And here's Part 4.
31: Bargaining Part 1 (Season 6, Episode 1)
Okay, this without doubt the darkest opening episode from the show (appropriate given the season in question) but Buffy's resurrection was never going to be easy. Willow had to dabble in magic that would corrupt her throughout the season and a gang of demon bikers certainly didn't help matter. At least Buffybot was a bright spark (pun actually intended).
32: Restless (Season 4, Episode 22)
And the award for the most innovative finale goes to ... this one of course. It served as a wonderful epilogue to a good fourth season, delved into the Scoobies subconscious and thre some neccessary foreshadowing moments to later seasons. And we met the first slayer as well, who was better than Adam.
33: Primeval (Season 4, Episode 21)
In a lot of ways, this was supposed to be the Season 4 finale. It brought the Initiative arc to a much welcomed end, got rid of Adam and finally saw the gang reconnect. It's also one of many episodes from this point onwards that would use similar slow-mo type effects from The Matrix too.
34: Bad Girls (Season 3, Episode 14)
Ever since her arrival in Sunnydale, Faith's hedonism harboured something potentially destructive. Nothing brought that more when she inadvertantly killed Allan Finch and refused to feel remorse for it. On the plus, the episode generated some comedy at the expense of Wesley, who pissed everyone off on contact.
35: Tabula Rasa (Season 6, Episode 8)
Amnesia type episodes are all the range and while Angel would tackle one similarly the year after, this show did it better. A memory wiped gang had some comic moments but this was also the episode Tara had to dump Willow and Giles went back to England, so not all laughs either. It's still a classic though.