Frank Welker Fred, Scooby Voice Mindy Cohn Velma Voice Grey DeLisle Daphne Voice Matthew Lillard Shaggy Voice Dee Bradley Baker Slime Mutant, Franklin Fruitmeir Guest Voice Tony Cervone Gary Guest Voice, Producer Gary Cole Mayor Fred Jones Sr., Foreman Guest Voice Frances Conroy Angie Dinkley Guest Voice Casey Kasem Colton Rogers Guest Voice Vivica A. Fox Angel Dynamite Guest Voice Jeff Bennett Professor Emmanuel Raffalo, Tourist Guest Voice Kevin Dunn Male Dinkley, Workman 1 Guest Voice Kath Soucie Nan Blake, Tourist Guest Voice Fred Tatasciore Workman 2 Guest Voice Sam Register Executive Producer Spike Brandt Producer Curt Geda Director Mitch Watson Writer