Evil Keiko was amazing. I don't know if the entity or such will return but it has to possess Keiko for a second time, just for the chance to see her go evil again, haha.
There was another set of great eps...
(Ascent, I actually was slightly more invested in Jake and Nog's rooming situation but only cuz I know Odo and Quark won't die. Though Odo breaking his leg was a bit alarming...
Rapture, Kasidy came back!!! Woo!!! Also loved Sisko obsessing on the puzzle of finding the lost city. I like it better than his baseball stuff...
Darkness and the Light, it's a freaking killer thriller! Great mystery, great gimmick with the countdown, great wrap up. Also Nog was a side MVP again...)
... but I cried a little at 4x12 The Begotten. Odo was happy. He was bonding with his not-dad. They didn't have to screw with viewers by taking it all away. I don't know if I want the side reward, not at that expense. Odo would have probably found another way. But it was just too tragic

and putting it as a counterpart to Kira's birthing too, argh.
Dang, season 5 is just brilliant. I kinda want them to stop now or at ep13 so one could say that season had all winning eps, at least to me.