My favorite Sci Fi show of all time(closely followed by the new Battlestar Galactica) was Babylon 5.
When they took the story to the level of ancient beings leading us through life so we can evolve into something greater, it blew my mind. I sometimes wonder if J. Michael Straczynski was privy to info or through him we were tried to be taught a lesson. Lorien was an attempt at a digital Prophet almost. Passing knowledge to us.
That and it was a damn good show!