Frank Welker Fred, Scooby Voice Mindy Cohn Velma Voice Grey DeLisle Daphne Voice Matthew Lillard Shaggy Voice David Kaye Argus Fentonpoof, Bill Buntman, Dr. Phobos Guest Voice Maurice LaMarche Vincent Van Ghoul, Police Man, Prof. Jantzen Guest Voice Cree Summer Paige Kruller Guest Voice April Winchell Weena, Waitress Guest Voice David Juskow Harry Schnesle-Boysen Guest Voice Sam Register Executive Producer Spike Brandt Producer Tony Cervone Producer