Frank Welker Fred, Scooby Voice Mindy Cohn Velma Voice Grey DeLisle Daphne Voice Matthew Lillard Shaggy Voice Isabella Acres Mary-Ann Geerdon, Tiffany Guest Voice Zach Callison Arthur Baywosenthal Guest Voice Tony Cervone Gary Guest Voice, Producer Gary Cole Mayor Fred Jones Sr. Guest Voice Frances Conroy Angie Dinkley Guest Voice Tom Kenny Broccoli Head, Mr. Baywosenthal Guest Voice Paul Rugg Dr. Portillo Guest Voice, Writer Patrick Warburton Sheriff Bronson Stone Guest Voice Sam Register Executive Producer Spike Brandt Producer Curt Geda Director Victor Cook Director