Though this is probably a minority opinion, "Look at the Princess" is my favorite of Farscape's trilogies. Crichton and Aeryn's romance is the heart of this show, and these are the episodes where they finally start to focus on it (though perhaps not in ways you might expect).
Aeryn: "No! No! I will not be a slave to your hormones!"
John: "My hormones? Hey, I was lips, you were tongue!"
It also serves to introduce us to the Scarrens, even if it is only one guy.