The first episode of Season Three
King Boogieman and Princess Butterfly unite their kingdoms after their mariage. King Boogieman begins to feel sorry for all of the damage he has done to Butterfly Valley, and swears to be a better king. After he swears this oath, his eyes turn blue.
Meanwhile, in a side plot, Rose and Petunia find a heart shaped crystal, which turns out to be a magical item that makes the trolls capable of feeling love. It was replaced by a stone long ago to prevent trolls from truly feeling love, but for some reason King Boogieman as able to still feel love. The twins return the heart to the Troll Kingdom, breaking an ancient curse and making the other trolls capable of feeling love again.