The pilot episode of Star Trek: Deep Space Nine (DS9) aired just weeks before Babylon 5debuted. Babylon 5 creator J. Michael Straczynski indicated that Paramount Television was aware of his concept as early as 1989, when he attempted to sell the show to the studio, and provided them with the series bible, pilot script, artwork, lengthy character background histories, and plot synopses for 22 "or so planned episodes taken from the overall course of the planned series".
Paramount declined to produce Babylon 5, but later announced Deep Space Nine was in development, two months after Warner Bros. announced its plans for Babylon 5. Straczynski stated that, even though he was confident that Deep Space Nine producer/creators Rick Berman and Michael Piller had not seen this material, he suspected that Paramount executives used his bible and scripts to steer development of Deep Space Nine. He and Warner did not file suit against Paramount, largely because Straczynski didn't see it as a productive option, with negative repercussions for both TV series. In 1993 he responded to a Deep Space Nine fan who saw the lack of legal action as proof that Straczynski's allegation was unfounded, "If there is any (to use your term) winking and nudging going on, it's on the level of 'Okay, YOU (Paramount) know what happened, and *I* know what happened, but let's try to be grownup about it for now,' though I must say that the shapechanging thing nearly tipped me back over the edge again. If there are no more major similarities that crop up in the next few weeks or months, with luck we can continue that way."
Babylon 5's first-run syndicated ratings averaged between 3 and 4% of US households from 1995 to 1997, whereas DS9 ranged from 4 to 5% during the same time span.