Phineas and Ferb construct a roller coaster in the backyard, and Doofenshmirtz tries to reverse the Earth's gravitational pull with tin foil. The boys remodel Mount Rushmore for Candace's 15th birthday, while Agent P stops Dr. Doofenshmirtz from making a tunnel to China.
The boys enter the family automobile in a car race. A tropical beach paradise in the backyard goes awry.
The boys go riding and decide they'd like to be cowboys. Dad gives the boys a snow cone machine and they turn summer into winter in the garden.
The boys have fun learning about Egyptian mummies and decide they'd like their own. In a bid to become the latest singing sensation, the boys enter a competition.
Phineas accidentally spills ice cream on Buford. Candace gets a movie part, but is horrified to discover that Phineas and Ferb are the directors.
While visiting their Grandparents at their mountain cabin, Phineas and Ferb organize a full day of summer camp activities. The boys remodel them and their sister's tree houses while Perry tries to solve the mystery of the missing pigeons.
Phineas and Ferb find a time machine at a museum and travel back to the Jurassic Age. Meanwhile, Perry is sad when Doofenshmirtz replaces him with a new nemesis, Peter the Panda, so he confides in a relationship talk-show host.
Phineas and Ferb make their own circus when the real circus performance is canceled. Phineas and Ferb invent a new Perry the Platypus toy.
When Isabella falls prey to hiccups, Phineas and Ferb gather the kids together to help scare them out of her, using a remote controlled haunted house. Meanwhile, Doofenshmirtz sets out to destroy his mentor's hideout, so that no one could discover his secrets, but not if Perry has something to say about it!
When the family is having its annual holiday with Grandpa in England, the boys hear the story of the Black Knight and decide to hold a medieval tournament. The boys build robots called Phineas and Ferbots, but they soon get out of control.
Phineas and Ferb are on a mission to make their mom's birthday the best ever. The boys try to shrink themselves so they can retrieve Isabella's sash after it was eaten by her dog, but they instead get eaten by Candace.
There's a fashion show at the mall, so the boys become fashion designers. Isabella has her tonsils taken out and is allowed to eat lots of ice cream.
Phineas and Ferb create a monster truck for Candace to practice her driving skills. While camping with the boys, Grandpa tells them about Badbeard the Pirate.
The boys locate their parents' favorite band, Love Handel, to perform a reunion concert in the backyard to make up Dad forgetting his wedding anniversary. Meanwhile, Doofenshmirtz plans a surprise birthday party for his daughter, Vanessa.
Phineas and Ferb stumble upon Perry's secret lair. Candace and Stacey win a day with a girl band, but it turns into a disaster. The boys discover that their Grandpa was a daredevil motorcyclist, so they try to get him to recreate his famous stunt.
Candace has finally busted her brothers, and they are being sent away to a reformatory school to stamp out their imagination! But just how long can Candace enjoy her summer without her usual routine, her family? And speaking of usual routine, where is Perry?
Phineas and Ferb recreate an ancient Greek chariot race. Candace enlists a reality show to help her bust Phineas and Ferb.
The boys build a roller-derby rink so that their grandmother can compete against an old rival. The boys take the day off, to Candace's dismay.
Phineas and Ferb unearth a real caveman who falls for Candace. The boys help Buford retrieve his pet goldfish.
Candace asks Stacey to bust the boys and their new golf course. A teleporter accidentally switches Perry and Candace's brains.
Candace borrows a DVD from a traffic camera to prove to her mother what the boys have been doing. Phineas and Ferb decide to break a record by making the biggest ever bowling ball.
Phineas and Ferb help their friend Django to impress his artist father Beppo by painting the Unpainted Desert. Meanwhile, Dr. Doofenshmirtz tries to impress his old evil science teacher, Dr. Gevaarlijk
The boys help Baljeet with his science project, A Portal to Mars. Candace tries Baljeet's Portal to Mars and finds herself queen of the red planet.
The boys build a rocket ship to get a good look at a star named for them, and Candace accidentally takes a ride with them just as she is trying to find the courage to ask Jeremy to a dance, while Isabella tries her best to do the same with Phineas. Meanwhile, Perry must stop Dr. Doofenshmirtz, who, not only is conveniently in space too, but has created a massive spacestation in an attempt to get revenge on "Huge-Hands-Hans".
Isabella challenges Buford to a sports contest. Candace reluctantly agrees to go to the park with Jeremy and Suzy.
The boys decide to build a studio to make their own cartoons, with Candace as the villain. Doofenshmirtz's brother has been elected mayor, so he builds his own country to rule.
