One of the letters asks if they will see Phineas and Ferb as teenagers, and Dan replies they will and introduce the episode taking place ten years in the future.As summer reaches its end, a teenaged Phineas is contemplating to Ferb which college or university he should go to, being the only one in their friend group who hasn't decided where he's going yet.He tells them that he has already graduated and is now a professor, and is hoping for Buford to attend his classes; though Buford is leaning towards attending film school instead. A., Irving, now working as an intern, notices Doofenshmirtz’s inator alert going off and informs his superior, Commander Carl.
At the Nosh Olé Mexican-Jewish Café, the now teenage Fireside Girls discuss the art of manipulation when Ginger attempts to persuade Baljeet to go to the movie she wants to see, rather than the one he wants to see. " | "The Monster of Phineas-n-Ferbenstein" | "Oil on Candace" "Out of Toon" | "Hail Doofania!The girls also contemplate how Phineas and Isabella are not a couple. (takes out her cell phone) Oh, wait, I don't have any charge. Buford: I just got the 21G and the software won't be ready for two months. (All the girls look at the empty backyard.) Katie: Wow! Jump Instructor: You want to know the best part about being a jump instructor? (The jump instructor pushes him off the plane)Lawrence: Linda! " | "Atlantis" | "Phineas and Ferb Christmas Vacation!Deciding that they should take it upon themselves to set Phineas and Isabella up with each other before she leaves for college, Adyson instructs Ginger to text Baljeet about their plan. You know, since you were kids she's had a huge crush on you. I don't know what's come over me, but I'm starting to get the most wild and uninhibited ideas! " "Just Passing Through" | "Candace's Big Day" | "I Was a Middle Aged Robot" | "Suddenly Suzy" "Undercover Carl" | "Hip Hip Parade" | "Invasion of the Ferb Snatchers" | "Ain't No Kiddie Ride" "Not Phineas and Ferb" | "Phineas and Ferb-Busters!Surprised by the revelation that Isabella had always had a crush on him, Phineas decides to clear his head by going for a walk. Isabella: I sort of gave up when we got to high school. I think that's when I started to have a thing for you. It seems like only yesterday we were drawing our first doodles of these kids on the place mats of that... " "Ready for the Bettys" | "I Scream, You Scream" | "Toy to the World" "Get That Bigfoot Outa My Face!Buford and Baljeet then decide to try to get Phineas and Isabella together before she leaves. Dan Povenmire: (consoling Swampy) Yeah, I, I know, it's a... Jeff "Swampy" Marsh: Now they're, they're growing up... " | "It's a Mud, Mud, Mud, Mud World" | "Mom's Birthday" "Journey to the Center of Candace" | "It's About Time!