Mark Wahlberg, Jason Isaacs join voice cast of Warner Bros' upcoming animated Scooby-Doo film
• .Scoob's voice cast also features Zac Efron (Fred), Amanda Seyfried (Daphne), Gina Rodriguez (Velma), Will Forte (Shaggy), Tracy Morgan (Captain Caveman), Frank Welker (Scooby-Doo) and Kiersey Clemons (Dee Dee Skyes)