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 create an animal translator in order to understand Perry; The boys put on a concert to raise awareness that the plastic thing at the end of shoelaces is called an aglet.
Candace uses a growth elixir created by Phineas and Ferb in order to become taller for a modelling career; the boys build their new pet goldfish a backyard aquarium.
The boys are inspired by Candace's dessert club to make the biggest ever jelly, but it all goes horribly wrong when the jelly turns evil; Candace emulates Sherlock Holmes to find out what the boys have planned for the London Eye.
Candace attempts to locate where Phineas and Ferb's inventions go after they disappear; the boys open a restaurant called Chez Platypus, which becomes the trendiest place in town.
The boys find an egg and think Perry has laid it, so they build a platypus incubator, but Candace decides to look after the egg. Phineas and Ferb find a way to become part of a video game and drag Candace in too.
When an alien spacecraft crashes in Phineas and Ferb's backyard, they go about repairing his ship. Later, the boys and Isabella are captured by Mitch and it's up to Candace and Meap to rescue them.
A rivalry develops when the neighbor's visiting relatives meet, who are very similar to Phineas and Ferb; the boys are on a mission to build a plane bigger than Howard Hughes' Spruce Goose.
Candace finds out that Jeremy will star in a television commercial, and begins worrying that he will forget about her; Phineas and Ferb help Isabella and the Fireside Girls by building an automatic car wash to help with fundraising to save the starnose mole.
Perry has been relocated to help track a new villain called the Regurgitator, but Candace thinks his disappearance is her fault; the Flynn family takes a trip on a sloop and gets shipwrecked.
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 travel to the future to find a tool that hasn't been invented yet, and run into future Candace. Seeing an opportunity to finally bust her brothers, she follows them back through time to catch them building their rollercoaster, and exposes their antics to her mom. In the process, she accidentally foils Agent P's defeat of Dr. Doofenshmirtz, starting a chain reaction that turns the future into a dystopian society.
The boys use their shrinking machine on themselves so they can fit anywhere; Baljeet asks Phineas and Ferb to help him impress a childhood girlfriend.
Phineas and Ferb form a band with Baljeet at his summer rock camp; Vanessa tries to get a capsule for her father, Dr Doofenshmirtz, to prove she's responsible enough to get her own car.
Candace adopts a stray rabbit, then the boys discover it's a spy; Candace and Stacey are going to a spa for the day, so the boys decide to build their own spa.
The boys and their friends float around town in a giant bubble; Isabella and the Fireside Girls try to get sap from a maracanut tree located inside The Old Abandoned Amusement Park.
The boys try to cheer Candace up after Jeremy cancels their date; the only way Candace can get to see her favorite band in concert is to join the Fireside Girls.
Baljeet saves Buford's life. Buford decides to stop bullying him, but Baljeet can't stand it; Phineas and Ferb help Candace trace her treasured doll, which was accidentally sold in a garage sale.
The boys reconstuct one of Doofenshmirtz's inventions to discover what it does after it lands in their front yard; Phineas and Ferb discover the lost city of Atlantis, Candace enters a sand castle building contest, and Dr. Doofenshmirtz tries to use a growth formula to make plants evil.
Phineas and Ferb create a Go Getter that can transport any item to their backyard, then discover it can transport them too; Candace wants to appear on a live TV dance show, and talks Jeremy into dancing with her.
Candace is taking part in a series of father and daughter competitions, with the help of Doof's robot; Candace babysits Jeremy's little sister Susy, who teaches her how to manipulate siblings.
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 create an anti-gravity device, Major Monogram sends Carl to investigate; the boys encourage the neighborhood kids to build their own floats for the yearly Tri-State Area Unification Day parade.
Phineas and Ferb create an orb that allows its user to pass through objects to help find Linda's guitar pick; when Aunt Tiana and Uncle Bob’s wedding is moved to the Flynn-Fletcher's backyard, Candace hopes that her brothers do not upstage her role as maid of honor.
After watching a sci-fi movie marathon, Candace becomes convinced that Ferb is an alien. Meanwhile, Dr. Doofenshmirtz tries to market an evil invention by claiming it to be a cleaning device. / The boys trick out the kiddie rides at a store, Dr. Doofenshmirtz tries to burn his name into the atmosphere.
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.
Irving convinces Baljeet and Buford to pose as Phineas and Ferb so he can prove to his brother that he isn't lying; Candace, Stacy, and Jenny team up to try and bust Phineas and Ferb together.
