It's nearing the end of Phil and Keely's sophomore year, and the yearbook results are in! Phil and Keely are voted "cutest couple", which surprises them, as they're not a couple in the first place. This causes them to finally spill their feelings for each other and become a couple. Troubles arise, though, as Pim accidentally fixes the Time Machine and the Diffys decide that it's finally time to go home. How will Phil say goodbye to Keely now, when their relationship has finally gone one step further? How will Keely react?