Watch Phineas and Ferb Online Free - Full Episodes

While in London, Candace and Stacy decide to take a page out of Sherlock Holmes'…entire collection, to figure out what Phineas and Ferb have planned for the London Eye. Meanwhile, Perry must team up with British agent 00 Zero in order to stop Dr. Doofenshmirtz from moving Big Ben to the Tri-State Area.

When Phineas and Ferb get inspired by Candace's dessert club to create the biggest piece of gelatin ever, even Jenny and Stacy want to join in. Meanwhile, Doofenshmirtz has a horrific plan, to turn Perry evil!

Phineas and Ferb have a new pet, Goldy the goldfish, and to help make Goldy feel less lonely, Phineas and Ferb have built an aquarium with many other creatures. Meanwhile, Perry must stop Doofenshmirtz from a food related childhood revenge story.

Phineas and Ferb create a slow reacting growth potion to help Baljeet with his "giant" watermelon, but Candace decides to use it for herself, when she finds that she's a little too short to be a flawless girl. Meanwhile, Perry must stop Doofenshmirtz from his most disgusting plan ever!

Curios as to what Perry's chirping sound really means, Phineas and Ferb create a "Perry Translator". But they soon find it's not just bound to translating platypuses, platypi, platypeople? Meanwhile, Perry himself is caught in a plan involving a shark cage that is half off, a remote to open the dam, complicated acronyms and the high tech BO-AT.

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.

When the daily crossword puzzle brings one of the worlds most useful, yet under-appreciated inventions to Phineas and Ferb's attention, the boys set out to bring the plight of the shoelace tip, the "aglet", to the worlds attention, with their only obstacle being Candace, who relentlessly wishes to convince everyone that it doesn't matter, even when she tries to use their campaign to become an insta-star. Meanwhile, Perry's new mission is to erase Doofenshmirtz' viral video, however this time, it seems both he and Heinz have the same goal, even if Doofenshmirtz wants to take it to a slight extreme

When Doofenshmirtz's brother Roger is elected mayor, he decides to build his own country, where he can rule over everything, but how will he stop him when Perry is having trouble entering his hideout? Meanwhile, Phineas and Ferb, in an attempt to help Isabella see her "first" rainbow, create the Rainbow-enator, which harnesses the power of their breakfast cereal to make the light show. The strangest anomaly of the episode, however, is when Candace and Vanessa manage to get their clothes mixed up at the dry-cleaners, resulting in a backwards day for everyone.

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.

Phineas and Ferb help a friend display his artwork.

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 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 mentors hideout, so that no one could discover his secrets, but not if Perry has something to say about it.

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.

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

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.

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

The guys create a sports competition that pits boys against girls to see which are the better athletes. Meanwhile, Candace is having a bad hair day, and Doofenshmirtz trys to win a dog show.

Candace tries to get footage from a traffic camera to prove that her brothers create unusual stuff. Meanwhile, Perry wants to destroy the video to preserve his secret identity.

Phineas and Ferb build the world's largest bowling ball and pins.

Phineas, Ferb, and Candace go to a Renaissance festival and Phineas and Ferb get Candace to go into a jousting tournament.

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

The boys go on an archaeological dig and find a real caveman, who falls in love with Candace. Meanwhile, Dr. Doofenshmirtz plans to destroy all people dressed as sandwiches.

Phineas and Ferb decide to spend the day doing absolutely nothing, but Candace doesn't believe them and ends up constructing something of her own. Meanwhile, Doofenshmirtz invents an ugly-inator so he will be more handsome than everyone else.

The boys build a roller-derby rink for their grandma, who once was on a championship derby team, so she can skate against her onetime rival. Meanwhile, Doofenshmirtz believes a statue of a bearded man is mocking him because he can't grow facial hair.

Candace uses a reality show to secretly film her brothers designing a white-water rafting ride.

The boys stage a chariot race through the town's streets after learning about ancient Greece. Meanwhile, Dr. Doofenshmritz creates a giant robot named Norm to destroy Perry.

The boys set out on a high-seas adventure after learning about a mysterious pirate from their grandpa. Meanwhile, Candace spies Perry and Dr. Doofenschmirtz up to their old tricks

Phineas and Ferb build super tree houses for themselves and Candace. Meanwhile, Dr. Doofenshmirtz plans to ruin a ceremony in his brother's honor.

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 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 build a shrinking submarine so they can go inside Isabella's dog and retrieve a sash the pet ate, but they accidentally end up in Candace's stomach instead.

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. Meanwhile, Doofenshmirtz creates a shrinking machine that will make whatever he hates implode.

When the boys build Candace a practice vehicle, she winds up in a monster-truck rally.

Candace and the boys visit Grandpa Clyde and Grandma at their lake house.

The boys design a wooden toy version of Perry, which becomes a hit.

Phineas and Ferb build an ice-cream maker that will create the biggest sundae ever.

Perry must rescue the boys when they set off on a secret spy mission.

After visiting a local Egyptian movie theater, the boys decide they want their own mummy.

The boys enlist the neighborhood children to take part in their traveling backyard circus.

The boys make it snow during the middle of Summer with the use of a snow-cone machine in their backyard. Meanwhile, Doofenshmirtz wants to drain all the chocolate in the tri-state area into his own candy factory by melting it with a device he's invented.

The boys begin a cattle drive when they become cowboys. Meanwhile, Doofenshmirtz has an idea of promoting his aluminum siding sales by letting loose termites to consume everything made of wood.

Candace is forced to wear outfits designed by Phineas and Ferb when she becomes a model. Doofenshmirtz creates a cloning machine and makes a duplicate of himself.

Phineas and Ferb decide to clone themselves to make the best of their summer vacation.

While visiting Mount Rushmore, the boys plan a surprise for Candace's birthday.

Boxer Evander Holyfield trains Phineas and Ferb for a fight with a bully.

When the director walks off the set, the boys take over the creation of a movie which features Candace, changing the theme from a British period piece to a monster flick. Meanwhile, Doofenschmirtz uses a new aging machine he has created to age some gourmet cheese.

The boys enter the family car in an auto race; Perry must stop Doofenshmirtz from deflating every inflatable in the world.

The boys write a hit song and perform it on "Super American Pop Teen Idol Star"; Dr. Doofenshmirtz builds a giant robot.

Phineas and Ferb decide to create their own personal paradise in order to get some well deserved rest and relaxation. Meanwhile, Dr. Doofenshmirtz attempts to steal all of the lawn gnomes in the tri-state area, though Perry isn’t about to let that happen.

While Mom goes shopping, Phineas and Ferb build "the coolest coaster ever" as Candace tries desperately to convince their mother of its existence. Meanwhile, Perry battles with Dr. Doofenshmirtz to stop his plan to cover the Tri-State Area in tin foil.