Cecilia Aranovich Hamilton Director Ethan Spaulding Director Matthew Lillard Shaggy Rogers Voice Kate Micucci Velma Dinkley Voice Grey DeLisle Daphne Blake Voice Frank Welker Fred Jones, Scooby-Doo Voice David Herman Jack , Sheriff Voice John Michael Higgins Alan Smithee Voice Cassandra Peterson Elvira Voice Roger Rose Lead Cat Person , Narrator Voice Jeremy Adams Screenwriter James Krieg Producer Amy McKenna Producer Rick Morales Producer Sam Register Executive Producer