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.
Not streaming on a subscription service in the US right now.
Starring Frank Welker, Casey Kasem, Grey DeLisle, Mindy Cohn, Lauren Bacall, Tim Curry, Jim Belushi, Wayne Knight, Wallace Shawn, Hayden Panettiere