User blog:SonicFan/DTV Scooby-Doo movies rated TV PG

What I notice is that these three direct-to-video Scooby-Doo movies are rated TV PG: Wrestlemania Mystery, Frankencreepy, and Moon Monster Madness''.

That leaves me with one question. Why have they been given this rating? What content could there be in those movies that lead to these movies getting such a rating rather than TV G or TV Y7?