Phineas and Ferb find a chameleon and call it Steve. Jeremy accidentally operates the Gigantinator, making Steve dinosaur sized and terrifying the locals. The boys build mechanical bulls and want to have a robot rodeo.
Phineas and Ferb build an all terrain vehicle while Candace is at a leadership retreat; The boys attempt to make Danville famous by building the world's tallest building.
Candace wins a competition and becomes the Mayor of Danville for the day; Phineas and Ferb build the ultimate lemonade stand, and start to sell franchises.
Phineas and Ferb build a life-sized maze full of fun obstacles in the backyard; Linda is invited to perform at a Lindana reunion, and the boys turn their dad into a rock star for the occasion.
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.
Candace stands in front of a ray, gets zapped and it splits her into two personalities; The boys are home with colds so they decide to make it the best sick day ever.
Candace swaps places with a princess who looks like her, but can't enjoy her new lifestyle because of her brothers' antics; Candace invites some friends over while her parents are away, and it gets out of hand as it slowly turns into a party.
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.
Phineas and Ferb's newest invention is a pair of boots that make the wearer extraordinarily fast. Candace decides to wear them so that she can be in two places at once; at Jeremy's family picnic, where she runs into Mrs. Johnson, and also at the library where she promised Mom she would read to the kids. Meanwhile, Dr. Doofenshmirtz's building is put up for sale so he tries to convince a prospective buyer, Annabelle, who turns out to be a long lost relative of the Johnson family, that it is not worth buying. / While visiting their grandparents, the kids decide to create and race a giant hot air balloon. Meanwhile, Candace is inspired by train engineer Glenda's can-do attitude and decides to "give up" on busting her brothers. On the other side of town, Dr. Doofenshmirtz finds a Dodo bird egg and is convinced that it is a fierce bird-monster that can help him take over the Tri-state area, but discovers the exact opposite when the egg hatches.
The third season begins with Phineas and Ferb building a gigantic biome during a bit of bad weather to help Isabella earn a Fireside Girl patch. / Candace realizes that she needs to spend more time with Stacy, so she vows to spend the whole day with her only. But while visiting Jeremy and his mom, Mrs. Johnson, Dr. Doofenshmirtz's "combine-inator" zaps her and Jeremy, literally joining them at the hip. Meanwhile, Phineas and Ferb build a giant robot dog that causes a lot of mischief.
For Harbor Days Festival, Phineas and Ferb celebrate by creating a mechanical version of the historical elusive shark of Danville Harbor. Seeing what the boys are up to, Candace enlists some help to capture the mysterious shark. Meanwhile, Dr. Doofenshmirtz invents the 'Salt Water Taffy-inator' to give cavities to every kid in the Tri-State Area. / Inspired by the lost verse from the nursery rhyme, "Hey, Diddle Diddle", the boys decide to take some cows to the moon to see if its low gravitational pull actually does produce the best tasting ice cream ever. Back at home, Candace decides to take advantage of the boys being gone and attempts to make a fancy dinner for Jeremy, but her lack of cooking skills don't add anything to the plate. Meanwhile, Dr. Doofenshmirtz attempts to use his 'Moisture Suck-inator' to turn his neighbor's plants brown, so that his plants will be greener by comparison.
It's Phineas' birthday and for the special occasion, Ferb puts together a clip show of the gang's favorite moments. Meanwhile, Agent P has to stop Dr. Doofenshmirtz from using his 'non-inator' to pre-empt his brother's biography from appearing on television.
When Candace discovers that Phineas and Ferb have invented a computer that can answer anything, she asks it how she can finally bust her brothers once and for all. Meanwhile, Dr. Doofenshmirtz loses the key to his latest invention, the "All Purpose-inator," and Agent P must find it before he does. / Perry misses his 100th battle against Dr. Doofenshmirtz when Candace takes him to the Charity Pet Wash with her. Perry's absence goes unnoticed when the zookeeper's typical platypus at the Danville Zoo stops Dr. Doofenshmirtz's plan to zap his brother with his "Least Likely-inator." Meanwhile, the boys build a fun house Phineas and Ferb style.
Candace has no choice but to go to her brothers for help after she loses her phone for the fifth time. Unbeknownst to her, the phone that they invent for her has a voice activated phone transfer app that sends her to Easter Island. Meanwhile, back at Evil Inc., Dr. Doofenshmirtz invents a "Pick 'Em Up-inator" to pick Vanessa up from class so that he can deal with Sarcastic Norm Head, the Norm head prototype that has an affinity for sarcasm. / Inspired by Dad's favorite childhood program, the boys decide to create a magic carpet, and Candace is convinced that fortune cookies will lead her to bust her brothers. Meanwhile, Dr. Doofenshmirtz plans on ruining his brother's art unveiling by using his "Stain-inator" to ruin a mysterious painting, but as it turns out, the painting is Dr. Doofenshmirtz's very own masterpiece that he created when he was a youth back in Gimmelshtump.
