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This is the list of Big Ideas in Season 4.

Episode Image Big Idea Disappearance Notes
"For Your Ice Only" Hockey fieldFYIO Everyone say Canadian BaconHockey z9 The boys create Hockey Z-9. An ice resurfacer hit by Doofenshmirtz's Abominable-inator clears the Z-9 course away.

This is similar to Football X-7 from "My Fair Goalie".

They saved the name "Y-8" for croquet.

"Happy New Year!" The New Years Ball The boys plan their own New Year's Eve ball drop, complete with a customized multi-dimensional ball. Ferb launches the ball into outer space, and it explodes into fireworks. This is inspired by Vivian, who hypes up the tradition of staying up to watch ball drop.
"Fly On the Wall" A Tire Swing
Sundae Machine
They create a giant rocket-powered tire swing. Buford presses a red button that reads "FLY", and it goes up into the sky. Buford removes a piece of the console, causing it to emit a beam that can turn a human into a fly. When the tire swing disappears, Phineas moves a certain lever to turn the panel into a Sorbet Machine.
"Bully Bust" Dental Hygeineosphere They build the Dental Hygienosphere, a tooth-themed amusement park ride. Buford is hit by Doofenshmirtz's Luffa-Plex-Dill-Pickle-inator and sent into orbit; his shoelaces get caught on a stray decoration, taking the ride with him. The ray pulls Buford up with the ride.
"My Sweet Ride" MSR-138-Phineas playing a trumpet The boys restore and trick out Lawrence's old car for Candace. The car doesn't disappear; in fact, Linda and Lawrence see it but they think that the latter is responsible for it. The car wins Best in Show at the Doo Wop Hop.
"Der Kinderlumper" Rutabaga vehicles The boys create rutabaga-themed vehicles for the Running of the Chinchillas. The vehicles were trampled by the oversized chinchillas. All the kids were also trampled, but unhurt.
"Sidetracked" Phineas asking where Perry is in the episode Sidetracked The boys build a metal superstructure. Not seen, but the superstructure is carried away by what seems to be a magnetized cloud. The invention is not seen in the episode.
"Primal Perry" Infinite probability generator Baljeet has problems with making decisions, so the boys devise a possibility machine to help him. Liam's giant Boomerang destroys the machine thus reverting Baljeet back to only himself. When Baljeet had to make a choice he would be copied into two Baljeets and then three Baljeets and so on.
"Mind Share" Mind Share title cardMindSharePromoTwo The boys build a mind share device. Satellite: N/A

Mind Share Machine: Morg and his friends made it self-destruct.

After seeing a commercial of Morg in taking a vacation into another planet.
"Backyard Hodge Podge" Hodge Podge invention revealed They make an invention out of recycled parts. It doesn't disappear, but Candace can't see it clearly when zapped by Doofenshmirtz's Eye-Fog-inator while Linda thinks she's hallucinating. The invention uses parts from past ones.
"Bee Day" Giant wading pool Phineas and Ferb create a giant wading pool for their Mom. Pheromones latch onto the pool, attracting a swarm of bees, which lifts the structure into the air, where it pops. They are inspired to build it after learning of Linda's playtimes with Candace. Their old pool ends up being the only unaffected part.
"Bee Story" Bee Story-Isabella and the sorbet machine Isabella borrows the sorbet machine that can turn her and the Fireside Girls into bees. It does not disappear, but after a few hours, the effects wear off and they become themselves again. The Fireside Girls need it to earn their Beekeeping Patch. The machine is also seen in "Bee Day".
"Great Balls Of Water" The gang having fun They make an enormous water droplet. The liquid ball hits a prickly structure, causing all the water to be released into an empty hole. It is inspired by Baljeet, who had refreshed his knowledge on surface tension in physics camp.
"Where's Pinky?" I can smell the future They amplify Buford's senses to those of a dog using a sensorial helmet. Buford runs into the City Hall, where he eventually takes it off. Don, a City Hall tour guide, is later seen running out of the edifice with the helmet on. The invention is inspired by Isabella, who finds her dog missing.
"Knot My Problem" Gordian Knot They make a giant replica of the Gordian Knot out of licorice. Candace is zapped by the stray gun of Doofenshmirtz's All-You-Can-Eat-Buffet-Inator, causing her to eat the entire project. N/A
"Just Desserts" The kids started climbing They create a huge climbing wall out of lawn clippings. A swarm of bent-bill knot-hatches pick the wall for nest material, demolishing it.
"La Candace-Cabra" We present to you, the cupra-copter They set off to search for a rare Chupacabra by using their Chupa-Copter. The Chupacabra is actually an animal agent, Agent CH, so Perry uses the Switch Place-inator, making it switch places with Buford, and it flies away on the Chupa-Copter. Inspired by Buford's grandfather hunting the Chupacabra.
"Happy Birthday, Isabella" Birthday for Isabella revealed They throw a birthday party for Isabella. It doesn't disappear, but the grand finale is turned into butterflies. The grand finale is not seen, but part of it is mentioned as being a laser light show with swans.

