For example, there were several good Klingon, and this time, Romulan shows. "Face of the Enemy" along with "Timescape" were probably some of the best Romulan episodes in the entire series. In "Rightful Heir" we meet Kahless, the legendary Klingon leader from years past. In "Birthright Part II", we have a somewhat weak attempt at Worf showing a bunch of Klingon prisoners what it means to be Klingon after years of captivity under Romulans. Season 6 also integrates the Cardassians a little better since DS9 started up this same time, with episodes, "Chain of Command, I & II" and "The Chase". And then of course the season ending cliff-hanger "Descent" deals with the "individuality" Borgs led by Lore.
However even the non-classic adversary episodes are nice strong Trek-ish stories involving the growing Trek universe.
"Second Chances" introduces us to William Riker's twin clone "Tom Riker" which was Levar Burton's directing debut. Be sure and watch the extras on Disc 7 for more info on this episode.
But anyway, I would recommend Season 6 to anyone who wants to see just how great TNG really was.
"Chain of Command, Parts 1 and 2" contain what I consider to be some of the best acting from Stewart ever. Picard is tortured for days by the Cardassians, and Stewart plays the role of the victim perfectly. Not only did Part 2 contain some of his finest performances, but it actually managed to convey a message as well. It focuses mainly upon the roles of the characters. The Cardassian who tortures Picard and tries to break his will is left himself a broken man at the end of the episode, while Picard attains true victory by never giving in. An entertaining, powerful episode.
However, this was only one of the many amazing episodes that season six showcased. "Relics", which featured the return of Scotty from the original Trek, was great. "Schisms" put an eerie but interesting spin on the whole "alien invaders from another dimension" idea. "Tapestry" was another episode that made use of Stewart's amazing ability as an actor. John de Lancie guest starred as "Q" in that episode, and forced Picard to relive events in his life. "Face of the Enemy" finally gave the Romulans some action again after being shadowed by the Borg and the Cardassians. "Starship Mine" was probably the most "action-packed" episode of the season, and "Timescape" was another interesting episode involving being stuck in a moment in time. Finally, "Descent, Part 1" lacked the bang of most season finales, but wasn't all bad - after all, it did involve the Borg.
Overall, season six had episodes that really shined, despite suspicions that it might not.
There are less of the great episodes that we've been used to from the 3rd to 5th seasons. Face of the Enemy, Starship Mine, Second Chances, The Chase and Timescape are all good if somewhat contrived. Descent features the return of the individual Borg faction led by Data's brother Lore. It's not strong enough as a Borg episode, the feeling of them being invincible has gone from "Q Who". Every time Star Trek faces a new, deadlier enemy, several episodes later they are made out to have human values after all - which isn't the point.
Time's Arrow, Part II
Realm of Fear
Man of the People
A Fistful of Datas
The Quality of Life
Chain of Command, Part I
Chain of Command, Part II
Ship in a Bottle
Face of the Enemy
Birthright, Part I
Birthright, Part II
Frame of Mind
Descent, Part I