The week-long national syndication window opens for the 64th episode of Star Trek: The Next Generation. This episode begins the epic Klingon story arc that runs through several more episodes of TNG and even into spinoff series Star Trek: Deep Space Nine. Tony Todd guest stars. 
The week-long national syndication window opens for the 65th episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 66th episode of Star Trek: The Next Generation. Jennifer Hetrick and Max Grodenchik (Star Trek: Deep Space Nine) guest star.
The week-long national syndication window opens for the 67th episode of Star Trek: The Next Generation. Michael Cavanaugh (Starman) guest stars.
The week-long national syndication window opens for the 68th episode of Star Trek: The Next Generation. Dwight Schultz (The A-Team) guest stars.
The week-long national syndication window opens for the 69th episode of Star Trek: The Next Generation. Saul Rubinek (Warehouse 13) guest stars.
The week-long national syndication window opens for the 70th episode of Star Trek: The Next Generation. Mark Lenard (Planet Of The Apes) guest stars as Spock’s father Sarek, the first original series character to appear since the cameo appearance of Dr. McCoy in the series pilot.
The week-long national syndication window opens for the 71st episode of Star Trek: The Next Generation. Majel Barrett Roddenberry and Ethan Phillips (Star Trek: Voyager) guest star.
The week-long national syndication window opens for the 72nd episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 73rd episode of Star Trek: The Next Generation. The season finale is the first part of a two-part cliffhanger (and three-episode arc), the first cliffhanger in the Star Trek franchise since the original series’ first season. The concept of Borg assimilation is introduced in this story.
The week-long national syndication window opens for the 74th episode of Star Trek: The Next Generation. Despite a summer of rumors (spread primarily via pre-internet computer bulletin board systems) involving cast members being killed off in the conclusion of the Borg two-parter, the regular cast returns, leaving Riker with the task of recovering and restoring the Borg-abducted Captain Picard. A soundtrack album for both parts of the story is released in 1991 by popular demand. This episode opens the series’ fourth season.
The week-long national syndication window opens for the 75th episode of Star Trek: The Next Generation. Whoopi Goldberg, Theodore Bikel and Jeremy Kemp guest star in an episode that, for the first time in the Star Trek franchise, has no scenes on the bridge of the Enterprise.
The week-long national syndication window opens for the 76th episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 77th episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 78th episode of Star Trek: The Next Generation. Eric Menyuk guest stars as the Traveler.
The week-long national syndication window opens for the 79th episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 80th episode of Star Trek: The Next Generation. Suzie Plakson guest stars and Jonathan Frakes directs; with this episode, TNG surpasses the original Star Trek’s 79 episode run.
The week-long national syndication window opens for the 81st episode of Star Trek: The Next Generation. Andreas Katsulas (Babylon 5) guest stars.
The week-long national syndication window opens for the 82nd episode of Star Trek: The Next Generation. Nick Tate (Space: 1999) guest stars in the last episode to feature Wil Wheaton as a series regular.
The week-long national syndication window opens for the 83rd episode of Star Trek: The Next Generation. Whoopi Goldberg guest stars.
The week-long national syndication window opens for the 84th episode of Star Trek: The Next Generation. This is the first episode featuring Data’s cat, Spot.
The week-long national syndication window opens for the 85th episode of Star Trek: The Next Generation. This episode introduces the Cardassians and begins to lay the groundwork for future Star Trek spinoff Deep Space Nine. Bob Gunton guest stars.
The week-long national syndication window opens for the 86th episode of Star Trek: The Next Generation. This is another script dusted off from the files of the never-made Star Trek Phase II series in the late ’70s.
The week-long national syndication window opens for the 87th episode of Star Trek: The Next Generation. Whoopi Goldberg guest stars as Gloria. From Cleveland.
The week-long national syndication window opens for the 88th episode of Star Trek: The Next Generation. Carolyn Seymour (Survivors) and Bebe Neuwirth (Cheers) guest star.
The week-long national syndication window opens for the 89th episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 90th episode of Star Trek: The Next Generation. Whoopi Goldberg, John Vickery (Babylon 5) and Brian Tochi (Space Academy) guest star.
The week-long national syndication window opens for the 91st episode of Star Trek: The Next Generation.
The week-long national syndication window opens for the 92nd episode of Star Trek: The Next Generation. Dwight Schultz (The A-Team) guest stars.
The week-long national syndication window opens for the 93rd episode of Star Trek: The Next Generation. John de Lancie, Jennifer Hetrick and Clive Revill (Wizards & Warriors, The Empire Strikes Back) guest star.