After learning about Monty and Vanessa's secret relationship, Carl bribes Monty into helping him get some much needed acknowledgement from Monogram. Meanwhile, Candace is ecstatic when she discovers that her neighbor Peggy McGee has witnessed all of Phineas and Ferb's summer antics and is happy to tell Mom about them. Also, Dr. Doofenshmirtz creates its "Inflator-inator" to try to silence his neighbor who plays the bagpipes every day.

The episode was rated 8.10 from 31 votes.

Annoyed at waiting in really long lines at the return counter, Doofenshmirtz invents a "Back-to-the-Store-inator" to send things back to the store where they came. Meanwhile, Phineas and Ferb stage an extreme batting challenge their friends take place in, and Candace's obsession to bust coincides with her and Jeremy's visit to the Extreme Water Park.

The episode was rated 8.11 from 38 votes.

Phineas and Ferb deejay at Vanessa's Halloween party. Doofenshmirtz hunts for hidden treasure in a castle.

The episode was rated 8.13 from 48 votes.

When Linda becomes overwhelmed for organizing a block party, she asks Phineas and Ferb for help. Norm falls in love with Rodney's female robot.

The episode was rated 8.14 from 37 votes.

Perry helps Doof in retrieving his father's old lawn gnome. Meanwhile, Phineas and Ferb help out their father on Father's Day

The episode was rated 8.17 from 23 votes.

Isabella unintentionally admits her feelings for Phineas in a letter. Meanwhile, Doof invents an inator to help change his misfortune

The episode was rated 8.18 from 34 votes.

Spider-Man, Iron Man, Thor and Hulk stand powerless after being struck by Dr. Doofenshmirtz's power-draining "inator." Once the supervillains – Red Skull, Whiplash, Venom and M.O.D.O.K. – find out that Dr. Doofenshmirtz is responsible for robbing the superheroes of their powers, they seek him out and together create mayhem in Danville. Meanwhile, Phineas and Ferb do everything they can to restore the superheroes' powers before the evil villains take over the world.

The episode was rated 8.20 from 64 votes.

Buford and Baljeet get in a food fight while Ferb is at the dentist. The Fireside Girls help Isabella plan a romantic picnic with Phineas. Meanwhile, Vanessa wants to go to a movie marathon, so Doofenshmirtz creates a Teleport-inator.

The episode was rated 8.23 from 31 votes.

In a parallel universe far, far away, Phineas and Ferb are tasked with returning the Death Star plans to the Rebel Alliance before Storm trooper Candace catches up to them. Meanwhile, complications arise when Perry is trapped in carbonite.

The episode was rated 8.25 from 55 votes.

It's been 10 years after the events of the present, and Phineas must decide what university to go to. After discovering that Isabella had a crush on him for years, Phineas must reach her before she leaves for college and express his true feelings for her. Meanwhile, Doofenshmirtz has a mid-life crisis.

The episode was rated 8.37 from 94 votes.

When Pinky goes missing, Phineas & Ferb create a machine that will amplify Buford’s senses to those of a dog’s. However, it works so well that the animal agents’ secret identities are put in jeopardy. Meanwhile, Candace tries to meet up with Jeremy for lunch at City Hall but gets stuck in a mandatory tour.

The episode was rated 8.39 from 28 votes.

Doofenshmirtz's latest "inator" turns Danville citizens into contagious zombies. Agent P. and the gang try to save the town and avoid becoming zombies themselves.

The episode was rated 8.44 from 36 votes.

Phineas and the gang help Love Händel prove the existence of Klimpaloon, the magical old-timey bathing suit that lives in the Himalayas, to verify that their song, "The Ballad of Klimpaloon", is legitimate.

The episode was rated 8.50 from 36 votes.

Phineas and Ferb have created a device reinforcing the wind and test them on a giant kites in the park. Candace thinks she's finally going to bust when Mom gives her backyard a makeover. Meanwhile, Doofenshmirtz builds a Water-Zalewator to celebrate his girlfriend of the past, who doused him with water, because Heinz she loved, but who then gave him the basket.

The episode was rated 8.55 from 33 votes.

Agent P travels to the glamorous city of Montevillebad to stop Doof from winning the Grand Prix and collecting the prize money. When Doof uses his "I-don't-care-Inator" to sabotage the race and eliminate the competition, including international racing legend of Italian-Scottish-Swiss-Dutch descent Paolo Vanderbeek (Patrick Dempsey), Agent P must take the wheel and go head-to-head with Doof on the racetrack.

The episode was rated 8.56 from 36 votes.