Frank Welker Scooby-Doo / Fred Jones (voice) Grey DeLisle Daphne Blake (voice) Matthew Lillard Shaggy Rogers (voice) Kate Micucci Velma Dinkley (voice) Cassandra Peterson Elvira (voice) Bill Nye Himself (voice) Dwight Schultz Jonathan Crane (Scarecrow) (voice) Bumper Robinson Mike (Voice) David Herman Sheriff / Cutler Tot (Voice) Roger Craig Smith Autopilot / Parent (Voice) Fred Tatasciore Alpha Jackal Lantern / Federal Agent Malarkey (Voice)