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as Self - Singer, Songwriter, Accordionist
as Bram Penobscot - Scooby's Vocal Coach
as Arlo Davidsonman - Team Scooby
as Shaggy Rogers (voice) (archive footage)
as Lazlo the Mechanic
as Self - Director and Producer, "The Simpsons"
as Batman - Concerned Citizen (voice)
as Additional Voices (voice)
as Scooby-Doo / Fred Jones / Self
as Daphne Blake / Self - Voice of "Daphne"
as Janel Parrish - Host
as Self - Animation Historian and Author
as Self - Hanna-Barbera Co-Founder (archive footage)
as Costume Designer Carter
as Velma Dinkley / Self - Voice of "Velma"
as Producer Bryn
as Norville 'Shaggy' Rogers / Self - Voice of "Shaggy"
as Self - Showrunner, "Mystery Incorporated"
as Olivia Liang - Shaggy's Martial Arts Trainer
as Self - Actor, "Scooby-Doo 2: Monsters Unleashed"
as Self - Animator, Historian
as Self - Director, "Scoob!" / Showrunner, "Mystery Incorporated"
as Snow Ghost