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The two stepbrothers are determined to make their summer the best it can be. To do so, they built outrageous and somewhat impossible inventions and other such items. Their sister, Candace, is obsessed with "busting" them, immediately calling their mom to inform her of the boys activities. Another key element of the show is the boys pet platypus named Perry, who is a secret agent for the O.W.C.A ("Organization Without a Cool Acronym"). The series relies heavily on running gags. In each episode, Phineas exclaims "I know what we're gonna do today," character Isabella introduces herself with "Whatcha doin'?" and almost always Ferb will speak, even though he normally does not. Dr. Dooofenshmirtz, as well, will always trap Perry the Platypus in some way.
Irving’s brother Albert doesn’t believe that Phineas and Ferb are anything special, and since he claims to be the “Truth Detector,” he can prove it. Desperate to prove Albert wrong, Irving convinces Baljeet and Buford to pose as Phineas and Ferb beside a giant hologram of the boys’ Eiffel Tower construction. Meanwhile, Dr. Doofenshmirtz is fed up with the quality of accessories for his model train set, and decides to shrink down a variety of national monuments to add to his collection.
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Candace, Stacy, and Jenny team up to try and bust Phineas and Ferb together. Meanwhile, Dr. Doofenshmirtz enlists a new robot to replace Norm, but a power surge causes it to glitch and turn against him.
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The boys trick out the kiddie rides at a store, Dr. Doofenshmirtz tries to burn his name into the atmosphere.
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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.
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Phineas and Ferb decide to help build floats for all the neighborhood kids in the yearly "Tri-State Area Unification Day" parade, but a family grudge leads Buford and his family to try and wreak havoc on the parade.
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When the boys build an Anti-Gravity Fun Launcher, Carl accidentally intercepts their plans and assumes they are working for Dr. Doofenshmirtz, so he is sent undercover to figure out what they are doing. Meanwhile, Perry tries to find a lost agent, and Dr. Doofenshmirtz also acquires the blueprints to help with a parking issue on his street.
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Candace and Suzy try to get Phineas and Ferb to bust themselves, the boys build a replica of Niagara Falls so they can ride a barrel over it, Doofenshmirtz builds a device to increase his carbon footprint, but his idea of doing it involves using a large foot made of carbon paper.
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Lawrence's memory is accidentally erased by a gadget in Perry's lair before participating in a father-daughter race with Candace, so Perry operates a robot version of Lawrence to fill in for him. Meanwhile, Dr. Doofenshmirtz invents an opposite of glue named "Eulg," which breaks stuff apart rather than join it together.
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In this healthy lifestyles episode, Agent P must stop Dr. Doofenshmirtz from spraying a partially hydrogenated coconut oil and corn syrup concoction over the entire Tri-state area to turn lean meats, whole grains, fruits and vegetables into junk food...
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Phineas and Ferb create an orb that allows them to pass through solid objects and to ultimately, help them retrieve Mom’s favorite guitar pick for her gig at the Mayor’s Day Festival. Candace sees their orb as the perfect way to bust them and brings it to Mom, but en route to the festival, the troublesome Wilkens Brothers put a kink in her plans. Meanwhile, Dr. Doofenshmirtz attempts to destroy a statue erected in his brother Roger’s honor.
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