The gang goes on a trip to check on Velma's younger sister, Madelyn. She's been studying stage magic at the Whirlen Merlin Magic Academy, where apparently there have been sightings of a giant griffin. The gang decides to investigate. Frank Welker, Matthew Lillard, Mindy Cohn, Grey DeLisle, Danica McKellar, James Patrick Stuart, Crystal Scales Added on HBO 2022-06-07. Youtube Trailer