The boys are able to create a giant bubble which enables them and their friends to float and view all of Danville from above as Candace tries to bust them while on a practice drive with Mom for her learner's permit. Meanwhile, Dr. Doofenshmirtz tries to gain popularity by singing country and western music and Perry must stop him before the concert crowd submits to his latest invention. / Isabella and the Fireside Girls set out to find the rare maraca nut tree so they can get its much needed sap for Phineas and Ferb's bubble invention. Their quest leads them to an old abandoned amusement park. Meanwhile, Pinky the Chihuahua must stop his archenemy, Professor Poofenplotz, from acquiring her favorite brand of hair spray, which she needs to look beautiful enough in order to plan taking over the world. The last of the discontinued product is located at the same amusement park.