Phineas and Ferb remodel Mount Rushmore for Candace's 15th birthday, while Agent P stops Dr. Doofenshmirtz from making a tunnel to China.
After taunting the boys for going to search for the "Lake Nose Monster", Candace begins freaking out on her lifeguard job, seeing the monster at every turn. Meanwhile, Dr. Doofenshmirtz tries to remove all the zinc from the lake, though even he's not sure why.
Phineas and Ferb decide to find out what Perry's chatter means. However, they later find out that the Perry translator works on all animals and decide to use it to help all of the animals in Danville. Meanwhile, Candace tries to spend some time with Jeremy, but she keeps being interrupted by Suzy's poodle, and Dr. Doofenshmirtz tries to flood the Tri-State Area, and invents a vehicle that drives on water. / The boys decide to spread the word about the tip of the shoelace, called the "aglet." Meanwhile, Doofenshmirtz is featured in the newest viral video to hit the internet.
Phineas and Ferb help Baljeet with his Festival entry for the biggest watermelon using a growth elixir which Candace uses in order to increase her height in order to be the next Flawless Girl. Elsewhere, Dr. Doofenshmirtz plans to cover the Festival with the "worst smell in the history of mankind". / After their pet goldfish did so much for them, Phineas and Ferb build an aquarium in their backyard as a way of saying thanks. Meanwhile, Candace awaits a call from Jeremy and Perry the Platypus stops Doofenshmirtz from destroying Hot Dog vendors.
Candace’s gelatin party inspires Phineas and Ferb to use Isabella's swimming pool for making gelatin. Doofenshmirtz invites Agent Perry the Platypus over for tea. The diabolical doc made a devilish device that can make anything evil. Doc tried to zap A.P. with this ray. A.P. dodged so the ray zapped the gelatin. It turned evil and came to obey doc. The gelatin monster grabbed A.P. who threw his hat at the fire-extinguisher sprinkler. The water dissolved the gel and also fried the electronics in doc's zapper hence ruining doc's plans. / While in London, Candace and Stacy emulate Sherlock Holmes and Dr. Watson, while trying to bust Phineas and Ferb. Meanwhile, Perry must team up with British agent Double-0 0 in order to stop Dr. Doofenshmirtz from moving Big Ben to the Tri-State Area.
Thanks to Stacy's advice, Candace tries to figure out how Phineas and Ferb's crazy creations disappear every time before their Mom sees it. Dr. Doofenshmirtz creates an Invisible Ray to make the Fireside Girls invisible when they come knocking to sell him cupcakes. / Phineas and Ferb open Chez Platypus, which becomes the trendiest restaurant in town. Jeremy asks Candace out on a date to the restaurant. Meanwhile, Doofenshmirtz goes on another date from his online dating service, and vows to destroy all love in the Tri-State Area if the date doesn't go well.
Phineas and Ferb find an egg and believe it's Perry's, and they take care of it until Candace decides to teach them how to properly take care of an egg. Meanwhile, Heinz Doofenshmirtz plans to get revenge on whales for stealing his old girlfriend. / Phineas and Ferb accidentally trap Candace in a video game and have to help her out so that she can get ready for the cotillion. Meanwhile, Perry has to stop Doofenshmirtz from zapping men into wearing ball gowns with the Ballgowninator.
It's another average, logic defying day for Phineas and Ferb, until a crashed space pod, carrying an unbearably cute alien, Meap, thrusts the boys into another adventure in space! Everyone has a different role to play, while Candace holds on to Meap by accident, Ferb is fixing up the ship, as Phineas uses the new cute tracker to find where their new friend is, to the slight irritation of Isabella, as he can't get what *cough* is causing cute interference, but of course, it all has to lead up to the big explosive finale in SPACE -ace-ace. Meanwhile, Doofenshmirtz has a new plan, simplistic in nature, but buried in an avalanche of backstory, oh dears.
The Flynn-Fletcher's neighbors have relatives visiting who bear an uncanny resemblance to Candace, Phineas, and Ferb. In fact, older sister Mandy has two younger brothers, Thaddeus and Thor, who drive her crazy with their ambitious projects. Although Candace and Mandy initially bond, they soon compete, urging their brothers to build the best backyard fort. Meanwhile, Perry finds himself in the middle of Dr. Doofenshmirtz's family reunion where Dr. Doofenshmirtz tries to win the annual kickball tournament with the Kick-inator 5000. / Phineas and Ferb set out to build a bigger plane than Howard Hughes' wooden Spruce Goose, so they build it out of papier-mâché, to do a similar theme to the Spruce Goose, complete with in-flight service and entertainment. Dr. Doofenshmirtz is doing his part to be green by using recycled materials to build an "Evaporator-inator" to dry up all the pools in the Tri-State area. Meanwhile, Candace and Stacy attend Jeremy's pool party only to discover an adventu
When Candace learns that Jeremy will star in a TV commercial, she worries that, with his new-found celebrity, he will forget about her. So, as Phineas and Ferb produce their own TV game show, Candace uses the opportunity to get herself on the airwaves. Meanwhile, Dr. Doofenshmirtz tries to erase all infomercials in the Tri-State Area. / Phineas and Ferb help Isabella and the Fireside Girls by building an automatic car wash to help with fundraising to save the star-nosed mole. Meanwhile, Stacy advises Candace to play hard to get with Jeremy. But when Jeremy asked Candace out for a ride to her brother's car wash, she ignores her BFF's advise and goes on the date, anyway. Elsewhere, Dr. Doofenshmirtz tries to make a mountain out of a molehill - literally.
