The boys create a circus for the neighborhood after their original circus plans are canceled, while Jeremy gives Candace wild parsnips without knowing that she is allergic to them. Doofenshmirtz creates a device to make people's voices higher so his own voice will seem lower but instead, it gets even higher.

The boys 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. Doofenshmirtz tries to raise the city's water level by destroying a beaver dam so his real estate will become beachfront property.

After Candace sarcastically suggests that they can make a better toy than the Har D Har Toy Company's "Shimmy Jimmy", Phineas and Ferb design an "inaction figure" based on their pet platypus. Meanwhile, Doofenshmirtz plots to build toll booths to enter and exit the Tri-State Area so he can become rich.

The boys invent a monster truck for Candace to practice driving, but soon her practice run turns into a massive racing rally. Doofenshmirtz tries to discover investors for his line of monster trucks that are actual monsters. Note: This episode is available on The Daze Of Summer DVD along with The Ballad Of Badbeard episode.

The boys locate their parents' favorite band, Love Händel, to perform a reunion concert in the backyard to make up for their Dad wedding anniversary. Meanwhile, Doofenshmirtz plans a surprise birthday party for, Vanessa, also planning to launch Perry the Platypus on a giant firecracker as the grand finale.

The boys set out on a high-seas adventure after learning from their grandpa about a mysterious pirate, Badbeard. Candace spies Perry and Dr. Doofenshmirtz up to their old tricks after getting infected by a psychedelic moss.

The boys stage a chariot race through Danville's streets after learning about ancient Greece. Perry finds his latest enemy to be, not Doofenshmirtz, but instead one of his creations: a giant, robotic, mild-mannered businessman named Norm.

Candace uses a reality show, Bust Em!, to secretly film her brothers designing a white-water rafting ride. Doofenshmirtz tries to create a new ice age via weather pellets.

Phineas, Ferb and Candace visit their grandparents in England and the boys create a Renaissance fair, where Candace ends up in a jousting tournament. Meanwhile, Perry goes undercover at an evil scientists' convention to track down Dr. Doofenshmirtz.

Candace acquires footage from a traffic camera showing proof of her brothers' antics. But Perry, using Dr. Doofenshmirtz's robot Norm, steals it for himself so it can be destroyed since it contains evidence he is a secret agent.

The boys build the world's largest bowling ball and pins to try to beat the world record and get into "The World's Most Pointless Records." Candace test-drives the bowling ball, which she plans to show to Jeremy, when she accidentally disables an internal gyroscope, she loses control and rolls around through downtown Danville. Meanwhile, Doofenshmirtz tries to use giant robotic penguins to freeze Danville so he can sell addictive hot chocolate for a million dollars a cup.

Phineas and Ferb build an observatory and plan to etch their faces in a comet; Candace is physically tormented by Jeremy's 'criminally-insane' sister Suzy while on an outing with him. Doofenshmirtz buys all the steaks in the city so he can mass-market glasses made from them, and also creates a giant heat ray.

After watching an old sci-fi film, Phineas and Ferb decide to build a molecular transporter, which ended up switching the minds of Perry and Candace into each other's body after they accidentally go in together. However, Candace is forced to spend most of the day as a platypus while Perry (in Candace's body) goes on a mission to foil Doofenshmirtz's newest scheme; to replace the Mr. Slushy Burger jingle in the statues of mascot "Slushy the Clown" with his own evil jingles.

Isabella has the hiccups and Phineas and Ferb build a haunted house to scare them away. Candace goes over to Jeremy's house, but is interrupted by his little sister Suzy. Dr. Doofenshmirtz tries to help his mentor by destroying his lab.

Baljeet felt bad when he got an A minus. When Baljeet enters the science fair with a design for a portal to Mars, Phineas and Ferb help him build it to scale so he can get his all-important grade. Meanwhile, Dr. Doofenshmirtz tries to win first prize at the fair with a giant baking soda volcano, and Candace competes with a girl for a job at Mr. Slushy Dawg.

Phineas and Ferb try to rescue Candace from Mars, who thinks that nobody, not even her friends, want to talk to her. Meanwhile, Perry helps Dr. Doofenshmirtz shop for supplies for his baking soda volcano that he believes will make him win the science fair.