Frank Welker Fred, Scooby Voice Mindy Cohn Velma Voice Grey DeLisle Daphne Voice Matthew Lillard Shaggy Voice Lewis Black Mr. E Guest Voice Tia Carrere Judy Reeves Guest Voice Kate Higgins Mayor Janet Nettles Guest Voice Udo Kier Professor Pericles Guest Voice Tim Matheson Brad Chiles Guest Voice James Arnold Taylor George Avocados, Benson Fuhrman Guest Voice Patrick Warburton Sheriff Bronson Stone Guest Voice Sam Register Executive Producer Spike Brandt Producer Tony Cervone Producer