When mysterious stains appear on the Flynn-Fletchers carpet, they assume someone spilled water. But when Candace finally confesses that Perry made the mess, Linda encourages her to seek animal therapy. In an attempt to end his uncontrollable problem, Perry retires from his agent job and tours the world in search of himself. But nothing prepares him for what he discovers: he's in love with Phineas & Ferb's sister, Candace!