"Naked Time" - if I have the name right on the episode. Spock getting the "seven year itch", T'Pau, the lyrpa...and of course, the greatest fight music ever created.

"Trouble With Tribbles" also gets the nod as a more comedic episode. Harry Mudd was a great recurring character. And the alternate universe..."I have many operatives, and some of them are Vulcan". Set the standard for all parallel universes being evil and having beards.
I liked Doomsday Machine because there was a ship crewed entirely by Vulcans, and the illogic of such a weapon was beyond their understanding.
In TNG, "Rightful Heir" and many of the episodes positively focusing on Worf. The Borg shows are great, "Hugh" was a good twist, but I'd even add in the McCarthy-like trial episode. That one got me watching and enjoying TNG.
I do enjoy Enterprise. This past week's was a good one. I wasn't sure until the end if the show was going to end with the Zendi as diverse and divided (some even being unaware of the war), or if it was going to swerve us and have that Zendi character deliberately leading Archer astray.
[ January 09, 2004, 20:00: Message edited by: Cheeze ]