Board Thread:General Discussion/@comment-37570365-20181120204851/@comment-27700324-20181121043342

DC is too complicated a world on its own without opening the door to team ups from other franchises. Supernatural teamed up with Scooby-Doo because Scooby doesn't exactly connect into a massive universe, and is very episodic. They also had lots of similarities such as their connection with monsters. The fact that Supernatural makes a lot of references to Scooby also helped matters. Their references to DC are the same as any other TV show ever.