Phineas and Ferb build a tree house and remodel Candace's old one. Later, they get in a Tree House Fight against Candace and Stacy. Meanwhile, Perry tries to stop Dr. Doofenshmirtz from getting revenge on his brother Roger.
Linda walks into the family room and asks what Candace and Stacy are doing. Candace replies that they are playing wrestling, their favorite video game. Mom tells Candace that she's going out to run a few errands-Grocery store, florist, and then car wash. Candace tells her mother that she's busy right now, trying to concentrate on her game. Linda tells her to call if there's any trouble, to which Candace replies, "With my brothers, you might as well call now."
Phineas and Ferb are in the backyard working on their tree house, having a conversation about an unnamed item making a sound. While doing so, Phineas realizes Perry is missing. Perry is in his Headquarters, and Francis "Major" Monogram alerts Agent P that all the pigeons went missing in the Tri-State Area. He then says that the only upside was that he hasn't washed his car for weeks. He quickly gets back on topic and believes that Heinz Doofenshmirtz might be behind this case.
Phineas and Ferb have finished remodeling their old tree house. Once they're done admiring it, Isabella comes and asked them what they're doing. Phineas says that they remodeled their old tree house. Isabella is exclaiming how cool it is when Phineas takes her over to a tire as they shoot up to the entrance of the boys' tree house. He takes her through the 'main crib' which Isabella comments, "Sweet." Phineas then tells Isabella to check out the view, where they come across Candace's old tree house that she doesn't use anymore. Isabella says it's sad, to which Phineas throws out the suggestion to remodeling it, with Isabella adding it should be something more Candace. The trio quickly gets to work.
Meanwhile, Perry arrives at Doofenshmirtz Evil Incorporated, parallel parks in an empty space and starts to climb over the top. Once he enters, he sees Vanessa zapping some sort of ray at a bunch of pigeons and snaps a picture. Dr. Doofenshmirtz walks up sipping coffee and says, "Pretty good, don't you think, Perry the Platypus?" When Perry runs off, Doofenshmirtz realizes he was talking to Perry, spits out his coffee and commands the pigeons to stop him, as he is heading for the clearly marked exit. The pigeons corner and trap him, and Doofenshmirtz takes this time to explain his plan. Today is the day his brother, Roger Doofenshmirtz, receives the key to the city, and Heinz decides to use this day to get his revenge. He plans to use pigeons to 'rain' on his brother's parade, and does so with his new and very evil invention... The Poop-inator. It implants an image of the target into the brain of the pigeon, with the bird then pooping on its target. Doofenshmirtz then tries to demonstrate on a pigeon perched on his finger, but the Poop-inator leaves the pigeon with no feathers instead. Doofenshmirtz then replies, "Eh. It works better from a distance."
Back in the backyard, Candace has lost the wrestling game 25 times to Stacy, and throws her controller onto the ground in frustration. The girls then hear Phineas calling Candace to come outside. They do so, with Candace wondering what they did now. Phineas tells her to check out her old tree house, which is now much bigger and better. Candace is still suspicious, but Stacy doesn't hesitate, taking Candace by the arm as they take a tire to the tree house. They walk inside, and Candace is marveling about how much nicer her tree house is with a jacuzzi, entertainment center, and hundreds of bells and whistles. While they keep walking, they get a buffet of soups, sandwiches, bagels, pizzas, and stews. Candace thinks that her brothers might have been replaced by aliens, to which Stacy replies, "Yeah, now they're gonna fatten you up so they can eat you!" They enter an elevator, and hear Phineas over a speaker say that they may began bouncing. Candace is confused, but Stacy has already started. Candace joins her friend as they bounce higher on a series of trampolines until they reach the top. They high-five and answer the phone (tin cans attached by strings) and tell Phineas that the tree house was great, and they thought of everything. Phineas tells them to press the 'THF' button. Candace wonders what 'THF' stands for until Stacy presses the button: 'Tree House Fight!' The girls think the idea is cool until they see the boys' tree house transforming as well. The girls scream and sit down, but then realize that the controls are just like the video game they played earlier that day, and that they could easily defeat Phineas and Ferb.
