Draft:Last Day of Summer (Phineas and Ferb episode)

"Last Day of Summer" is the 48th broadcast episode and final episode of the fourth season of Phineas and Ferb, the 222nd episode broadcast episode overall, and the finale of the first run. It was simulcast on Disney Channel and Disney XD on June 12, 2015 and was viewed by 2.94 million people. Originally serving as the series finale, the characters would later appear in the creators' subsequent series Milo Murphy's Law and Hamster & Gretel, and a Disney+ film Phineas and Ferb the Movie: Candace Against the Universe, before being renewed for two more seasons in 2023.

Plot

On the morning of the last day of summer vacation, Candace wakes up as Phineas and Ferb announce their plans to create their biggest project ever to their friends Isabella, Buford, and Baljeet. Candace realizes that today is her last chance to bust her brothers. Meanwhile, in his secret lair, Perry the Platypus is briefed by Major Monogram, theorizing that Dr. Heinz Doofenshmirtz will try to end the summer with an especially significant invention.

At Doofenshmirtz Evil Incorporated, as Heinz wakes up, he hits his head on a hanging lamp, which he vaporizes out of frustration. Vanessa tries to get his attention; however, he gets distracted and she leaves.

At home, Phineas, Ferb, Isabella, Buford, and Baljeet test the ride they built, but Candace fails to bust her brothers to her mother.

Perry the Platypus arrives at Doofenshmirtz Evil Incorporated, where Heinz tells Perry that he realized that throughout the summer he has been trying to become the ruler of the Tri-State Area, without realizing that such a position does not legally exist. He reveals his "Tri-Governor-inator", which will legally create the position and allow him to run unopposed since nobody is aware of it. Perry starts to thwart Heinz, but when Candace visits, he hides to protect his identity. Candace finds a "Do-Over-inator", which Heinz explains is able to restart a day, although it doesn't function perfectly. Curious, Candace presses a button, causing time to rewind. Candace wakes up in her bed again at the beginning of the day, as Phineas and Ferb reveal the plans for their project in the backyard again; Candace realizes this gives her another chance to bust the boys.

Heinz also wakes up at the start of the day, bumping his head on the lamp again, confused as it should have been vaporized. As Vanessa tries to talk to him, Heinz realizes that the Do-Over-inator works and will continue looping the day until it's shut off. Vanessa, angry at being ignored, tells her father she's going to start living at her mother's home full-time. Heinz is upset, but hopes he'll be able to win Vanessa back by becoming ruler of the Tri-State Area. Heinz uses his advance knowledge of Perry's entrance to trap him, but he still manages to destroy the Tri-Governor-inator.

As the day continues looping, Candace and Heinz use their advance knowledge of the day's events in attempt to succeed. Candace repeatedly brings Linda home in ridiculous situations, but fails to bust Phineas and Ferb. Heinz gradually sets out new items to trap Perry the Platypus, but he always escapes and destroys the Tri-Governor-inator. As the day loops, blue rifts begin suddenly appearing, snatching away various items, such as muffins, spoons, capri pants, and tigers, causing everyone but Candace and Heinz to permanently forget about them. Heinz acknowledges this may cause problems with the space-time continuum, but is dismissive of the risk.

Finally, Perry is incapacitated by Heinz's traps long enough to fire the Tri-Governor-inator, creating a mansion on top of the city hall. Heinz catches a man on the street and gets him to elect him as "Tri-Governor". Vanessa tries to tell Heinz this isn't what she wanted, but he ignores her. Now that he's achieved his goal, Heinz goes to turn the Do-Over-inator off, but a rift sucks it away before he can reach it.

Panicked about the disappearing items, Candace tries to ask Phineas and Ferb for help, but they are sucked into a rift. They find themselves in a gray and mostly empty version of Danville; as they explore, they find several items that have been sucked into rifts and remember them immediately.

Back in Danville, Vanessa tells Heinz that she's been accepted as an intern at the O.W.C.A., but can't join if she's living with the organization's enemy. When Heinz realizes he doesn't feel fulfilled from achieving his goal, he decides to become good so that Vanessa can accept the internship. The day loops, and he immediately begins work on a "Time-Straighten-Out-inator" to fix spacetime with Vanessa and Perry's help.

Candace finds Isabella, Buford, and Baljeet, who no longer remember Phineas and Ferb. Candace shows them the rifts using a spacetime monitor from Baljeet. Together, they predict the location of the next rift and attempt to pull Phineas and Ferb out using a life preserver; however, they are instead sucked into the rift themselves. Baljeet explains that the looping days are shortening in both directions. The gang finds the Do-Over-inator, and build a catapult to launch themselves back through a rift after predicting its appearance. They land back in the backyard.

Heinz and co. finish the Time-Straighten-Out-inator; Heinz explains that activating the machine has a 55% chance of stopping the time anomaly, and a 45% chance of destroying everything in existence. Meanwhile, without enough time to reach the Do-Over-inator, Candace throws a spoon at the button to shut it off; the buttons on the Time-Straighten-Out-inator and Do-Over-inator are pressed at the same time. The time anomaly is stopped successfully; however, Perry the Platypus realizes that the Time-Straighten-Out-inator was never plugged in.

With time successfully restored, the gang reflects on the events of the summer; they then head inside for pie, and Phineas waves to the camera before closing the door.