3. Carnivale
Alright, this show is pretty old. Perhaps it's one of those shows that's so old that not many people today has seen it or even heard of it. I was too young to catch this show when it originally aired but I've gotten the chance to watch it recently and all I can say is that I'm completely taken aback by the fact that it didn't run longer. There were so many story lines that the writers could have explored and expanded into an infinite amount of seasons. This should would be perfect for a come back, maybe the world is ready for it!