Check out this awesome and fun video from behind the scenes of Scoob! that shows the voice cast, which comes with Frank Welker as the voice of Scooby-Doo, Zac Efron as Fred, Amanda Seyfried as Daphne, Gina Rodriguez as Velma, and Will Forte as Shaggy. We also get to see Tracy Morgan as Captain Caveman, Kiersey Clemons as Dee Dee Skyes, Jason Isaacs voicing the villain Dick Dastardly, and Ken Jeong as Blue Falcon’s sidekick, Dynomutt. We also get to see Simon Cowell as himself, and Ariana Greenblatt, Mckenna Grace, and Iain Armitage as the young Velma, Daphne, and Shaggy.