[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 building a logic-defying rollercoaster in their backyard, setting the "big project" template for the series. [S1E1] Rollercoaster/Candace Loses Her Head

: Candace initiates her endless quest to "bust" her brothers by trying to show their mother, Linda, the massive coaster. (the second half of S1E1) specifically features the

(the second half of S1E1) specifically features the family celebrating Candace’s birthday at Mount Rushmore, where Phineas and Ferb attempt to carve her face into the mountain as a "helpful" gift, while Candace nearly loses her mind trying to expose them. Doofensmirtz's antics

: Perry the Platypus sneaks off to his secret lair to receive a mission from Major Monogram, marking the first time he foils Dr. Doofensmirtz's "Inator."

: The invention conveniently vanishes just as Linda arrives, a staple "helpful" plot device usually caused by Dr. Doofensmirtz's antics.

In the pilot episode of Phineas and Ferb , several "helpful" recurring features and tropes of the series are established: