"Crossfire" is a relatively quiet episode, as it's based entirely on the space station and has little in the way of action. Still, it's a super-important episode because it does a lot in the way of character development and is definitely worth seeing for fans.
When the show begins, First Minister Shakaar is visiting DS9. However, there are rumors that someone will be making an attempt on this new Bajoran leader's life--and so it's up to Odo and Worf to protect the guy. There are BIG complications, however, as Odo is extremely distracted. Instead of his steady and efficient demeanor, he is silently pining for Major Kira--and the only one who seems to realize this is Quark. Much of this distraction is because apparently Kira is a Bajoran hottie. First Vedek Bareil wants her and now Skakaar is smitten by her--and he confides in Odo about his desire to become more than just friends with her.
Believe it or not, this is an episode that might necessitate a Kleenex or two. Well worth seeing.