Frank Welker
Fred Jones / Scooby-Doo (voice) (26 eps)
Matthew Lillard
Shaggy Rogers (voice) (26 eps)
Grey DeLisle
Daphne Blake (voice) (26 eps)
Kate Micucci
Velma Dinkley (voice) (26 eps)
Mark Hamill
Mark Hamill (voice) (3 eps)
Wanda Sykes
Wanda Sykes (voice) (1 eps)
Billy West
Mr. Peebles (voice) (1 eps)
Ian James Corlett
Sherlock Holmes (voice) (1 eps)
Ricky Gervais
Ricky Gervais (voice) (1 eps)
Rachel Kimsey
Wonder Woman (voice) (1 eps)
Penn Jillette
Penn Jillette (voice) (1 eps)
Teller
Teller (voice) (1 eps)
Phil LaMarr
Madds Markson (voice) (1 eps)
Jaleel White
Steve Urkel / Urkel-Bot (voice) (1 eps)
Jim Gaffigan
Jim Gaffigan (voice) (1 eps)
'Weird Al' Yankovic
"Weird Al" Yankovic (voice) (1 eps)
Sia
Sia (voice) (1 eps)
Kenan Thompson
Kenan Thompson (voice) (1 eps)
Kevin Conroy
Batman (voice) (1 eps)
Steven Weber
Alfred Pennyworth (voice) (1 eps)
Whoopi Goldberg
Whoopi Goldberg (voice) (1 eps)
Charlie Schlatter
The Flash (voice) (1 eps)
George Takei
George Takei (voice) (1 eps)
Halsey
Halsey (voice) (1 eps)
Steve Buscemi
Steve Buscemi (voice) (1 eps)
Jeff Dunham
Jeff Dunham / Walter (voice) (1 eps)
Darci Lynne Farmer
Darci Lynne Farmer / Petunia (voice) (1 eps)
Maddie Ziegler
Maddie Ziegler (voice) (1 eps)
Jeff Foxworthy
Jeff Foxworthy (voice) (1 eps)
Malcolm McDowell
Malcolm McDowell (voice) (1 eps)
Jennifer Hale
Thorn (voice) (1 eps)
Jane Wiedlin
Dusk (voice) (1 eps)
Kimberly Brooks
Luna (voice) (1 eps)
Christian Slater
Christian Slater (voice) (1 eps)
John DiMaggio
Talent Agent / Crazy Karl / Baz Bozzington (voice) (1 eps)