"Babylon 5: The Gathering" airs 1993

The television movie, Babylon 5: The Gathering, the episode that started it all, aired February 22, 1993. The series would start the following year in 1994, with some changes.  Written by J. Michael Straczynski, it starred Michael O'Hare (Commander Jeffrey Sinclair), Jerry Doyle (Michael Garibaldi), Mira Furlan (Delenn), Peter Jurasik (Londo Mollari), Andreas Katsulas (G'Kar), and Patricia Tallman (Lyta Alexander). Tamlyn Tomita appeared as Lt. Cmdr. Laurel Takashima, but was replaced by Claudia Christian (Lt. Commander Ivanova) in the series.  Andrea Thompson was a character added in the series as PsiCorps telepath Talia Winters.

It was a great look into a non-Roddenberry vision of space exploration and space travel.  The series lasted 5 seasons, and spawned a few spin-offs and television movies.

Babylon 5 episode "Babylon Squared" airs 1994

One of my favorite episodes of Babylon 5, Babylon Squared, first aired August 10, 1994.  Babylon 5's predecessor station, Babylon 4, reappears after it vanished mysteriously four years prior.  I've only seen it once, so I need to go back and re-watch it. I do remember that Babylon 4 and its disappearance figured prominently throughout the series.  

It was the twentieth episode of the first season of Babylon 5, so Michael O'Hare was still on cast as Commander Jeffrey Sinclair, and Andrea Thompson as Talia Winters, although she did not appear in this episode.  J. Michael Straczynski wrote the episode.