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)