After losing a gift that Jeremy made for her, Candace is determined to recreate it before Jeremy realizes it�s missing. Unfortunately, Candace can�t remember what it looks like, so she enlists Phineas and Ferb to use their mind machine to enter into her subconscious and recapture the memory. Meanwhile, Doofenshmirtz�s evil plan is to use his Underwear-Inator to take over the Tri-State Area, since everyone’s greatest fear is being caught in public in their underwear.