One of the more ambitious sci-fi series, this meticulously plotted drama is set in the 23rd century on a space station where the Babylon 5 crew try to keep the peace. And what a job! Some 250,000 beings from many worlds live there. The compelling and complex saga spawned hundreds of Web sites and counted NASA engineers among its fans. And when its end came, cast member Bill Mumy invoked another cult favorite, the Grateful Dead: 'What a long, strange trip it's been.'