"What a Night for a Knight" is the first episode of Scooby-Doo, Where Are You!, which means its monster-of-the-day ... Soon, the villain is unmasked as the puppeteer Pietro, who the gang ...

Scooby and the gang confront an anonymous masked villain who is plotting to take over the city of Coolsville by wreaking mayhem with a monster machine that creates Mystery Inc.'s classic foes.