Candace gets a bad haircut and must rely on Phineas and Ferb's hair growing machine to correct it before she attends the Endangered Animal Benefit with Jeremy and his mom. However, when Candace turns up the power, her hair grows much more than expected and she is mistaken for a rare tangerine orangutan. Meanwhile, Dr. Doofenshmirtz is developing his Very, Very 'Bad-inator.' / Mom joins Jamie Oliver as one of the judges for Danville's Meatloaf Festival Cook-off, as he stresses healthy eating and fresh ingredients. Meanwhile, Candace puts a bid on a prized souvenir resembling band members Nigel and Adrian from her favorite band, Tiny Cowboy, at the Rock and Roll Memorabilia Auction, but gets distracted when her brothers build a bounce house in their backyard. On the other side of town, Dr. Doofenshmirtz has plans to enter his family meatloaf recipe into the competition using "evil" as the special ingredient.
It’s the Stone Age and Phineas and Ferb are cavemen who decide to invent something new, fun and useful…the wheel! Meanwhile, Dr. Doofenshmirtz attempts to make his digs more upscale by using the precursor to the Inator device... a plain old stick. / In ancient feudal China, Princess Isabella is part ruler and Master Perry has given up the way of the warrior. After Phineas and Ferb witness Doofus Khan capture the Princess and take her as a prisoner, they track down Master Perry and convince him to teach them his warrior ways so they can rescue Princess Isabella and save China.
When Mom tells Candace she wants to spend the day with her, Candace spends the entire time with her in the backyard so that she can bust her brothers. Unfortunately, Phineas and Ferb's grand plan for the day only entail watching the grass grow after getting zapped by Dr. Doofenshmirtz's Dull-and-Boring-inator earlier that day. Meanwhile, Agent P partners up with Dr. Doofenshmirtz to fix the now destroyed Dull-and-Boring-inator into a Dynamic-inator in order to fix Phineas and Ferb. / When Dr. Doofenshmirtz thinks Vanessa overhears him say he would rather have a son to do his evil bidding, he feels terrible so he intends to zap her with the "Forget-about-it-Inator."
After Candace injures her ankle and is told to stay in bed, she drives herself crazy trying to get her Mom's attention in order to bust her brothers. Fortunately, Phineas and Ferb provide her with a box of items to stave off her boredom. However, it ends up being more of a hindrance, until she unknowingly helps the boys warn their cosmonaut friend about a dangerous obstacle approaching them. Meanwhile, Perry interrupts Dr. Doofenshmirtz's Chicken Soup themed escapade. / On the last day of the Flynn-Fletcher family road trip, Candace thinks she’ll finally have a couple of hours to relax and not worry about busting her brothers. However, Phineas and Ferb decide to build a truck stop diner on top of the RV. Meanwhile, Doofenshmirtz is also doing a road trip, but he’s using a big rig to transport his boom juice across the Tri-State Area.
Phineas and Ferb build a giant version of a favorite childhood game, with Danville as the central location. Meanwhile, Doofenshmirtz takes Vanessa on a camping trip. / Phineas and Ferb enlist the help of cyclist Greg LeMond to help Baljeet compete in a bicycle race. Meanwhile, Doofenshmirtz tries to bring the city to a standstill so he can bid on an auction unopposed.
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
The executive of Totally Tools oversees a contest to find the company’s "spokesanimal," and Perry is crowned the winner. However, the victory puts Perry's secret identity in jeopardy, forcing Major Monogram to appoint Agent S as a temporary replacement, but when Dr. Doofenshmirtz sees his new nemesis is Sergei the Snail, he mistakenly underestimates his new opponent. Meanwhile, Candace has been welcomed into Mandy’s "Stop the Busting" retreat, which aims to teach Candace to control the urge to bust her brothers through positive reinforcement. / When Lawrence heads out to attend a speaking engagement on antiques, he unwittingly finds himself participating in the L.O.V.E.M.U.F.F.I.N. Pageant of Evil against Dr. Doofenshmirtz and Rodney.
It's Halloween night and the kids encounter a strange boy named Russell who is convinced his house is haunted. Meanwhile, Dr. Doofenshmirtz's disdain for grass causes him to invent a "mind-transfer-inator" enabling him to merge minds with a cow and destroy all the grass in the Tri-State Area. Unfortunately, his plan backfires and he transforms into a scary "were-cow" that wreaks havoc any time there is a full moon. It's now up to Agent P to stop him and save Danville. / Candace is bitten by a bat after watching a popular vampire movie with Stacy and worries that she is becoming a vampire. Phineas and Ferb's latest gadgets lead Candace to believe that she has indeed made the change from teenager to teen vampire. Meanwhile, Dr. Doofenshmirtz plans to change the Tri-State Area into a carbon copy of Gimmelshtump so that it will be easier to take over.
When Phineas and Ferb are inspired by an antique escape chamber that Dad acquires, they decide to build a computer-controlled tower that will trap them inside and allow them to explore the world of escapement. Meanwhile, Dr. Doofenshmirtz invents a "Rude-Inator" to ruin Roger's meeting with a visiting dignitary from England. / Craziness has ensued in Danville and no one has any idea what’s going on. The wackiness unfolds when Phineas and Ferb create Cheesetopia, Doofenshmirtz makes Perry his butler with his Butler-inator, and Carl is trapped by Doof while in a squirrel costume. All is explained, in an episode of Phineas and Ferb that starts at the end and works its way back to the beginning.
Phineas and Ferb create their own language, Ferb Latin, which quickly catches on. Unfortunately for Candace, she awakes from a massage puzzled to find everyone else speaking a language she doesn't understand. Meanwhile, Dr. Doofenshmirtz decides to use propaganda as his new "-inator," believing that it will work since people will believe anything they read. / Potato gremlins appear all over town when Phineas and Ferb clone a potato chip from Buford and it mixes with his DNA; Doofenshmirtz tries to summon the Spartan army with his historical army retrieve-inator.
The boys decide to put on a traditional family Christmas special featuring their family, friends and a few very special guests, including Grammy winning recording artist Kelly Clarkson. The episode features three new holiday songs - Isabella's "Let it Snow," a Buford and Baljeet rendition of "Good King Wenscelas," and the whole gang singing "We Wish You a Merry Christmas."
When the boys learn that the famous Crikey the Crocodile has gone missing, they set out to find and return him to his home at the Danville Nature Preserve. Meanwhile, to Candace's amazement, Irving reveals his digital scrapbook compilation of all of Phineas and Ferb's wild creations, and guest star Ray Liotta fills in for Major Monogram to give Perry his mission. Also, Dr. Doofenshmirtz plans to embarrass his brother by using his 'Chicken-Replace-inator' to replace Roger's mayoral award with the nearest chicken. / Phineas and Ferb create their own TV shows and commercials.
When Phineas and Ferb can’t find Perry, they decide to create the Perrytronic 3000, a mechanical structure that can assume any form. Of course, being aware of the boys’ every move, Candace decides to take a different tactic on her busting approach by using a new technique that keeps Phineas and Ferb from finishing their Perry project. Meanwhile, Doofenshmirtz invents a Duplicator-Inator-2 so that he can duplicate his own head and make himself twice as smart. / With Fall around the corner, Phineas and Ferb decide to invent "S'Fall," a colorful world full of giant leaf piles and gourds. Meanwhile, over at Evil Inc., Dr. Doofenshmirtz is mentoring Rodrigo, a budding student of evil. Unfortunately, Rodrigo truly is evil, and when he captures Dr. Doofenshmirtz and Agent P., it’s up to Major Monogram's son, Monty, to save the day.
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.
After losing a gift that Jeremy made for her, Candace is determined to recreate it before Jeremy realizes it’s missing. Unfortunately, Candace can’t remember what it looks like, so she enlists Phineas and Ferb to use their mind machine to enter into her subconscious and recapture the memory. Meanwhile, Doofenshmirtz’s evil plan is to use his Underwear-Inator to take over the Tri-State Area, since everyone's greatest fear is being caught in public in their underwear. / Thinking it would be cool to be part of an ant society, Phineas and Ferb create and infiltrate the Antius Maximus, a massive ant farm filled with giant ants. Suspecting that the boys are up to something, Candace accidentally drenches herself in the ant pheromones and follows them inside. Meanwhile, Doofenshmirtz feels tired and lethargic after eating turkey and decides to create a Turkey-Inator that will create a sleeping epidemic in Danville by turning things into giant irresistible turkeys.
Candace's plans to watch over Phineas and Ferb backfire when Dr. Doofenshmirtz's "Babe-inator" turns her brothers into babies. After having an epiphany, Dr. Doofenshmirtz shows up at the OWCA to give up his evil ways. Agent P has no choice but to show Dr. Doofenshmirtz the ropes of the trade, but things quickly sour between the two after Dr. Doofenshmirtz accidentally exposes the identity of a fellow animal agent. / After locating and retrieving the Amulet of Juatchdoon, adventuring archeologist duo Ohio (Phineas) Flynn and Rhode Island (Ferb) Fletcher set off to South America to help Damsel in Distress Isabella find the Lost Temple of Juatchadoon and her missing mother. However, Dr. Doofenshmirtz has other plans for the amulet - to awaken the evil corn colossus to give him the power to destroy the world.
Paul the Delivery Guy discovers his job has a higher calling to save Danville as he makes stops at Phineas and Ferb's house, Doofenshmirtz Evil, Inc., Danville City Hall and the OWCA, in a special episode seen through his eyes. The rock band, Love Händel, returns for some musical accompaniment. Meanwhile, at Doofenshmirtz Evil Inc., Perry has lost the tools in his hat. / Inspired by Ferb's personal anti-gravity device, Phineas thinks it would be fun to suspend trampolines all over Danville.
After Mom asks the kids to keep quiet while she prepares for her online knitting test, Phineas and Ferb create ninja outfits designed to hide the wearer from anyone who is not wearing them. Meanwhile, Candace becomes increasingly frustrated after she can’t find the boys and bust them. Across town, Dr. Doofenshmirtz invents the De-Handsome-Inator. / Baljeet announces that he is no longer Buford's nerd, and Buford is heartbroken.
When Mom is out of Doonkleberries for her famous Doonkleberry pie, the boys set out to find some for her. Meanwhile, Perry and Dr. Doofenshmirtz find themselves across the ocean as Doofenshmirtz returns home to renew his Druesselsteinian driver’s license. Back in Danville, Candace is convinced she has discovered the answer to her busting problem. / Brigitte, Josette, and Colette, the visiting Fireside Girls from France, help Isabella capture the American Grizzly Bear, one of the world's most dangerous creatures. Buford's plan to jokingly dress up as the bear backfires when he discovers the identity of Brigitte, throwing him off his game. Back at their grandparents' cabin, Phineas and Ferb create the most amazing "run-through-the-sprinkler" experience. Meanwhile, Dr. Doofenshmirtz's loathing of pretzels drives him to create the "De-Twist-Inator" to untwist every pretzel in Danville.
Candace's plans to hang out with Jeremy are derailed after he becomes interested in playing Phineas and Ferb's newest game, jet pack volleyball. Meanwhile, when Dr. Doofenshmirtz discovers he invents "-inators" in his sleep, he decides to go back into his dreams to find out what is happening. / Phineas and Ferb create their own flying saucer to help solve the mystery of a recent rash of crop circles. Meanwhile, Candace tries to give up her tattling habit by taking a "me" day, and across town, Dr. Doofenshmirtz challenges the local pizzeria's "37 Minutes or it's Free" rule by using his "dough-blow-inator" to generate a powerful current of air to hold the pizza dough aloft indefinitely.
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.
When the boys ask Candace to decide what they should do for the day, she slyly asks them to invent a device to attract their Mom so that she can finally bust her brothers. Meanwhile, Dr. Doofenshmirtz has invented a "Baby-Cry-Inator" designed to tarnish his goodie-two-shoes brother's image with the electorate. / When Baljeet becomes concerned that he is losing his mental edge, the boys invent a cerebral stimulatory hat, or "Brain booster," to help him. But when the hat exceeds expectations and makes Baljeet exponentially smarter, he suddenly views everyone else as beneath him and becomes a threat to civilization by taking Earth's atmosphere and bringing it to the moon. Meanwhile, Dr. Doofenshmirtz plans to use his "Key-Find-Inator" to collect all the keys in Danville in hopes that it will lead to the Key to the City.
Candace tries to bust Phineas and Ferb when they put on an enormous backyard magic show, while Vanessa and Major Monogram's son Monty get coffee together despite their warring fathers. Meanwhile, Dr. Doofenshmirtz tries to become hip in an attempt to get youthful followers. / The guys help their dad unearth a missing piece of Danville history; Doofenshmirtz tries to make himself younger to win a children's film festival.
Candace accidentally turns into a fluid when she comes into contact with a device that turns solids into liquids. Meanwhile, Doofenshmirtz turns himself into a platypus to defeat Perry in battle. / Candace finds it difficult to bust Phineas and Ferb when her brothers build nanobots that can assemble into any object they can imagine. Meanwhile, Dr. Doofenshmirtz has jury duty, so Norm takes over the day’s evil scheme -- to destroy Danville by using weapons.
