Forget the Star Trek spinoff series, all the Star Trek films, and every other space-SF series that has hit the airwaves since the original Star Trek was made. They're pikers, amateurs, also-rans. Babylon 5 is the true spiritual successor to the original Trek, the finest space-based science fiction to hit the small screen in at least the last thirty years.
Babylon 5 is a gigantic "O'Neill cylinder" type space station that orbits a planet light-years from nowhere, deep in neutral territory. It's a cross between what the United Nations was supposed to be and Casablanca, in space. Babylon 5 tells the story of this place, a grand sweeping epic that spans five years and three wars, and entangles countless people from many different species in a far-reaching web of events that changes the course of history for the entire galaxy.