This movie is an animated film which is based on the cool "Scooby-Doo" TV cartoon. The talented cast includes: Mckenna Grace as Young Daphne (voice), Zac Efron as Fred Jones (voice), Mark Wahlberg as Blue Falcon (voice), Amanda Seyfried as Daphne Blake (voice), Gina Rodriguez as Velma Dinkley (voice), Jason Isaacs as Dick Dastardly (voice), Iain Armitage as Young Shaggy (voice), Ken Jeong as Dynomutt, Dog Wonder (voice), Will Forte as Shaggy Rogers (voice), Frank Welker as Scooby-Doo (voice), Kiersey Clemons as Dee Dee Sykes (voice), Ariana Greenblatt as Young Velma (voice), Tracy Morgan as Captain Caveman (voice) and Pierce Gagnon as Young Fred (voice).