
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.

as Scooby-Doo / Fred Jones / Self

as Norville 'Shaggy' Rogers / Self - Voice of "Shaggy"

as Daphne Blake / Self - Voice of "Daphne"

as Velma Dinkley / Self - Voice of "Velma"

as Janel Parrish - Host

as Self - Animation Historian and Author

as Self - Director and Producer, "The Simpsons"

as Self - Actor, "Scooby-Doo 2: Monsters Unleashed"

as Self - Director, "Scoob!" / Showrunner, "Mystery Incorporated"

as Self - Animator, Historian

as Self - Hanna-Barbera Co-Founder (archive footage)

as Producer Bryn

as Bram Penobscot - Scooby's Vocal Coach

as Shaggy Rogers (voice) (archive footage)

as Batman - Concerned Citizen (voice)

as Self - Singer, Songwriter, Accordionist

as Olivia Liang - Shaggy's Martial Arts Trainer

as Costume Designer Carter

as Self - Showrunner, "Mystery Incorporated"

as Lazlo the Mechanic

as Arlo Davidsonman - Team Scooby

as Snow Ghost

as Additional Voices (voice)

as Additional Voices (voice)

as Additional Voices (voice)