After discovering that a strange planet is hurtling directly towards Danville, Phineas and Ferb set out to avert a disaster, while Buford looks forward to making contact with its alien race. Meanwhile, Dr. Doofenshmirtz hopes to steal the world's largest ball of twine. / When one of Dr. Doofenshmirtz's "-inators" zaps him and Agent P into the middle of nowhere, they must embark on a comical journey filled with twists and turns to return home.
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.
Candace is put in charge of Phineas and Ferb just before they seize the opportunity to make the most of Danville's electricity blackout; Phineas and the gang introduce Ferb and Perry to their newest project - training domesticated squirrels to live in the wild.
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.
Buford removes a part from a tire swing the boys are building and it accidentally shoots a ray that turns Candace into a fly. Meanwhile, Doofenshmirtz is suffering from evil scientist’s block. / It's time for Danville's Doo Wop Hop and car show and the whole town is getting prepped for it. Doofenshmirtz is set on winning the show even if it means using his Rust-inator to turn all the other cars into red dust. Meanwhile, Candace's hope for a car of her own has come true, but it's not quite all she imagined.
National Hockey League star Luc Robitaille offers his assistance when Phineas and Ferb take an ice hockey game to the extreme. Meanwhile, Doofenshmirtz build an Abominable-inator to make himself bigger, scarier and hairer. / Phineas and Ferb plan their own New Year's Eve ball drop, complete with a customized multi-dimensional ball, while Candace makes it her resolution to refrain from busting her brothers before the clock hits midnight. Meanwhile, Doofenshmirtz uses a Resolution-Changer-inator in his tie as he continues the never-ending attempts to take over the Tri-State Area.
Candace challenges Buford to keep Phineas and Ferb’s invention from disappearing so that she can sweep in and casually bust her brothers. Across town, Doofenshmirtz has had one too many lattes and is experiencing an extra burst of evil energy. / The boys create a new invention using recycled parts from past projects. When Candace attempts to bust them, Mom is too exhausted from baking pies all night and can't figure out what Candace is trying to show her.
The boys create Rutabaga-themed vehicles when Candace is chosen to be Rutabaga princess and gets to start the "Running of the Chinchillas." Across town, Doofenshmirtz plans to turn himself into a real live Kinderlumper to scare Roger into relinquishing control of the Tri-State Area over to him. / Phineas and Ferb build a wall for climbing. Candace is recording a Fireside Girls book with Irving and loses her voice. Meanwhile, Dr. Doofenshmirtz creates the Just-Desserts-inator.
The boys make a giant inflatable wading pool for Mom. Candace reveals her "Emo" side. Doofenshmirtz attempts to become ruler of all bees. / Isabella and the Fireside Girls turn themselves into bees. Poofenplotz tries to become Queen of the World by stealing and consuming massive amounts of royal jelly.
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.
Candace thinks she can trap the boys at last when they ask her to call Mom if they get stuck in their giant Gordian Knot, but is distracted by helping Jeremy open his mini-safe. / The gang switches bodies with alien tourists for a free intergalactic vacation.
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.
The boys set out to prove the existence of the elusive Chupacabra to the world, but Candace can't stand the wait and needs to first just prove it to Mom. Meanwhile, Doofenshmirtz has the brilliant idea to use his Switch-Place-Inator to remove hair from one person and give it to another so that he can in turn sell his hair growing tonic. / Phineas and the gang celebrate Isabella's birthday in a big way, but all she really wants is some quiet time with Phineas. Meanwhile, Doofenshmirtz has installed his Bugs Me-Inator onto an evil bug bus and is driving around Danville turning all the things that bug him literally into bugs.
When Candace thinks Jeremy is bored with their usual hangouts, she sets out to find something unique to do with him. Meanwhile, Phineas and Ferb power through town surfing on a giant ball of water and Doofenshmirtz plans to use his Double-Negative-Inator to confuse his local eatery into giving him a wintery drink that is usually not served during summer. / 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.
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.
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. / Inspired by Candace's book club selection, The Iliad, the boys reenact the Trojan War -- but with a Phineas and Ferb twist. Meanwhile, Perry discovers that Doofenshmirtz has a major problem with throwing things away so he helps him find his De-Clutter-Inator.
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. / Candace and Stacy compete in Phineas and Ferb’s Ultimate Obstacle Course. Doofenshmirtz plans to humiliate his brother, the Mayor.
