The Mystery Inc. gang, headlined by dog detective Scooby-Doo, 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. Spike Brandt and Tony Cervone directs from the teleplay by Alan Burnett and Paul Dini & Misty Lee; Story by Burnett; Based on characters created by Hanna-Barbera Productions. from Hanna-Barbera and Warner Bros. Animation.