This is the list of Big Ideas in Season 1

Episode Image Big Idea Disappearance Notes
"Rollercoaster" Flying rollercoaster They build a backyard roller coaster. They also train monkeys to juggle (mentioned, happened before roller coaster) Doofenshmirtz's giant magnet and Magnetism Magnifier pick it up.
It ends up at Melissa Chase's backyard. ("Murphy's Lard")
The rollercoaster goes all over town.
"Lawn Gnome Beach Party of Terror" Backyard beach revealed They build a beach in their backyard and do surfing contests, limbo contests, sand castle building contests, etc. Doofenshmirtz's Destruct-inator sucks up all the water, then Phineas pushes a button to put up the fence, hiding the beach before Mom enters. It's unknown what happened to the rest of the beach afterwards. This is one of the most near-impossible plans, since the houses behind Phineas and Ferb disappear.
"Flop Starz" Flop Starz They become one-hit wonders and make a band called Phineas and the Ferb-Tones to make a hit song "Gitchee Gitchee Goo."

Building with ad: Gets demolished.

Band: They retire.

The boys don't know their mom used to be a one-hit wonder named Lindana.
"The Fast and the Phineas" 42 lands on the road They enter a race with a life-size remote control car (their mom's modified car). The car goes through a car wash, which removes all the modifications. (There were four other ways this invention could have disappeared.) The boys race in the Swamp Oil 500.
"Lights, Candace, Action!" Reassuring Candace about the rubber snakes They become movie directors and help Candace make a movie, with Candace as the main character. Doofenshmirtz's Age Accelerator-inator zaps the adolescent cinema audience and turns them into pensioners, who hate the movie. The boys have an incredible number of hits on their homemade-video website and are hired as the directors of a big budget movie starring Candace.
"Raging Bully"

Phineas punching a string of sausages
Boxing ring

Phineas thumb wrestles Buford after accidentally dropping ice cream on him. Doofenshmirtz's Slave-inator mind controls the crowd into cleaning everything up. The boys build an arena to thumb wrestle in the Googolplex Mall parking lot.
"Candace Loses Her Head" Candace and her monument They carve Candace's face into Mount Rushmore for a birthday present. A lava flow caused by Doofenshmirtz's Drill-inator, causes the face to fall apart. Their work is intended as a birthday present for Candace.
"I, Brobot" Circle of brobotsI brobot60Zoo close-upI brobot65I brobot66Robot Bean & Tea Leaf They build a second-generation robot-building device to create the Brobots, Phinedroids and Ferbots. Robot Machine: N/A

Brobots: Doofenshmirtz's giant magnet attaches to Santa's sleigh, who's doing a Summer run, and then proceeds to pick up the Brobots. One of the Ferbots was bagged by Candace, then taken away by a garbage truck. It is unknown what happened to the things they built.

