Mens deres mor er ude at handle, bygger drengene en rutschebane. Dr. Doofenshmirtz og Perry kæmper på grund af doktorens onde plan om at skubbe jorden ud af dens bane.

Phineas og Ferb's nyeste baghave projekt er at skabe et tropisk strand paradis. I mellemtiden, forsøger Perry at stoppe Dr. Doofenshmirtz plan om at stjæle alle havenisser.

Phineas og Ferb beslutter at lave et one hit Wonder: Phineas og Ferb-Tones, og Candace får chancen for at synge med dem. I mellemtiden må Perry stoppe Doofenshmirtz gigantiske robot - forklædt som vikar.

Phineas og Ferb melder familiens bil til i et racerløb, mens Candace prøver at fange dem og imponere Jeremy. I mellemtiden må Perry stoppe Dr. Doofenshmirtz fra at punktere alle oppustelige objekter i Trekantsområdet.

Når instruktøren går væk fra sættet, overtager drengene skabelsen af en film, der er udstyret med Candace, ændre temaet fra en britisk periode til et stykke om et monster. I mellemtiden Doofenschmirtz bruger en ny ældning maskine han har skabt at alder nogle gourmet ost.

Bokseren Evander Holyfield tager Phineas og Ferb til en boksekamp med en bølle.

Mens familien besøger Mount Rushmore, planlægger drengene en overraskelse for Candace på hendes fødselsdag.

Phineas og Ferb kloner sig selv så de kan færdigøre flere projekter mens Doofenschmirtz svæver over sign kærestes hus med en kæmpe magnet for at slette de skøre meddelelser på hendes telefonsvarer, for at kunne lægge nogle nye.

Candace becomes a model, and is forced to wear outfits designed by Phineas and Ferb while Doofenshmirtz designs a machine to create clones of himself, to avoid having to wait in line.

When Doofinshmirtz unleashes his army of termites to eat all the wood in the tri-state area, Phineas and Ferb use their newfounded love of a cowboy life to herd the stampeding cattle back to the carnival, but with Agent P stuck in a room filling with lava, how will he survive?

The boys use a sno-cone machine to create a Winter paradise during the middle of Summer in their backyard, Candace tries to pursue Jeremy (who thinks dropped her for a Swedish exchange student), and Doofenshmirtz tries to melt chocolate with a machine made from laser pointers.

Drengene bruger en snemaskine til at skabe et vinterparadis i deres baghave midt om sommeren. Kandis prøver at forfølge Jeremy (som hun mistænker for at have droppet hende til fordel for en Svensk udvekslingstudent), og Doofenshmirtz prøver at smelte chokolade med en maskine lavet af laser pointers.

Phineas and Ferb visit an Egyptian-themed movie theater and attempt to get a mummy of their own, but they end up capturing Candace, who is wrapped in toilet paper, while Doofenshmirtz tries to raise the city's water level so his real estate will become beachfront property.

Ferb and Phineas accidentally discover Perry's secret lair and are thrust into a spy mission of their own. Meanwhile, Candace travels on a tour bus with a girl band called "The Bettys"

Phineas and Ferb make the biggest ice cream maker for Isabella after her tonsils are taken out. Doofenshmirtz's daughter, Vanessa, spends the day at his lair and tries to convince his ex-wife that he's evil.

Baseret på det faktum at et næbdyr ikke laver ret meget, laver Phineas og Perb en trælegetøjsversion af Perry for at sælge den til et legetøjsfirma. I mellemtiden tager den rigtige Perry afsted for at stoppe Doofenshmirtz fra at lave trekantsområdets store mur og sætte toldanlæg op ved den eneste udgang.

Candace and the boys visit their grandparents at a lake house and the boys try to scare her with a fake Bigfoot while Doofenshmirtz goes out on a date and Perry gets ends up in the middle of it.

Phineas og Ferb laver en monster truck til Kandis så hun kan øve sig til sit kørekort. Imens forsøger Dr. Doofenshmirtz at finde investorer til sin linje af monster trucks der faktisk er monstre, med et trumfkort til udrydelse af konkurenterne.

Candace plans a special birthday for Mom, and even a song, but Phineas and Ferb are always getting in her way of what she planned, unintentionally topping everything. Meanwhile, Doofenshmirtz creates a shrinking machine that will make whatever he hates implode.

When the boys build a shrinking submarine to retrieve Isabella's sash from Pinky's stomach, they end up in the wrong place.

