Cecilia Aranovich Hamilton Director Frank Welker Scooby-Doo, Fred Jones Voice Grey DeLisle Daphne Blake, Wonder Woman Voice Matthew Lillard Shaggy Rogers Voice Kate Micucci Velma Dinkley Voice P.J. Byrne J.B Voice Victoria Grace Mercy Voice Charles Halford Lex Luthor Voice Nolan North The Joker, Superman, Computer Voice T.K. O'Brian Screenwriter Rick Morales Producer James Krieg Producer Sam Register Executive Producer Kyle Stafford Film Editing Robert J. Kral Original Music Wes Gleason Casting