Realizing there are too many plans for the two of them to carry out, the boys enlist the help of their newly created robots.
A total of six plans are shown completed during this episode, with two others designed but not (explicitly) built.
"Run Away Runway"
They build a cold-fusion reactor but then decide to become fashion designers instead and create their own style of clothes. Doofenshmirtz's clones set a new trend for lab coats, so everyone starts wearing them instead. The Summer All The Time Collection rocks the fashion world.
"The Magnificent Few" Horse riding They go on a cattle drive and around Danville. They round up the cattle and a fence, made by termites eating part of a rollercoaster, falls around them. Phineas and Ferb become cowboys and drive a herd of cattle through downtown Danville.
"S'Winter" Snowboard Champions They use a snow-cone machine to create a new season, S'Winter, summer and winter mixed together. Doofenshmirtz plugs in his Melt-inator, which causes a power surge, so the fans and freezers keeping it cold turn off and it melts. Isabella then invites everyone who was part of S'Winter to her house for hot cocoa. Some people call it Wummer.
"Jerk De Soleil"
Circus Tent
They set up their own circus. Doofenshmirtz's Voice-inator fills the tent with Doofelium until it bursts. They erect a big tent in their backyard after the local performance of was canceled.
"Are You My Mummy?" Hi, Mummy Are You My Mummy76 They try to find and catch a mummy and mistake Candace, who is wrapped head to toe in toilet paper stuck to her by butter and stale bubble gum stuck in her mouth so she can only mumble incoherently, for the mummy. A water flow shatters the sarcophagus and cleans all the toilet paper, butter, and gum off Candace. Phineas and Ferb were inspired after seeing a movie at an Egyptian-themed movie theater. The boys search the theater basement for a real mummy, but the mummy exhibit is just promotional junk.
"Ready for the Bettys" Inside Agent P's lair They "become secret agents" after discovering Agent P's lair and save Candace and the Bettys. Perry takes back his hovercar and dumps the boys into Isabella's pool. Don't actually build anything, but stumble on Perry's secret lair and accidentally take on his secret mission. Phineas thinks Ferb put the whole thing together.
"I Scream, You Scream" Well, this can't be rightIce cream in bed They build the world's biggest ice cream maker for Isabella after her tonsils were removed. They accidentally get the blueprints for and wind up building Doof's Space Laser-inator and launch it. Fortunately they didn't attach the laser when it took off. They try to create an ice cream machine but end up making Doofenshmirtz's Space-laser-inator instead. Ferb takes the laser plans by mistake because he is distracted by Vanessa. They were going to recreate the Trojan War.
"Toy to the World" Perry the Inaction Figure They remodel a toy factory to produce a toy so stupidly simple, so basically bland, so idiotically uncomplicated that it can do absolutely anything. The Har D Har Toy Company stops production of the toy when Phineas and Ferb resign. The toy is modeled on Perry the Platypus.
"Get That Bigfoot Outa My Face!" GetThatBigfoot They scare the group with a fake Bigfoot and telling other stories. Doofenshmirtz gets tied up in the wires for the Bigfoot dummies and he runs away with the fake Bigfoots in tow. Candace and their grandparents get the last laugh.
"It's a Mud, Mud, Mud, Mud World"
The Candace Crusher
They turn the family car into a monster truck called the Candace Crusher and make a derby. They also make their toy monster trucks go light speed. Buck Buckerson takes the track and the boys turn off the modifications to the family car. They help Candace learn to parallel park by entering her in a monster truck rally.
"Mom's Birthday" Happy Birthday, Mom! They throw the best birthday party ever for their Mom. N/A Highlights: A breakfast bar, a giant birthday card, a video presentation, and a satellite up-link to Dad, who's out of town.
"Journey to the Center of Candace" Sub They build a shrinking submarine and go inside Candace. The submarine is sucked up by a giant vacuum cleaner, and later swallowed by Pinky. They want to help Isabella get her sash back from her dog Pinky's stomach.
"It's About Time!" Needstobepluggedin They fix the museum's time machine and go to the time of the dinosaurs. The first time machine is stepped on by a T. Rex. The one that Isabella and the Fireside Girls built and used to rescue them does not vanish, but the T. Rex that followed them back to present day is zapped by the Freeze-inator, transforming it into a display in the museum. Other "ripples", such as Lawrence seeing an imprint of his daughter on a fossil, are undone when Phineas and Ferb ride their scooter over it, splattering the mud back in the Cretacious Period before he can show Linda. Isabella and the Fireside Girls come to the rescue after Phineas figures out how to send a message through time.
"Dude, We're Getting the Band Back Together" Love Händel reunion concert They reunite the band Love Händel after their dad forgets their anniversary. N/A They help recreate the most romantic moment in their parents' relationship for their anniversary.
"Tree to Get Ready"
Phineas and Ferb's Treehouse
They fix up their and Candace's old tree houses and have a tree house fight. After they trip over a cable, they roll all over town and all the modifications fall off. The tree house fight controls are based on the ones from a wrestling video game the Candace and Stacy play.
"The Ballad of Badbeard" Phineas and Ferb's ship They make a pirate ship out of Grandpa Clyde's dingy. N/A They use it to find Badbeard's treasure, bad fake beards.
"Greece Lightning" Leading the chariot race They have a Chariot race through Danville with Phineas, Ferb, Isabella and the Fireside Girls, Buford, Baljeet, and Candace (who wins). The chariots are destroyed when they crash into the museum. There are no rules for the chariot race from the Flynn-Fletcher house to the museum.
"Leave the Busting to Us!" PF ferris wheel
PF waterslide
They build a Ferris Wheel and a backyard water ride.

