The masked monsters sometimes had surprising motives, and there's at least one instance where the monster was technically real. "What a Night for a Knight" is the first episode of Scooby-Doo ...

A gypsy fortune teller warns Scooby and the gang not to visit Franken Castle. They go anyway and find themselves chased by a werewolf, a vampire and a Frankenstein Monster.

Parents need to know that Scooby-Doo 2: Monsters Unleashed is a 2004 movie based on the popular 1970s and '80s cartoon series. Aside from really bad CGI, expect many of the gags, tropes, pratfalls, ...