TNG "Yesterday's Enterprise"
I've seen it countless times and it never gets old for me. One of my all-time favourites.
TOS "Wolf in the Fold"
Four deltas according to the Ultimate Guide, in the latest Star Trek Magazine. I couldn't disagree more! I'll have whatever that guy's smoking. Scotty only ever had this much to do a few times in TOS it's true and he deserves it but sadly this isn't really it. I remember liking this story as kid but decided to rewatch it for the first time in ages, and unfortunately it's completely absurd and laughable. I'm going through each series in order, last week an awesome "Doomsday Machine". So a blip, I guess.