Ferris Wheel: A laser, presumably from Doofenshmirtz, hits it and it rolls away.

Candace is secretly filming them for the reality show Bust 'Em.
Water ride: A tornado from Doofenshmirtz's Gloom-inator 3000-inator sucks it up.
"Crack That Whip" View from above the new arena They build a roller-derby rink. Doofenshmirtz's Bread-inator hits it and then a flock of magpies eat it. Roller derby queen Grandma Betty Jo wants a rematch with an old rival: Jeremy's grandmother.
"The Best Lazy Day Ever" Boys relaxing They do nothing for a whole day to try it out. Candace, annoyed at this, decides to build something herself: a giant dinosaur-themed water slide. The dinosaur comes into contact with Doof's balloon and it flies the slide out of the yard. The boys initially intend to build a train, but decide to relax instead. Though Candace is supposed to have a good day of her own, she can't because she has been used to trying to bust them.
"Boyfriend From 27,000 B.C." Boys with Conk They find a caveman named Conk, and attempt to teach him about the modern world. Doofenshmirtz falls into a sandwich suit, which a hungry Conk chases away. Conk follows Candace in a cavegirl costume, who is bringing a sandwich platter to a costume party. She mistakes him for Jeremy in a costume.
"Voyage to the Bottom of Buford"
The Submarine is Lowered Into the Water
They build a submarine to help Buford find his goldfish Biff, who is lost at sea. The camera that Candace used to take photos was shorted out by the water from the water tower. It's unknown what happened to the submarine, though.

Phineas uses a submarine to find Biff in Danville harbor.

This is the second time Phineas and Ferb built a submarine.

"A Hard Day's Knight"
The Jousting Arena
In England, the boys hold a Medieval Tournament. A giant robot dragon, controlled by Doofenshmirtz, explodes and destroys everything. Candace starts out acting the part as the damsel in distress, but ends up in even more distress as the Black Knight.
"Traffic Cam Caper" Bike with rocket engine They build an escalator to the Moon (mentioned) and chase Norm to recover Candace's evidence.

Bike: The bike took off and exploded.

It takes place at night and Candace is trying to use the traffic camera footage to bust them. They help her out because they think it would be cool to fight a giant robot.

Disk: Perry took the disc because it recorded his secret identity and had to dispose it

"Bowl-R-Ama Drama" Boys napping They build a giant piloted bowling ball and make the world's biggest bowling game. It hits Doofenshmirtz's Giant Robot Penguin Icy Freeze Your Socks Off Breath -Inator Thingies and explodes. They use a giant bowling ball to break world records.
"Got Game?"
They begin a series of bizarre sports for their friends to compete in (Candace and Isabella vs. Baljeet and Buford) and create a stadium for the F-Games. Doofenshmirtz's falls into the pet shop, startling the woman holding it, who stumbles backwards and knocks over a cage with a cat in it. The cat runs into the road, causing a lorry to swerve and hit a giant globe, which rolls into a space rocket about to launch, knocking it over. It flies sideways and picks up the stadium. The boys go against the girls in a game of life-size Foosball, which takes place in the F-Games Stadium.
"Comet Kermillian"
They build the "Observa-Ferb-atory" with an enormous laser, with which they carve their faces into the passing-by Kermillian's Comet. Doofenshmirtz's heat ray makes the Obseva-Ferb-atory explode. They intend to show it to their grandchildren when it comes back after another seventy-three and a half years.
"Put That Putter Away"
Miniature Golf
They build a miniature golf course and test it out with Stacy. Doofenshmirtz's Atomic Leaf Blower-inator blows the windmill at the top, making it fly away. Candace is sick, so she relies on Stacy to bust the boys. Stacy gets distracted and ends up playing with the boys.
"Does This Duckbill Make Me Look Fat?" The teleporters They build a real teleporter after seeing one in a movie. Doofenshmirtz's old Shrink-inator hits the teleport rings, turning them small enough to be replacement earrings for the ones their mother cannot find. When Candace and Perry accidentally enter it at the same time, their minds switch.
"The Flying Fishmonger" Fishmonger post-flight They help their Grandpa Reginald jump a gorge with his motorcycle, the Holy Mackerel. A giant shoe from Doofenshmirtz's Who's Crying Now-inator hits some dump trucks, which fill up the gorge. Grandpa Reginald requests to hear his old theme song once more, causing it to rain, making grass grow. The Mackerel was previously converted into a lamp!
"One Good Scare Ought to Do It!"
Mariachi Tree

The Haunted House
They build a haunted house to scare the hiccups out of Isabella. The haunted house is picked up by a string of Christmas lights and then destroyed by Doofenshmirtz's Disintivaporator. Before they find out about Isabella's hiccups, Phineas and Ferb create a Mariachi tree.
"The Monster of Phineas-n-Ferbenstein" Platypus monster walking through town Phineas and Ferb's ancestors enter a monster contest by creating a giant platypus monster. The angry mob doesn't notice the monster platypus and starts chasing after Constance, who had drank Jekyll Doofenshmirtz's potion, changing her into a monster. It was raining at the time, so Phineas and Ferb could not follow through with their plan to "stand alone in a field with a metal rod". Instead, their grandfather tells them this story to pass the time.
"Oil on Candace" Helicopter paint roller They paint the "Unpainted Desert" with Django to make a picture Django made on a piece of paper. Doofenshmirtz accidentally destroys the Danville dam, so the water rushes over the Unpainted Desert, washing the paint off. They do this for Django so he can make his father proud. In the end, the painting is washed out, but Django's father is still happy with the small painting Django did for him.
"Out of Toon" Team Improbable They make a cartoon about themselves and their friends as superheroes, using the Phineas & Ferb Studios. Doofenshmirtz's Dance-inator hits the studio and screen, so it gets up and dances away. They are inspired by Pinhead Pierre, who asks, "If you could have any super power, what would it be?"
"Hail Doofania!" Rainbowinator firing They create a Rainbow-inator after Isabella points out she had never seen one. (She was really meaning she had never seen a unicorn) Perry the Platypus, who is wearing a scratch collar, tries to run into his lair, but rebounds off the wall and hits the self-destruct button. The plan came about because Phineas thought Isabella had never seen a rainbow in real life. When she pointed out that what she wanted to see was a unicorn, Phineas tells Ferb that he knows what they'll do tomorrow.

When Perry bumps into the self-destruct, Ferb comments that he did not remember putting a self-destruct button on the thing to begin with.

Oddly enough, Phineas and Ferb build an "inator", while Doofensmirtz tries to start his own country. Usually, it is the other way around.

"Out to Launch" The boys' rocket They build a rocket to visit the stars their dad bought them on the Internet. They also build a second rocket for Candace.

The first rocket: It explodes.

The second rocket: Linda reverses the car into the garage. The car is still connected to the rocket, however, so it launches back into space.

Building a rocket is featured in the Phineas and Ferb Theme.

"Phineas and Ferb Get Busted!"
They build "The Flying Car of the Future -- Today!" They are also sent to Smile Away Reform School. While at the "school", they build a bed that is like a Ferris Wheel and have a corn dog stand toward the end. In reality, the boys never have a plan at all. The car gets destroyed on the way there, then falls into a canyon and breaks. The entire episode is a dream.
"Unfair Science Fair" Portal to Mars They help Baljeet get a good grade by building a Portal to Mars. Mr. McGillycuddy plugs it into a high voltage outlet and turns it all the way up to high, so it implodes. Baljeet didn't win the fair. However, he wasn't dismayed by that because he was only in it for the grade.
"Unfair Science Fair Redux (Another Story)" Ferb talking to the Martians They try to rescue Candace, who is trapped on Mars. They retrieve their sister and the Martians' carving of Candace's face on Mars is blown up by Doofenshmirtz's first inator. They fix and upgrade the mars rover that Candace destroyed by turning it into a car.
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