A father separates his son from his twin sister at birth to prevent him and the mother from knowing she was born with Down syndrome. Based on the novel by Kim Edwards.
Scooby-Doo and Shaggy must go into the underworld ruled by the Goblin King in order to stop a mortal named The Amazing Krudsky who wants power and is a threat to their pals, Fred, Velma and Daphne.