After 52 years of solving mysteries, the Scooby gang reunite at Warner Bros. Studios to reminisce about their favorite cases and how they were filmed. But it turns out that the back lot may have its OWN monster problem. Fred, Daphne, Velma, Shaggy, and Scooby-Doo investigate this mystery while celebrating the legacy of the franchise.
Frank Welker
as Scooby-Doo / Fred Jones / Self
Matthew Lillard
as Norville 'Shaggy' Rogers / Self - Voice of "Shaggy"
Grey DeLisle
as Daphne Blake / Self - Voice of "Daphne"
Kate Micucci
as Velma Dinkley / Self - Voice of "Velma"
Janel Parrish
as Janel Parrish - Host
Jerry Beck
as Self - Animation Historian and Author
David Silverman
as Self - Director and Producer, "The Simpsons"
Seth Green
as Self - Actor, "Scooby-Doo 2: Monsters Unleashed"
Tony Cervone
as Self - Director, "Scoob!" / Showrunner, "Mystery Incorporated"
Tom Sito
as Self - Animator, Historian
Joseph Barbera
as Self - Hanna-Barbera Co-Founder (archive footage)
Mary Lynn Rajskub
as Producer Bryn
