In Scooby-Doo’s greatest adventure yet, see the never-before told story of how lifelong friends Scooby and Shaggy first met and how they joined forces with young detectives Fred, Velma, and Daphne to form the famous Mystery Inc. Now, with hundreds … Amanda Seyfried, Christina Hendricks, Frank Welker, Mckenna Grace, Gina Rodriguez, Justina Machado, Zac Efron Added on HBO 2022-06-26. Added on Netflix 2023-06-27. Added on Amazon Prime 2023-07-27. Youtube Trailer