The week-long national syndication window opens for the 121st episode of Star Trek: Deep Space Nine. Louise Fletcher guest stars. 
1993-1999 syndicated live-action Star Trek spinoff series, set in the 24th century during and after the sixth season of Star Trek: The Next Generation, through the fifth season of Star Trek: Voyager.
The week-long national syndication window opens for the 121st episode of Star Trek: Deep Space Nine. Louise Fletcher guest stars.
The week-long national syndication window opens for the 122nd episode of Star Trek: Deep Space Nine. This episode concludes the show’s fifth season, and kicks off the Dominion War storyline which is resolved with an unprecedented six-episode arc in the sixth season.
The week-long national syndication window opens for the 123rd episode of Star Trek: Deep Space Nine. This episode initiates the show’s sixth season, continuing the Dominion War storyline with an unprecedented six-episode arc. Brock Peters guest stars.
The week-long national syndication window opens for the 124th episode of Star Trek: Deep Space Nine. This episode continues the unprecedented six-episode story arc of the Dominion War.
The week-long national syndication window opens for the 125th episode of Star Trek: Deep Space Nine. This episode continues the unprecedented six-episode story arc of the Dominion War, and picks up the storyline of Worf’s son Alexander left over from Star Trek: The Next Generation. Gabrielle Union (Night Stalker) guest stars.
The week-long national syndication window opens for the 126th episode of Star Trek: Deep Space Nine. This episode continues the unprecedented six-episode story arc of the Dominion War.
The week-long national syndication window opens for the 127th episode of Star Trek: Deep Space Nine. This episode continues the unprecedented six-episode story arc of the Dominion War.
The week-long national syndication window opens for the 128th episode of Star Trek: Deep Space Nine. This episode concludes the unprecedented six-episode story arc of the Dominion War, although the war is an ongoing element through the remainder of the season.
The week-long national syndication window opens for the 129th episode of Star Trek: Deep Space Nine. This is the first time that two regular characters in a Star Trek series have gotten married (in this case, Worf and Dax).
The week-long national syndication window opens for the 130th episode of Star Trek: Deep Space Nine. Philip Anglim guest stars as the mirror universe Bareil.
The week-long national syndication window opens for the 131st episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 132nd episode of Star Trek: Deep Space Nine. Iggy Pop guest stars.
The week-long national syndication window opens for the 133rd episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 134th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 135th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 136th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 137th episode of Star Trek: Deep Space Nine. Nick Tate (Space: 1999) guest stars.
The week-long national syndication window opens for the 138th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 139th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 140th episode of Star Trek: Deep Space Nine. William Sadler (Roswell, Bill & Ted’s Bogus Journey) guest stars. This episode introduces the Starfleet black ops division, Section 31, which becomes a recurring feature in the Star Trek mythos, reappearing in Star Trek: Enterprise, Star Trek: Discovery (and the Section 31 spinoff movie), and even the 2013 movie Star Trek: Into Darkness.
The week-long national syndication window opens for the 141st episode of Star Trek: Deep Space Nine. Stephen McHattie guest stars as a Romulan with an uncanny eye for spotting a fake.
The week-long national syndication window opens for the 142nd episode of Star Trek: Deep Space Nine. This episode introduces the character of holodeck nightclub singer Vic Fontaine, played by actor/director/singer James Darren (who, ironically, co-starred with William Shatner in the cop show T.J. Hooker).
The week-long national syndication window opens for the 143rd episode of Star Trek: Deep Space Nine. Louise Fletcher guest stars.
The week-long national syndication window opens for the 144th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 145th episode of Star Trek: Deep Space Nine. Wallace Shawn guest stars as Grand Nagus Zek.
The week-long national syndication window opens for the 146th episode of Star Trek: Deep Space Nine.
The week-long national syndication window opens for the 147th episode of Star Trek: Deep Space Nine. Debra Wilson (Mad TV) guest stars.
The week-long national syndication window opens for the 148th episode of Star Trek: Deep Space Nine. This episode concludes the sixth season of Deep Space Nine, and is the final appearance of series regular Terry Farrell as Jadzia Dax (Jadzia is killed, but the Dax symbiont lives to inhabit another body in the seventh season).
The week-long national syndication window opens for the 149th episode of Star Trek: Deep Space Nine. This episode is the beginning of Deep Space Nine’s seventh and final season, and introduces new series regular Nicole de Boer (Mission Genesis, The Dead Zone) as Ezri Dax, the Dax symbiont’s new host body. Brock Peters and James Darren guest star.
The week-long national syndication window opens for the 150th episode of Star Trek: Deep Space Nine. Brock Peters guest stars.