When Candace is stumped about what to get Jeremy for his birthday, she reluctantly asks Phineas and Ferb for their help in creating the ultimate gift. Meanwhile, Doofenshmirtz plans to make fears a reality with his Worst-Fear-Inator, but his plans backfire when he finds himself battling his own fears instead. / When Candace is accidentally zapped by Doofenshmirtz’s Stinkelkrampen-Inator (aka Good Luck-Inator), she realizes she has a good chance of busting Phineas and Ferb.
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. / 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.
When Phineas and Ferb discover a commemorative coin from the 1903 Danville World’s Fair, Lawrence recounts the events of the festival to them, in which steam-driven devices were introduced and a set of kids, who were very much like them, were preparing for the highly anticipated event. / 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.
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.
Phineas and Ferb deejay at Vanessa's Halloween party. Doofenshmirtz hunts for hidden treasure in a castle. / After studying hours of horror movies, Doofenshmirtz develops a theory that enlarging small, cute animals into giant beasts will help him take over the Tri-State area. But when he puts his plan into action, he soon realizes it might be too much for him to handle. Meanwhile, Phineas and Ferb make a giant revolving foam city so they can safely perform skateboarding tricks, and Candace's tour of the Danville Space Laboratory gives her an opportunity for a high-tech bust.
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.
After facing the choice of imprisonment or community service, Doof becomes a teacher at Vanessa's school. Meanwhile, a trio of bugs embark on a journey to become the first insects to communicate with humans. / Perry helps Doof in retrieving his father's old lawn gnome. Meanwhile, Phineas and Ferb help out their father on Father's Day
Isabella unintentionally admits her feelings for Phineas in a letter. Meanwhile, Doof invents an inator to help change his misfortune / Candace is accidentally hit by the Impersonator-inator which changes her appearance to a pizza delivery guy, but uses this appearance to help her better understand boys.
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.
Doof gets rogue OWCA agent Dennis the Bunny to escape prison. Meanwhile, Phineas and Ferb make some improvements on the Fireside Girls' marionette show. / 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.
Doofenshmirtz gets kidnapped by Professor Mystery, and Phineas and Ferb discover a giant time capsule that fell from the sky. / Doofenshmirtz teaches an Inator Method seminar.
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.
Doof's latest inator changes the way the Earth moves and it is up to Phineas and the gang to save summer.
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.
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.
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?
Dr. Doofenshmirtz and Major Monogram have their hearts set on revealing the top 10 musical numbers from Seasons 2 and 3, but soon find out that celebrity host Kelly Osbourne has been brought in to fill the role. Unwilling to submit to playing second fiddle, Doofenshmirtz makes it his mission to thwart Kelly until Perry the Platypus sets out to stop his nemesis from ruining the entire show. Maia Mitchell ("Teen Beach Movie") also guest stars.
In the midst of training three new animal agents, Doof and Perry have a serious falling out.
The boys decide to ramp up their local summer block party with supersized attractions; the kids work to save Mom after she is hit by Doof's inator.
The kids build a giant submarine sandwich submarine while Doof steals food; Candace tries to bust the boys while taking her driving test, and Doof causes chaos in traffic.
The boys build an endless ice luge to beat the heat while Doof brings oil to a waterpark; Candace and Doof see the same psychologist, who thinks their experiences may be connected.
The boys build a giant zoetrope that goes on an adventure of its own; the kids build a massive bookcase that gets attacked by an army of Doof-plants.
The boys bring Perry to the vet for a checkup and build a pet wash while they wait; Carl tries to help Perry stop Doof while working three other part-time jobs.
The Flynn-Fletchers take a cruise while Doof steals shrunken goods; Isabella struggles to lead the Fireside Girls on her own while Doof renews his evil business license.
Candace puts Mom in a Candace costume in hopes that she'll finally see the boys' invention; Stacy takes on an agent role with OWCA to rescue Perry from some evil scientists.
After Doof turns into a Mothman and eats Perry's hat, they pay a visit to the OWCA Haberdasher; the boys build a space adventure film set to help Baljeet learn to act.
Meap enlists the kids to help bust his nemesis, Mitch, before he can steal a long-lost treasure hidden somewhere on Earth.
The kids and Candace each have a sleepover party on the same night; the kids build a western town while Agent P is captured by Doofenshmirtz's swamp-dwelling cousin, Bubba Doof.
Buford’s Candace suit comes to life and tries to take over the real Candace’s life; Candace ignores her brothers for a day in order to help her Mom with a bust of her own.
Vanessa and Doof travel to Drusselstein while the boys dig for Mom’s lost wedding ring; the kids build a bird mansion for a rare macaw while Doof deals with giant praying mantises.
