Matthew Lillard
Shaggy Rogers (voice)
Thea White
Muriel Bagge / Rich Old Lady (voice)
Grey DeLisle
Daphne Blake / Frau Glockenspiel (voice)
Frank Welker
Scooby-Doo / Fred Jones (voice)
Kate Micucci
Velma Dinkley (voice)
Jeff Bennett
The General / Self Help Book (voice)
Paul Schoeffler
Katz / Le Quack / Narrator (voice)
Marty Grabstein
Courage / Mr. McGill (voice)
Jeff Bergman
Eustice Bagge / Computer / Mayor of Nowhere (voice)
Chuck Montgomery
The Lieutenant / Mr. Glockenspiel (voice)