: Phineas and Ferb begin their summer by building a logic-defying rollercoaster in their backyard, setting the "big project" template for the series.
: Candace initiates her endless quest to "bust" her brothers by trying to show their mother, Linda, the massive coaster. [S1E1] Rollercoaster/Candace Loses Her Head
: This episode introduces Phineas’s iconic catchphrase when he notices Perry has disappeared. : Phineas and Ferb begin their summer by
: The invention conveniently vanishes just as Linda arrives, a staple "helpful" plot device usually caused by Dr. Doofensmirtz's antics. [S1E1] Rollercoaster/Candace Loses Her Head