All Isabella wants for her birthday is alone time with Phineas.

"Love at First Byte" NŚLAWSEMR The boys create a laser light show for the grand finale of the block party. Norm's head clings to the P.H.L.A.S.E.R. and flies off to space before it is scheduled to do so. They had been instructed by Linda to hire a company to handle it.
"One Good Turn" Obstacle Course Isabella, Ginger, Buford, Baljeet, Candace and Stacy compete in an obstacle course event hosted by Phineas and Ferb. It doesn't disappear, but a camera is zapped by the 90-Degree-Turn-inator, causing it to smash the jumbotron pole into blocking Linda's view of the entire project. To do the project, Phineas and Ferb use the leftover building materials of the Backyard Hodge Podge.
"Phineas and Ferb: Mission Marvel" Surfing Asteroids
Satelita
Candace and isabella headed up to the space station
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Mqdefault (54)
The heroes getting their powers back
In the beginning of the special, Phineas and the gang use the satellite from their space-station to power up their rocket-powered surfboards to surf the asteroid belts. Later, they build a Secret Hideout for Emergency Defense (or S.H.E.D. for short) full of machines to help the Marvel superheroes get their powers back. It is never explained what happened to S.H.E.D., but Candace accidentally makes the space station crash down to Earth, and Doofenshmirtz disintegrates it with his Disintegrator-inator. N/A
"Thanks But No Thanks" Mqdefaultpiramid The boys create a series of pyramid-related sports. N/A
"Troy Story" Isabella and Phineas in a chariot
Trojan War
Screen Shot 2013-08-25 at 1.22.47 PM
Phineas and Ferb recreate the Trojan War. The flying chariots get tangled up with the Trojan Dinosaur, and they fall onto the castle, crashing everything. Later, Lawrence gets zapped by Doofenshmirtz's De-Clutter-Inator, causing him to clean up the wreckage. This was originally supposed to be the big idea in "I Scream, You Scream", but was cancelled due to Isabella having her tonsils removed.
"Druselsteinoween" Haloween party in Drusselsteinian castle
DjFerb
The boys host a giant Halloween party. N/A Ferb mashes up and remixes past songs.
"Terrifying Tri-State Trilogy of Terror" Armed with bubble washers Buford accidentally makes evil platypus clones by pouring grape juice on Perry, so he and his friends use soap shooters to take them out. The entire adventure is a story.
"Face Your Fear" Foamtown The boys create a foam circuit as a safe place to skateboard without having to worry about bruising. The bat Derek flies through Foam Town multiple times, colliding Doofenshmirtz with it several times, eventually loosening the giant bolt enough for the structure to roll away to the desert. Buford is the one who motivates the kids to build it, because he can't afford to go to the hospital for any possible injuries.
"Cheers for Fears" Scrapbook-aganza page 5 They make a large scrapbook album containing Candace and Jeremy's moments as a present for Jeremy's birthday. Candace gets hit by Doofenshmirtz's Worst-Fear-inator, causing her to state her worst fear of the Scrapbook-aganza flying away before Jeremy arrives. It does exactly that. Candace had been having trouble figuring out what to get for Jeremy, so she asks Phineas and Ferb to help her.
"Just Our Luck" The stating point for sky tennis Phineas and Ferb play tennis in zip-lines. After the effects of the Stinklekrampen-Inator wear off due to Perry destroying it, the contraption sinks into a crack in the Earth after Candace proclaims the improbability of that happening. The idea of Sky Tennis is similar to that of Jetpack Volleyball ("Sleepwalk Surprise").
"Return Policy" Extreme batting cage
RP-94-Aqua Maximus
Phineas and Ferb hold an extreme batting contest. After Buford hits all the levels in the cage and the ball goes into the target, jetpacks come out of it and carry the batting cages into the sky, where it then explodes into fireworks. Phineas is inspired to create the challenge while listening to Baljeet and Buford's argument regarding the principles of hitting a baseball. It is revealed that they had built a giant water slide at Aqua Maximus.
"Live and Let Drive" Lald034 WHAT ARE THOSE BOYS DOING
Lald035 seriously, they're enlarging DNA
Lald039 who's giant foot is that
The activity is reduced to background scenes. It somehow involves getting DNA out of a pool, and a giant human foot. N/A N/A
"Phineas and Ferb Save Summer" We're joining you to celebrate around the world Phineas and Ferb make a tribute-to-summer concert and also save it using a giant rocket engine. N/A Doofenshmirtz inadvertently helps the gang to save the summer.
"Father's Day" S04E21 Samolot Phineas and Ferb build a biplane for their father. Reg flies it away before Linda and Candace return. N/A
"Imperfect Storm" Phineas' Wind Amplification Device Phineas and Ferb construct a wind amplificator to fly enormous kites. A storm hits and the kites are destroyed. Doofenshmirtz's water spills into the machine and creates the storm.
"The Return of the Rogue Rabbit" TROTRR5 They help the Fireside Girls with their puppet show by creating a giant marionette puppet. Agent P uses it to fight Dennis the Rabbit, eventually destroying it. N/A
"It's No Picnic" Picnic Power! The boys construct a picnic-themed amusement park in Danville Park. The entire environment and the people there-except Isabella and Phineas-are sent home by the Teleport-inator. Isabella had been trying to spend time alone with Phineas, but fails after Ferb is hit by a ray from the Teleport-inator, sending him back to the backyard.
"The Klimpaloon Ultimatum" Klimpaloon, Phineas and the gang They try to help Love Händel to find Klimpaloon. N/A N/A
"Operation Crumb Cake" Art Piece The boys construct a large art piece out of various things in their kitchen drawers. Phineas comes into contact with a beam from the Un-Retrograde-inator, causing him to undo the creation. The inator somehow causes Phineas to lose his memory of him receiving Isabella's letter.
"Mandace" Blueberry Air Phineas and Ferb create an aroma machine to change the smell of the air. As a side gig, they attempt to make a device to undo Candace's projection. N/A The second contraption remains unfinished.
"Phineas and Ferb: Star Wars" Phineas holding the Death Star disk

