Frank Welker
Scooby-Doo / Fred Jones / Self

Matthew Lillard
Norville 'Shaggy' Rogers / Self - Voice of "Shaggy"

Grey DeLisle
Daphne Blake / Self - Voice of "Daphne"

Kate Micucci
Velma Dinkley / Self - Voice of "Velma"

Janel Parrish
Janel Parrish - Host

Jerry Beck
Self - Animation Historian and Author

Seth Green
Self - Actor

Monsters Unleashed"

Tom Sito
Self - Animator

Self - Animator

Mary Lynn Rajskub
Producer Bryn

Baron Vaughn
Bram Penobscot - Scooby's Vocal Coach

Casey Kasem
Shaggy Rogers (voice) (archive footage)

Diedrich Bader
Batman - Concerned Citizen (voice)

'Weird Al' Yankovic
Self - Singer

Self - Singer

Self - Singer

Olivia Liang
Olivia Liang - Shaggy's Martial Arts Trainer

Karamo Brown
Costume Designer Carter

Mitch Watson
Self - Showrunner

Self - Showrunner

Cheri Oteri
Lazlo the Mechanic

Brendan Jennings
Arlo Davidsonman - Team Scooby

Vadym Krasnenko
Snow Ghost

Lindsey Alena
Additional Voices (voice)