Watch Scooby-Doo's Original Mysteries (2000) : Full Movie Online Free See how your favorite snack-munching canine super-sleuth got his start as the first five Scooby-Doo episodes ever unleashed - the series pilot What a Night for a Knight, plus Hassle in the Castle, A Clue for Scooby-Doo, Mine Your Own Business and Decoy for a Dognapper - constitute Scooby's first-ever dynamite DVD! Also features an abbreviated music video and a trivia quiz.