In "For Your Ice Only", Phineas and Ferb take a hockey game to the extreme. In "Happy New Year!", the boys plan their own New Year's Eve ball drop while Candace makes a resolution to stop busting her brothers.
Fly on the Wall: Phineas and Ferb create a giant tire swing contraption; Buford messes with the wiring and creates a ray which turns Candace into a fly; Candace has a perilous adventure trying to get back to the boys to get switched back. My Sweet Ride: Phineas and Ferb complete the reconstruction of Dad's classic car entry for the Doo-Wop Hop event. Perry foils Doofenshmirtz's plot to win the Doo-Wop Hop car show, which involves turning the other entries into rust, by tricking Norm the Robot who is operating the "Rust-inator".
Doofenshmirtz hires an Outback platypus hunter who "goes rogue," forcing Perry and doctor to team up to save themselves from the boomerang-throwing maniac. Baljeet is unable to make decisions, fearing the wrong choice on even simple questions will send his life down the wrong path. Phineas and Ferb create a device that lets him see both possible outcomes of his decisions. As a side effect, it also creates a crowd of Baljeets.
Phineas and Ferb are taken back in time to the 1903 Danville World's Fair and meet kids very much like themselves; Isabella plans a picnic for Phineas; Doofenshmirtz's daughter attends a movie marathon.
Dr. Doofenshmirtz is sentenced to community service for being evil and much to his daughter Vanessa's chagrin, he's assigned to teach science at her high school. Meanwhile, a trio of bugs embark on a journey to become the first insects to communicate with humans.
On the inevitable 104th day of vacation, the season is coming to a close and it's Candace's last chance to bust her brothers; who build huge playground equipment for the finale of summer. She is quickly foiled, but when she goes to return a DVD to Vanessa and finds Dr. Doofenshmirt's Do-Over-Inator, she finds an opportunity to redo the day, which results in other consequences like rips in the space-time continuum, the shortening of days and the disappearance of her brothers.