Big Ideas

"Hey, Ferb! I know what we're gonna do today!" — Phineas.

Almost every day during their summer vacation, Phineas Flynn and Ferb Fletcher have Big Ideas and go through with them. Some of the plans are used as a way of helping someone in need, while others are just to help them have the best possible summer ever, as described in "Rollercoaster" and "Rollercoaster: The Musical!".

List of Big Ideas

Main article: Big Ideas/Season 1

Main article: Big Ideas/Season 2

Main article: Big Ideas/Season 3

Main article: Big Ideas/Season 4

Specials and Misc.

Episode	Invention	Description
Camp Rock 2: The Final Jam	"It's On" (Summer version)	Crossing over with the cast of Camp Rock 2: Final Jam, Phineas and Ferb directed the Summer version of the music video "It's On" from Camp Rock 2: The Final Jam, kicking off Disney Channel's Summer Vacation. The video ends with the entire party leaving the boardwalk.
Phineas and Ferb the Movie: Across the 2nd Dimension	Platypult	The boys made a platypult to play badminton with Perry. They then get off-course and crash into Dr. Doofenshmirtz's Otherdimensionator, leading into a grand adventure as they through a parallel universe with Agent P in agent form and try to defeat Alternate Doofenshmirtz.
	Robot Riot	As Doofenshmirtz of the 2nd Dimension invades Danville of the 1st Dimension with his army of Norm Bots, Phineas and Ferb enter Perry's lair, to discover Perry has preserved many of their previous inventions with computer data, which is able to be replicated with special O.W.C.A. technology. The boys use their previous inventions alongside many of the kids of Danville to fight off the Norm Bots and save the Tri-State Area.
"The Phineas and Ferb Effect"	Murphy's Law Suit	After studying and collecting data on Murphy's Law, as well as learning about the Phineas and Ferb Effect, the brothers build a giant mech suit in Milo's likeness in order to defeat the Pistachions. The Murphy's Law Suit is able to aim Murphy's Law in any direction. In order for it to work, Milo, Phineas, and Ferb should be together in this machine.

Background Information

• The plans the boys come up with can be described as impossible because they are accomplished in a very short amount of time (less than a morning {they use the invention in the afternoon, most likely}) and involve technology that has yet to exist in the real world: teleportation, mind-switching, time traveling... Phineas and Ferb do not think of their plans as impossible, just fun and great. When Isabella asks Phineas if building a time machine is "kind of impossible", he replies, "That's a possibility". ("It's About Time!")
• The phrase "Big Ideas" references the advertising campaign that Disney Channel ran prior to the launch of the series in February 2008. For Phineas, it was "he thinks big". For Ferb, it was "he thinks how".
• Despite Phineas saying that he likes to "keep moving forward", he actually has repeated his big ideas. Examples are the rollercoaster in "Rollercoaster", "Fireside Girl Jamboree", "Phineas and Ferb-Busters!", and "Rollercoaster: The Musical!"; the waterslide in "Leave the Busting to Us!" and "Elementary My Dear Stacy"; the molecular seperator in "Split Personality" and "Canderemy"; and the time machine in "It's About Time!" and "Phineas and Ferb's Quantum Boogaloo."
• Phineas and Ferb have been busted five times on-screen.
  • It was all Candace's dream in Perry's dream ("Phineas and Ferb Get Busted!").
  • Older Candace busted them while building the Rollercoaster, which has been undone by herself after she saw that this would lead to a dystopian society run by Emperor Doofenshmirtz. This happened in another universe. Later, Candace busted them by showing herself to future mom, but this has probably been undone by Isabella when she went back in time and made the entire episode undone during the credits. Along with the fifth time they were busted, this happened in another universe ("Phineas and Ferb's Quantum Boogaloo").
  • When they built a pioneer village, but that was undone when the acceleratorinator moves time backwards ("She's the Mayor").
  • Once Candace succeeds in busting them briefly, however her mother is hit with Doofenshmirtz's "Forget-About-It-Inator" repeatedly and by the time she is no longer being hit by the ray, Candace has ran off and the boy's invention isn't in view so she returns inside ("A Real Boy").
  • Linda "busts" Phineas and Ferb herself due to them leaving towels all over the ground. ("Love at First Byte")
• However, there are other times where Phineas and Ferb's plots have been seen by their parents, a famous example being in "Dude, We're Getting the Band Back Together" among others, however they weren't "busted" for them (assuming "busting" implies that they were intentioned to get in trouble for whatever they're doing). Their dad has also seen and has been involved in some of their big ideas, but it doesn't seem he minds and Candace almost never gets her dad to bust them which implies the busting power is from their mom.
  • One famous example is during Mom's birthday, because on that day she saw everything they built ("Mom's Birthday")
  • Mom saw the teleporters but due to the effects of Doofenshmirtz's Shrinkinator, she thinks they're earrings the boys made her ("Does This Duckbill Make Me Look Fat?").
  • Their Mom actually sees Nosebud and says that it's "pretty cool" because it actually floats, but does not know about the station under it ("The Lake Nose Monster").
  • Mom saw the animal translator, only to her Phineas and Ferb were just using some sort of recording machine because it didn't work on Perry ("Interview With a Platypus").
  • Mom saw only the top portion of the fort (and not the other giant parts of it). Upon seeing this, she remarks on how Phineas and Ferb are "beginning to take an interest in building things" ("Thaddeus and Thor").
  • Mom saw Phineas and Ferb's creation, only Phineas and Ferb were gone and she thought it was some kind of modern art ("The Bully Code").
  • Mom saw Phineas and Ferb's Backyard Hodge Podge made out of recycled parts, but thought she was hallucinating, and Candace cannot see it clearly after being hit by Doofenshmirtz's Eye Fog-inator ("Backyard Hodge Podge").
  • Mom saw the jumbotron to Phineas and Ferb's Ultimate Obstacle Course, but because of the picture of the boys on the monitor, she assumes it's just the boys and leaves ("One Good Turn").
• Also, there are other times where the plots were seen by Phineas and Ferb's parents, a good example being in "The Best Lazy Day Ever", however Candace built a dinosaur slide in that episode.
  • They built something in "Perry Lays an Egg", but Candace was the one who got in trouble.
  • Phineas and Ferb built a Latest Technology All-Terrain Vehicle in The Secret of Success, but it was Candace who got into trouble as she said that she drove it herself and Mom grounds her that she was driving a car without any adult surveillance.
  • Phineas and Ferb didn't do anything in "Candace Gets Busted". But when Mom and Dad see that Candace is having the party (the Intimate Get Together), Candace is the person busted.
• Lawrence Fletcher has seen many of Phineas and Ferb's creations, but hasn't busted them.
• The only times the boys don't come up with a big idea were in "The Best Lazy Day Ever", "Vanessassary Roughness", and "Candace Gets Busted".