When the daily crossword puzzle brings one of the worlds most useful, yet under-appreciated inventions to Phineas and Ferb's attention, the boys set out to bring the plight of the shoelace tip, the "aglet", to the worlds attention, with their only obstacle being Candace, who relentlessly wishes to convince everyone that it doesn't matter, even when she tries to use their campaign to become an insta-star. Meanwhile, Perry's new mission is to erase Doofenshmirtz' viral video, however this time, it seems both he and Heinz have the same goal, even if Doofenshmirtz wants to take it to a slight extreme.