Tony Cervone Director, Producer Frank Welker Scooby-Doo , Fred Jones Voice Matthew Lillard Shaggy Rogers Voice Grey DeLisle Daphne Blake Voice Mindy Cohn Velma Dinkley Voice Paul Stanley The Starchild Voice Gene Simmons The Demon Voice Tommy Thayer The Spaceman Voice Eric Singer The Catman Voice Kevin Shinick Screenwriter Andy Sturmer Original Music