Scooby-Doo, Where Are You! Season 3 Episode 11 The Diabolical Disc Demon ( Air Date 1978-11-18 ) Genre Animation, Mystery, Comedy, Kids, Family category. Overview "The gang go to Decade Records recording studio to see a live recording from their friend, Jimmy Lewis, but the building is haunted by the Phantom, who is trying to find a song by a missing writer, and will stop at nothing until he gets it.".