Since I'm doing an original series re-watch in reverse order, I just went from "Spock's Brain" to "Assignment: Earth." Wow. The third season "atmosphere" is just ... different (and not in a good way). Granted, "Assignment: Earth" isn't a typical episode -- and I've always liked it more than a lot of people do -- but the "aura" of the second season compared to what I just watched in all of season 3 is incredible. Honestly, I can't figure it out. Same cast. Same standing sets. Same director (at least in "Assignment: Earth" and "Spock's Brain"). Same cinematographer (for part of season 3, anyway). I'm not talking about the scripts -- we all know how much better those were in seasons 1 and 2 -- but the vibe of the show itself. Yes, the music is different and the material of the costumes changed -- but it's more than that. To quote Scotty in "That Which Survives": "The ship feels wrong." Substitute "show" for "ship" and that sums it up. Any thoughts?