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)