The Borg are a major threat in Star Trek: TNG and Star Trek: Voyager (I haven't watched the latter, but looking at this it seems they are). Those two series happen at roughly the same time as DS9...
star trek - Why is there no Borg threat in the DS9 series? - Science ...
star trek - What are the known Borg failed assimilations? - Science ...
star trek - How can the Next Generation's unfamiliarity with the Borg ...
star trek - Why do the Borg announce themselves? - Science Fiction ...
star trek - Were the Borg destroyed at the end of Voyager? - Science ...
star trek - Were the Dominion aware of the Borg? - Science Fiction ...
I just finished watching Star Trek: Voyager and it occurred to me that the Borg (especially with the transwarp hub that Voyager destroyed) could have assimilated the Alpha Quadrant with waves of sh...
star trek - Why did the Borg never bring waves of ships to the Alpha ...
Yahoo: What It's Really Like To Play A Borg On Star Trek
There have been plenty of iconic Star Trek villains over the years, but few have become a part of pop culture like the Borg. In the film Star Trek: First Contact, viewers were first introduced to ...
Comic Book Resources on MSN: Star Trek permanently ended the Borg storyline
Comicbook.com: William Shatner’s Favorite Star Trek Theory Reveals the Borg’s Secret Origin
The Borg are the most iconic villains in Star Trek. Introduced in The Next Generation, the cyborg Collective posed a particularly terrifying existential threat to the Federation: assimilation. Unlike ...