-Doo Movies
The gang, joined by the Harlem Globetrotters, visited Uncle Nat's Boston home. They saw Revolutionary War ghosts on the way, and someone had put a fake "Bridge Out" sign on Uncle Nat's covered bridge. (The Lochness Mess)