In a galaxy far far away from Summer, the counterparts of Phineas and Ferb try to return the blueprints of the death star to the rebels.

During a montage, they also fix evaporators, train rats, and do several other things.

They return the plans. N/A
"Lost in Danville" Z-Ray Machine
Mysterious Capsule
A mysterious capsule falls into their yard and they use Ferb's Z-ray machine to investigate it. A ray from the Unexist-inator hits the black hole, which has already sucked in the capsule and its residents. This adventure is set in another reality; at the end of the episode, the original Phineas and Ferb are watching the whole strange scene through a portal from the sorbet machine.
"The Inator Method" Solar System Model Racing Tower The boys build a model solar system racing tower. A man buys it after being hit by the Motivator-inator. The competition is called the Galaxy 5000; however, it is technically a 50-lap race. Phineas decides to name it as such so it sounds cooler.
"Night of the Living Pharmacists" The gang by the Rubberization Ray Phineas and Ferb build a Rubberization Ray and use it to give their skin rubber-like qualities.

Later, they make a pulley and a giant sprinkler to stop the Doof zombies.

The Doof Zombies destroy the Rubberization Ray. The rubberization skin prevents them from getting transformed; Only few people survives from the pharmacist zombie outbreak.
"Tales from the Resistance: Back to the 2nd Dimension" Discovering Sports The alternate version of the boys play sports, and venture to rescue Perry-2. N/A This happens in the 2nd Dimension.
"Doof 101" JohnPTristateRecess Phineas and Ferb make modifications in their school yard. N/A This takes place when the school starts.
"Act Your Age" Fireside Girls, Ferb and Baljeet admire their romantic dinner
Toddler Phineas and Isabella in backyard
Preschooler Phineas and Isabella in backyard
Kid Phineas and Isabella in backyard
Tween Phineas and Isabella in backyard
Phineas notice that Isabella is gone
The teen Fireside Girls, along with Ferb, Buford, and Baljeet, set up a romantic dinner for Phineas and Isabella. In a flashback montage, Phineas is seen building a giant robot as a toddler, a popcorn machine as a younger kid, a generic machine at the main series age, an oversized can opener as a teenager, and a giant robotic eggplant as an adult. The date is taken away by a moving dumpster steered by Doofenshmirtz's reckless driving. Phineas does not participate in the gang's Big Idea.
"Last Day of Summer" First incarnation of the last big idea
GottaGet
Phineas and Ferb try to seize the last day of summer by doing everything. They later use a catapult to get back in time. The ultimate ride disappears in several ways during the time loops, a consequence of which being Phineas and Ferb's erasure from existence. These are the last Big Ideas of the series' original run.
"O.W.C.A. Files" None None Phineas and Ferb only appear in the credits.

See also[]

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