Phineas and Ferb (2007)

S01E43 Hail Doofania!

When Roger, Doofenshmirtz's brother, gets elected as mayor, he sets out to create his own nation where he can have complete control. However, Perry faces challenges trying to access his lair to thwart Roger's plans. Meanwhile, Phineas and Ferb aim to help Isabella witness her "first" rainbow by inventing the Rainbow-enator, a device that utilizes their breakfast cereal to generate a colorful spectacle. The episode takes a quirky turn when Candace and Vanessa accidentally swap their clothes at the dry-cleaners, leading to a day full of unexpected twists for everyone involved.