I'm surprised the rating isn't higher. While not one of the best cartoons ever, this was still great. Happy Halloween! I've been saying that a lot lately. It seemed like some of the characters were using actual words here. Maybe it's just coincidence.
I loved the theme of these monsters appearing. For all the goofy stuff that occurs in the series, you really don't have that many supernatural beings. This was different. It seemed like an obvious thing. The colors worked great too.