When Phineas and Ferb think Perry is lost, they use the power of music to find him. Meanwhile, Candace, who fears she is at fault for Perry's disappearance, combs the Tri-State area to find him. As it turns out, Doofenshmirtz has been downgraded to a low-level threat and Perry has been reassigned to a more dangerous villain and a new family. / The Flynn-Fletcher family becomes marooned after a summer storm shipwrecks them on an island, and Phineas, Ferb and Isabella use the opportunity to build a Swiss Family style tree house which angers an already irritated Candace who wants to get back in time for Jeremy's party. Meanwhile, on the same island, Dr. Doofenshmirtz uses free monkey labor to boost a new laundromat business.
Major Monogram and Dr. Doofenshmirtz host this special episode counting down the top 10 most popular music videos from the show's first season as voted by the fans and viewers, but not without the evil doctor attempting to pull off another scheme to gain power. Fortunately, Perry the Platypus is there to save the day.
Phineas and Ferb try to decorate the Tri-State Area as a thank you for Santa Claus, but when Dr. Doofenshmirtz tries to spread naughtiness across the city with his "Naughty-inator," the boys must help restore holiday cheer to Danville. Meanwhile, Candace tries to find out the contents of Jeremy's wish list.
When Phineas and Ferb spin the house in order to paint it more quickly, Candace, inside the house, gets dizzy and collapses. She wakes up in the magical land of Odd and heads down the yellow sidewalk to Bustopolis to meet the Wizard.
Khaka Peü Peü arrives in Danville to challenge Phineas and Ferb after the boys are mistaken as a superhero (while wearing an indestructible suit they designed to safely conquer their newly built extreme skate-track) known as The Beak. With the super villain wreaking havoc, it's up to Phineas and Ferb to thwart him while Dr. Doofenshmirtz tells the people of the Tri-State area that he is in charge, in hopes that they will actually just go along with it. Meanwhile, his brother Roger is worried that everyone will blame him for the recent super villain catastrophe so he decides to make Doofenshmirtz Mayor.
Phineas and Ferb head to the Tri-State area’s annual sci-fi/comic book convention to meet their hero, special effects guru Clive Addison. Their plan gets sidetracked when they’re swept into a duel between fantasy fans and sci-fi geeks. Meanwhile, Candace tries to keep secret that she’s a fan of Ducky Mo-Mo, another convention staple. Across the convention hall, Dr. Doofenshmirtz has taken television executive Jeff McGarland hostage so he can pitch him a show he’s developed, Doof ‘N’ Puss.
The Flynn-Fletcher Family go on a vacation to Hawaii. While they are there, Phineas and Ferb make living sea creatures, Candace find a lava necklace of bad luck, and Doofenshmirtz creates a De-Evolution-inator.
Phineas and Ferb and their friends travel around the world. However, for once, not everybody believes they can achieve what they set out to do. Also, Candace and Jeremy's relationship will be further explored.
A musical in which Phineas and Ferb revisit the day they built a gigantic roller coaster in their backyard. Doofenshmirtz tries to pull the East Coast to the west using tinfoil and a huge magnet.
Ferb's cousins from England challenge him and his friends to a soccer game. The boys build a 3D electronic soccer field. Candace gets an English accent and has to deal with it when Jeremy comes to visit her
During medieval times, Phineas and Ferb (or, Ferb-a-lot) set off on an epic quest to find the legendary sword, Excaliferb, so they can defeat the evil sorcerer, Millifishmirtz.
Meap's world is put in danger and the boys try to help him save the universe when they travel to Seattle. Meanwhile, Doofenshmirtz visits former nemesis Peter the Panda.
The Flynn-Fletchers are off on an African safari, leaving Perry at home to deal with Doofenshmirtz and his most evil plot yet: to take over the O.W.C.A. But when Doofenshmirtz accidentally zaps Carl the intern with his Ultimate-Evil-Inator ray, Carl takes over the O.W.C.A. (Organization Without a Cool Acronym) and imprisons Doof and Monogram. Agent P steps in but gets zapped with Doof’s many rays and in the cliffhanger of all cliffhangers, disappears.
Agent P's fate is finally revealed in the action-packed finale of the two-part television special that left Phineas, Ferb and the gang hanging...literally off an unchartered gorge and Candace frantic over a phone call with Jeremy that left their relationship status in limbo. Now, with Agent P nowhere in sight, Dr. Doofenshmirtz and Major Monogram square off against evil Carl who controls a set of familiar-looking robots to take over the OWCA, in one of the biggest battles yet.
Agent P quickly figures out there is more to Norm's odd reality show that celebrates the eventful life of his creator Dr. Doofenshmirtz, which is recreated through flashbacks and special guests.
Agent P teams up with an estranged former human partner named Lyla to stop a hijacked train to save the train's passengers and Canada's national treasure - a moose named Albert.
Perry comes face to face with an Australian platypus hunter set on destroying him. Baljeet is having an existential emergency and finds himself incapable of making decisions.
Candace brings her plush Ducky to life. Doofenshmirtz encounters a Giant Floating Baby Head. Phineas, Ferb, and their friends confront a horde of evil platypuses.
Doof's latest inator changes the way the Earth moves and it is up to Phineas and the gang to save summer.
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.
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.
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.
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.
After Doofenshmirtz is defeated, a new threat in the 2nd Dimension emerges, leaving it up to Phineas, Ferb, Candace and her resistance fighters to defeat this new foe.
It's the last day of summer and Phineas and Ferb decide to seize the day. Unfortunately for Candace, this means it's also her last chance to bust her brothers... or is it?
In the midst of training three new animal agents, Doof and Perry have a serious falling out.
