Phineas looks at a large machine that is on a blueprint, of which Ferb approves. At that time, the Fireside Girls come by and Isabella says "What'cha doooooin'?" Phineas says hi and tells her that they are making a giant musical machine with cannons, catapults, and it is huge. Isabella exclaims that the troop can earn their Creativity and Adventure patches. Isabella tells the Fireside Girls that they need to help Phineas and Ferb, of which they agree in an excited way. Candace, though, has other plans - to try to bust Phineas and Ferb.