While their mother is out shopping, the boys build a roller coaster. Dr. Doofenshmirtz and Perry battle due to the doctor's evil plan of throwing the earth off its rotation.

Phineas and Ferb's newest backyard project is to create a tropical beach paradise. Meanwhile, Perry tries to stop Dr. Doofenshmirtz's plan to steal all the garden lawn gnomes.

Phineas and Ferb decide to become a one hit wonder, Phineas and the Ferb-Tones and Candace wins the chance to sing with them. Meanwhile, Perry must stop Doofinshmirtz's giant robot - disguised as a temp.

Phineas and Ferb enter the family car in an auto race, while Candace has to bust them and impress Jeremy. Meanwhile, Perry must stop Dr. Doofenshmirtz from deflating every inflatable object in the tri-state area.

Upon hearing that her favorite play is being made a movie, Candace rushes to try for the lead, only to see that Phineas and Ferb have become the directors and changed the script to include a little more insanity. Meanwhile, Perry goes to Doofinshmirtz Evil Inc. to find out why Heinz has been so quiet lately.

Phineas enters a thumb-wrestling competition with a local bully, while Doofenshmirtz creates a hypnotic device to control people's minds so they will sing him Happy Birthday.

Phineas and Ferb decide to carve Candace's face into Mount Rushmore for her birthday present, while Perry attempts to stop Doofenshmirtz from making a tunnel to China.

Phineas and Ferb clone themselves so they can complete more projects while Doofenschmirtz hovers over his girlfriend's house with a huge magnet to erase crazy messages on her answering machine, for the sake of recording new ones.

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.

The boys create a circus for the neighborhood after their original circus plans are canceled, while Jeremy gives Candace wild parsnips which she is allergic to. Doofenshmirtz creates a device to make people's voices higher so his own voice will seem lower.

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.

Based on the fact that a platypus doesn't do very much, Phineas and Ferb create a wooden toy version of Perry to sell to a toy company. Meanwhile, the real Perry heads off to stop Doofenshmirtz from building the Great Wall of the Tri-State Area and starting up toll booths at the only exits.

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 and Ferb create a monster truck for Candace to practice driving while Dr. Doofenshmirtz tries to find investors for his line of monster trucks that are actual monsters, with a trump card to take down the competition.

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.

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, but is it all in her head?

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, once and for all.

Candace uses a reality show to secretly film her brothers designing a white-water rafting ride. Meanwhile, Perry must crush Doofenshmirtz' dream of becoming a magician, as well as dominating the tri-state area.

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

Phineas and Ferb decide to do absolutely nothing for the day. Candace questions her purpose in life after realizing that she can't bust her brothers for doing nothing. Meanwhile, Dr. Doofenshmirtz is tired of being the ugliest person around, so he invents a device that can turn anything and anyone ugly.

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.