I already did my top 5, so here are my bottom 5. Here are some links, they might be helpful to you if you don't see your own favorites or least favorites on this list.
Part 1 (episodes #1-13)
Part 2 (episodes #14-26)
Top 5 Best Episodes of Adventure Time (Season 2)
Ready for my picks for the 5 worst episodes of season 2? I hope so.
5. The Silent King
4. Her Parents
3. Power Animal
2. Heat Signature
1. Slow Love
So there are my least favorite episodes of the second season. Mostly, it's a pretty great season. The show hadn't branched off into more experimental territory yet, but there were still plenty of fun episodes, and the inclusion of The Lich was a major one. So keep checking in and I'll have more lists and write-ups for the show before you know it. Thanks for reading.