Matthew Lillard

Shaggy Rogers (voice)

Frank Welker

Scooby-Doo / Fred Jones / Monster (voice)

Grey DeLisle

Daphne Blake (voice)

Kate Micucci

Velma Dinkley / Sandi (voice)

Jason Isaacs

King Arthur Pendragon (voice)

Nick Frost

Merlin (voice)

Greg Ellis

Herald / Herman Ellinger / British Passenger (voice)

Spike Brandt

Mr. HB (voice)

Ted Barton

Mayor Saunders / Sir Lancelot (voice)

Stephen Stanton

Peanut Vendor (voice)

Kari Wahlgren

Female Peasent (voice)

Fred Tatasciore

Black Knight (voice)