Frank Welker

Scooby-Doo / Rudy / Fred / Nefario (voice)

Grey DeLisle

Daphne / Daisy / Musketeer 1 / Olive (voice)

Matthew Lillard

Shaggy / Craggly / Captain Cutler (voice)

Kate Micucci

Velma / Helga (voice)

Myrna Velasco

Coco Diablo (voice)

Dee Bradley Baker

Esteban / Mr. Wickles / Cat Man (voice)

Jeff Bennett

Shady Guy / Charlie Humdrum / Hank (voice)

Anthony Carrigan

Trevor Glume / Farmer (voice)

Erin Fitzgerald

Library Kid / Superhero Girl / Musketeer 2 (voice)

David Lodge

Warden Collins / Harry the Hypnotist / Inspector (voice)

Lara Jill Miller

Prisoner Costume Teen / Superhero Boy / Musketeer 3 (voice)

Candi Milo

Prison Woman / Dinosaur Kid / Monster Kid (voice)

Jenelle Lynn Randall

Librarian / Superboy (voice)

Kevin Michael Richardson

Sheriff / Henry Bascombe / 10,000 Volt Ghost (voice)