It's the start of a Boo-tiful friendship when Scooby-Doo and Shaggy get up-close-and-spooky with some supernatural siblings in this all-new animated movie! After Shaggy's uncle leaves him a fortune in hidden jewels, Scooby and Scrappy join him for the ultimate scavenger hunt through the trap doors and tunnels of the haunted old Beauregard mansion! Terrified by the ghost of Shaggy's uncle, the gang calls in reinforcements - the wild-and-ectoplasmic Boo Brothers, a phantom family of ghoul-chasing ghosts!