Scooby and the gang have their first musical mystery in “Scooby Doo: Music of the Vampire.” It begins when they take a sing-a-long road trip into bayou country to attend the “Vampire-Palooza Festival” – an outdoor fair dedicated to all … Frank Welker, Mindy Cohn, Grey DeLisle, Matthew Lillard, Obba Babatundé, Jeff Bennett, Julianne Buescher Added on HBO 2022-06-07. Youtube Trailer