Stacy exclaims for them to bring it on, and they do. It starts with them seemingly dancing, where both sides are telling each other to stop leading. They pass through a backyard, and out into the streets, where Stacy commands Candace to give the boys the twister, a move that spins the opponent around and tosses them away. The boys realize they are about to crash. Ferb hits the 'Crash' button, which encases each one in a bunch of tires to protect them as they bounce around when they hit the ground, destroying a building in the process. Their tree house stands, and Phineas and Ferb do an unseen costume change into pirates, and send hundreds of rubber balls at Candace and Stacy. They are a loss of what to do, so Candace randomly pulls a lever, which shoots a bunch of water balloons at the boys. Ferb is knocked away, while Phineas drops his binoculars and is still bombarded with balloons. The bombardment finally stops, and the boys' tree house opens its mouth, releasing water and other things rush out, which grosses the girls out. Phineas exclaims, "Egad, man! It's an end run around the middle! Sound retreat!" Ferb salutes, and begins to play the bagpipes. They run away, with Candace and Stacy following. Candace then gets a call on her cell phone from her mother saying that she is at the car wash and should be home soon. Candace is shocked; until a can comes down from above and Phineas says that the last one home is 'big ol' purple pickled egg', which is followed by Ferb in a chicken costume while making a perfect clucking sound.
Back at Doofenshmirtz Evil Inc., Doofenshmirtz tells his daughter to fire the harpoon, which sends a line all the across for the pigeons to walk across, as they start to do so. He then tells Perry that he is about to witness a truly petty act of vengeance, but notices that Perry is gone. Perry escapes with the Poop-inator, and replaces the picture with one of Doofenshmirtz instead, which in turn causes the pigeons to attack Doofenshmirtz. When this happens, Vanessa turns and opens the elevator, but does not save it for her father, leaving him to be trapped in another elevator with all the pigeons.
The kids are still running, but trip over the harpoon line and tumble over each other all the way to the Flynn-Fletcher backyard, where they stand like normal trees. Their tree houses now look normal, with a bridge connecting the two. They fight over who got there first, even though it was a tie. Linda comes home and says that it seems as though they had fun, to which Phineas replies, "Well, Mom-you know what they say..." He is cut off by the girls who flung a water balloon at him, knocking him down. Ferb then finishes, "Fun never falls too far from the tree house!" He is also knocked down by a spare water balloon by the girls.
- Vincent Martella as Phineas
- Ashley Tisdale as Candace
- Thomas Sangster as Ferb
- Caroline Rhea as Mom
- Alyson Stoner as Isabella
- Dan Povenmire as Dr. Doofenshmirtz
- Jeff "Swampy" Marsh as Major Monogram
- Richard O'Brien as Dad
- Dee Bradley Baker as Perry
- John O'Hurley as Roger Doofenshmirtz
- Bobby Gaylor as Buford
- Olivia Olson as Vanessa
- Kelly Hu as Stacy
- Maulik Pancholy as Baljeet
- Before Ferb gets hit by the water ballooon, Ferb's closer eye appears larger.
- When Perry entered Doofenshmirtz's lair the roof was not there.
- When Dr. Doofenshmirtz sings My Goody Two-Shoes Brother, he threw his hat and it landed on his head. If he had actually threw it like that, it would have landed in front of him.
- At the end, when Stacy and Candace throw water balloons at Phineas and Ferb, Ferb's bigger eye is the one in front.
- Phineas and Ferb's backyard has only one tree, but in this episode there are two more (the ones they build the treehouses in).
- When Candace and Stacy first enter the elevator, the floor is brown but when they are in it it's a pink trampoline.
- Doofenshmirtz's plan was to only have his brother pooped on, but the way the pigeons were lined up, the audience would have been hit too.
- The tree houses' designs are inconsistent throughout the episode.
- The ropes Perry was tied up by the pigeons seems to disappear and appear throughout the episode.
- In this episode, Dr. Doofenshmirtz states every single person who he hates. He even states that Perry the Platypus is not the person who he hates the most, he hates his Goody-Two-Shoes Brother, Roger Doofenshmirtz.
- Phineas and Ferb made quite a few costume changes in this episode.
- Phineas' costumes (in order):
- Army uniform
- Pirate costume
- Camouflage uniform
- Knight's armor
- Chicken suit
- Ferb's costumes (in order):
- Army hat
- Sailor hat
- Camouflage helmet
- Scottish outfit
- Chicken suit
- This is the first time Adyson Sweetwater speaks, when the Fireside Girls are cheering her mouth moves on the line "Way to go!".
- When Phineas and Ferb are first shown in the episode it's likely they were talking about the question "If a tree falls in the forest, but no one's there to hear it, does it make a sound?"
- Heinz Doofenshmirtz has his first musical number.
- Candace initially wonders if the THF button is some kind of sound system. This is a reference to THX.
- The episode title is an allusion to "Three to get ready" (part of a standard count to prepare for action).
- The song Sk8er Boi can be heard in the background while Phineas, Ferb, Candace, and Stacy are rolling into their backyard.
- Stacy's response "I want the whole thing" is the same that Bob Barker used in "Happy Gilmore".
- Phineas said "I guess it would make a sound" may be a response to the philosophical question "If a tree falls in the forest and no one hears it, does it make a sound?"
- The scene where Isabella walks around with a sign is a reference to wrestling matches where a woman walks around the arena with a sign showing the current round.
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