Casey Kasem

Shaggy Rogers (voice) (archive footage)

Frank Welker

Scooby-Doo / Fred Jones (voice) (archive footage)

Mindy Cohn

Velma Dinkley (voice) (archive footage)

Grey DeLisle

Daphne Blake / Dempsey (voice) (archive footage)

Mark Hamill

Emperor Caesar Saladicus (voice) (archive footage)

Daran Norris

Ugo DiRinaldi / Shopkeeper / Zombie (voice) (archive footage)

Tara Strong

Alexandra Viggi (voice) (archive footage)

Nika Futterman

Rutie Banez (voice) (archive footage)

Pat Fraley

Uncle Karl (voice) (archive footage)

Dee Bradley Baker

Crusty McPeet / Keeper (voice) (archive footage)