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.

The boys and Candace hatch a plot to reunite their mom and dad's favorite band for a wedding anniversary concert.

Phineas and Ferb build super tree houses for themselves and Candace, but things get a little out of hand when a treehouse fight instigates. Meanwhile, Dr. Doofenshmirtz plans to ruin a ceremony in his brother's honor.

Drengene tager ud på et sørøvereventyr efter at have lært om en mystisk pirat fra deres bedstefar. Imellemtiden udspionere Kandis Perry og Dr. Doofenschmirtz, men er det hele bare fantasier?

Efter at have lært om det gamle Grækenland laver drengene et stridsvognsløb gennem byens gader. Imellemtiden laver Dr. Doofenschmirtz en gigantisk robot ved navn Norm, der skal gøre det af med Perry en gang for alle.

Kandis bruger et reality show til hemmeligt at filme sine brødre bygge en white-water rafting tur. Imens må Perry knuse Doofenshmirtz' drøm om at blive tryllekunstner og dominerer trekantsområdet.

Phineas and Ferb set up a roller derby rink for Grandma Betty Jo.

I Den bedste lav-ingenting-dag. Flipper Candace fuldstændig ud når hendes brødre bestemmer sig for at spendere hele dagen med at lave absolut ingenting.

While on an archaeological dig, the boys discover a caveman who falls in love with Candace, who is dressed as a cave girl for costume party. Then, Phineas and Ferb assist Buford in locating his missing goldfish.

When Buford's goldfish goes missing, the boys help him find it out at sea. Meanwhile, Dr. Doofenshmirtz tries to destroy a tape of him 'saving' a kitten from a tree.

Phineas, Ferb, og Kandis tager til reneseance festival og Phineas og Ferb får Kandis til at deltage in en ridderturnering.

Perry wants to destroy footage from a traffic camera to keep his identity a secret, as Candace tries to use the film in hopes of proving her brothers create unusual stuff. Then, the guys decide to build the largest bowling ball and pins in the world, while Doofenshmirtz wants to rid the world of rainbows.

Phineas and Ferb build the world's largest bowling ball and pins. Meanwhile, Doofenshmirtz wants to use his latest invention to freeze the Tri-State Area so the people will buy his hot chocolate.

The guys decide to hold a competition between the girls to see which are better at sports. Also, the build a telescope in the backyard. Then, Jeremy's sister is tormenting Candace. Doofenshmirtz wants to be the winner of a dog show, and makes an attempt to liquefy a steak.

The boys build a telescope, while Doofenshmirtz tries to liquify steak. Meanwhile, Candace has another encounter with Jeremy's younger sister, Suzy.

Phineas and Ferb create the world's largest golf course, and since Candace is sick, she asks her best friend Stacey to bust the boys for her.

Phineas and Ferb create a teleporting machine, but it ends up switching Candace and Perry's brains.

The boys are helping Ferb's grandfather live his life long dream - to jump a gorge in his motorcycle, the Holy Mackerel. Meanwhile, Perry sets out to stop Dr. Doofenshmirtz from exacting another petty revenge that dates all the way back to the sandbox.

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!

The boys learn about one of Ferb's Victorian ancestors, who helped a scientist create a monster. Meanwhile, Doofenshmirtz recalls the story of his great-great-grandfather Dr. Jekyll Doofenshmirtz.

When Django feels down for not being able to draw art on the same scale as his father, Phineas and Ferb get some big ideas for his piece and the famous "unpainted desert". Meanwhile, Perry faces off against Doofenshmirtz, as he does his best to impress his visiting evil professor.

The boys create a cartoon and cast themselves as superheroes and Candace as the villain, while Perry attempts to defeat Doofenshmirtz, who has taken control of the power of dance.

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".

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 og Ferb hjælper Baljeet med at bygge en portal til Mars til sommerens specielle videnskabsmesse. Kandis konkurrere med en anden pige om at få et job hos Mr. Slushy Burger. Imellemtiden bygger Doofenshmitz en natronvulkan i endnu et forsøg på at kompenserer for sin pinlige barndom, hvor vi også lærer hvor -inator suffiksset kommer fra.

Kandis tror at alle er ligeglade med hende, og træder derfor hurtigt gennem Baljeet's portal til Mars, hvor hun hurtigt tilbedes a Marsboerne. Imens hjælper Perry Doffenshmirtz med at bygge hans onde opfindelse for hurtigere at kunne stoppe ham.