Shaggy's uncle disappears and leaves Shaggy with a billion dollars, so Shaggy...
Shaggy & Scooby-Doo Get a Clue!
Season 1 Episode 1: Shags to Riches
Shaggy's uncle disappears and leaves Shaggy with a billion dollars, so Shaggy and Scooby-Doo go to the mansion he left for them and start exploring.