I must say I’m having a hard time find out a way to write this properly, it sure sucks being a lousy writer at these times. Well all I wanted to mention was the depth that some forms of entertainment reach. Some of them create entire universes to accommodate their stories some good examples are The Matrix (movie), Legacy of Kain (game series), Babylon 5 (TV show) etc.
There are of course the original products, but that is not all some of these universes are expanded or better explained in other places there are communities built around it that in many cases adds too the richness of that universe.
So I suggest that you dive in to the WWW and see if there’s more to your favorite Universe, here are some links that I found in my dive 🙂