8 Mind-Blowing Connections Between the Works of Joss Whedon

I always love to see some crazy shared universe theories, and I actually hadn't heard this one yet. My only problem is, doesn't either Firefly or Serenity specifically tell us that Earth was abandoned because all of its resources were used up? Unless that's what they want us to think.

Now the only real question is, how does Doctor Horrible and that one episode of Glee fit in?