Fred Jones / Scooby-Doo (voice)

Frank Welker

Chris Paul

Chris Paul

Daphne Blake

Grey Griffin

Shaggy Rogers (voice)

Matthew Lillard

Velma Dinkley (voice)

Kate Micucci

Guest Voice

"Weird Al" Yankovic

Voice

Charlie Schlatter

Voice

Jeff Bennett

Voice

Dee Bradley Baker

Himself

George Takei

Voice

Rachel Kimsey

Herself

Wanda Sykes

Voice

Kimberly Brooks

Himself

Ricky Gervais

Jeff Dunham / Walter

Jeff Dunham

Herself

Sia

Themselves

Penn & Teller

Voice

Jeff Foxworthy

Guest Voice

Whoopi Goldberg

Steve Urkel

Jaleel White

Voice

Maddie Ziegler

Voice

Steve Buscemi

Himself

Kenan Thompson

Himself

Mark Hamill

Batman

Kevin Conroy

Himself

Jim Gaffigan

Herself

Halsey

Darci Lynne Farmer / Petunia

Darci Lynne Farmer

Voice

Kari Wahlgren

Voice

John Mariano

Voice

Jennifer Hale

Voice

Jill Talley

Voice

Fred Tatasciore

Voice

Ian James Corlett

Voice

JB Blanc

Voice

Keith Ferguson

Voice

David Kaye

Voice

Kevin Michael Richardson

Voice

Stephen Stanton

Voice

Phil LaMarr

Voice

Bill Nye

Voice

Tom Kenny

Voice

Billy West

Voice

Christian Slater

Voice

Jess Harnell

Voice

Steven Weber

Talent Agent / Crazy Karl / Baz Bozzington

John DiMaggio

Voice

Neil deGrasse Tyson

Chris Colfer

Director

Frank Paur

Director

Sean Bishop

Director

Chris Bailey