Kimmy Sue was the junior high crush of Riff and Torg. Kimmy wrote a note asking one of them to meet her to become her boyfriend, but they disagreed on who it was for. While fighting over the Wand of Scoobusdobios Du, an ancient magical artifact from Mohkadun they wanted to use to impress her, they accidentally transformed a man into a giant carnivorous smurf. They both missed the meeting, and Kimmy Sue moved to Canada.
When she visits Riff and Torg in the present, Kimmy Sue tells them that she no longer remembers who she meant the note for and that she is now married with a daughter.