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Mom's in the House

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Everything Phineas and Ferb build disappears when its finished, so if I keep them from finishing the thing they're building, it will never disappear.

Candace Flynn

When Phineas and Ferb can’t find Perry, they decide to create the Perrytronic 3000, a mechanical structure that can assume any form. Of course, being aware of the boys’ every move, Candace decides to take a different tactic on her busting approach by using a new technique that keeps Phineas and Ferb from finishing their Perry project. Meanwhile, Doofenshmirtz invents a Duplicator-Inator-2 so that he can duplicate his own head and make himself twice as smart.

Episode Summary

Phineas and Ferb are in the yard. Linda walks out and asks what they're going to do today, to which Phineas explains that they want to take Perry on a walk. Linda says that she's either going to make spaghetti and meatballs, or a spaghetti meatball, which is just spaghetti inside of a meatball. She heads to the store to get ingredients. Phineas asks Ferb where Perry is and it shows a quick image of different rooms of the house. He then decides to make a Perrytronic 3000, which Ferb then finishes his sentence by pulling out a blueprint.

At Doofenshimrtz Evil Incorporated, Perry circling around the building with bat like wings. Monogram explains the new evilness readiness programs will make Perry ready to strike while Doofenshmirtz watches and wonders why he's flying around in circles that is creeping him. As Doofenshmirtz declares his ready for his scheme, Peery dives in and punches him, before getting trap in a bird cage. Doofenshmirtz reveals his Duplicator-Inator 2, and it will give himself two heads, as "two heads are better than one" and installed his own microwave oven to powered it.

Back at the Flynn-Fletcher', Phineas tells Isabella to separate the eyes a little, as Perry's eyes are always out of focus. Baljeet asks what the Perrytronic 3000 will do, and Phineas explains that it has limitless ability. Inside Candace's room, she is yelling "Work! Work! Work!" which irritates Stacy. Candace explains to Stacy that it's her plan was to make Phineas and Ferb keep working with their invention so it won't disappeared that she called "Busy Bee Busting" or "B.B.Busting" for short. Stacy isn't convinced, so leaves, disappointing Candace. Meanwhile, Doofenshmirtz using the Duplicator-Inator 2 to create his second head, with a then drops to the floor and tells him to carry him and compliment each other that they like handsome.

Candace still doing the "B.B.Busting" technique, Candace gets the kids to do a "preliminary test" but won't let them completely finish it. Candace asks what do the Perrytronic do, and Phineas tells her as they about to take off that the theme song will tell everything. As they came back to the backyard, Candace asked them that it can transform anything else that Phineas conclude that they are not done yet with the Perrytronic. Candace calls Linda in the supermarket that she's coming home with the grocery but unknowingly left her her purse.

Doofenshmirtz and the second head can't come up with a good idea so decide to have fun and zap random things with the Duplicator-inator 2. They shoot Perry's arm, making a duplicate of it. The arm frees Perry, and the second head blames Doofenshmirtz on it. The second head tells him to hit him but Doofenshmirtz fires Duplicator-Inator 2 and accidentally make a bunch of Perry body parts. The head tells him to point the inator somewhere else that Doofenshmirtz continues to fire it out of the building and one of the beams goes past Phineas and Ferb's house.

Candace calls Linda that she is in the driveway bringing groceries inside and telling Phineas and Ferb to don't stop working on the Perrytronic. Candace asks her where she is, and she says she's in the front door. When Candace runs in, Linda isn't there, so she calls her again. Linda tells her that she in the bathroom, then to Candace's room and later in the kitchen and Candace runs to her again, Linda wasn't there either. After awhile, Linda drives off since the supermarket calls her that she left her purse and leaves, and Candace notices that there are two houses.

To fight off the Perry parts, Doofenshmirtz makes more out of him heads with the Duplicator-Inator 2. As they fight, two of Doofenshmirtz heads hold Perry in place with their mouths. Perry calls one of his copy arm and toss him towards the self-destruct button but it then disappears. Doofenshmirtz realizes that he still had the microwave attachment set to "Baked Potato", meaning that whatever he made would disappear after about three minutes. At the house, Linda pulls up and Candace tries to show her the two houses, but the second house disappears. Candace doesn't care, because the Perrytronic is still in the backyard.

Doofenshmirtz fight two of Perry's arms but quickly disappears. Perry is surrounded by Doofenshmitz's heads, but they also disappear. With one head left to defeat, Perry grabs a golf club and uses it to destroy the Duplicator-Inator 2 and Doofenshmirtz tries to stop Perry by throwing his second head but missis him and throws off the balcony with the inator fires a beam. The head comments that he should have disappeared before hitting the ground and cursus Perry but cut off when he disappears. Doofenshmirtz tries to know what his second head was going to say until Perry destroyed the Duplicator-Inator 2 and leaves via jetpack that Doofenshmirtz knows now what he was going to say.

At the same time, Candace tries to get Linda to see the Perrytronic while she making the spaghetti meatball but decides to order pizza. When Candace tries to show her the Perrytronic, but the beam hits it. The two Perrytronics hit each other, and tumbles away from the backyard just as Candace brings Linda out, who only sees the real Perry. She invites the kids in for pizza and ice cream sandwiches. Ferb replies he only wants pie. Candace, who is disappointed and saying that now she has to "but-but-but".


Running Gags

The "Too Young" Line


Ferb's Line

Linda: Who wants pizza?

Phineas, Isabella, Baljeet, Buford: Me!/I do!
Linda: Then ice cream sandwiches. Ice Cream cut into shapes of a sandwich.
Ferb: Just pie for me, please.

Candace: Okay, now I have to "but-but-but".

Whatcha doin'?


Perry's entrance to his lair


Evil Jingle

Doofenshmirtz Evil Incorporated!

Memorable Quotes

Candace: There is a madness to my method.

Stacy: You've got three seconds.
Candace: Everything Phineas and Ferb build -- disappears when they're finished. So if I can keep them from finishing the thing they're building, it will never disappear! I call it Busy Bee Busting. B. B. Busting, for short.

Stacy: You know what? I'll see you, La-La-Later.
Candace: What is this heap of junk anyways?

Phineas: Don't worry, the theme song will explain it all!

Candace: Theme song?!
Dr. Doofenshmirtz: All my live I've been a zero, but with two heads I'll be twice that!
Dr. Doofenshmirtz head: Oh look what you've done you Dummkopf!

Dr. Doofenshmirtz head gets punched by Perry arm.

Dr. Doofenshmirtz: Oh, who's the Dummkopf now, Dummkopf?
Perry sends duplicate hand towards Duplicator-Inator-2's Self Destruct button.
Dr. Doofenshmirtz: No! (Hand vanishes) What? It just vanished? What's wrong with this thing? (Turns Duplicator-Inator-2 around) Oh, the microwave was on the baked potato setting. So I guess everything's just going to last for three minutes. My bad.
Dr. Doofenshmirtz head: Ah! Ow! ow! ow! ow! ow! Oh, why couldn't I have disappeared before I hit the ground? Curse.. (disappears)
Dr. Doofenshmirtz What? Now we'll never know what he was going to say. (Duplicator-Inator-2 explodes and Perry flies off on jetpack.) Oh, yeah, yeah that.

Background Information

Production Information

  • This episode appeared Disney Channel on Demand on February 24, 2012.
  • Along with "Minor Monogram", this is the fourth-longest time an episode had its segments premiere seperatly.

International Premieres

  • March 10, 2012 (Disney XD Latin America)
  • May 12, 2012 (Disney Channel Poland)
  • June 8, 2012 (Disney Channel Asia)
  • August 6, 2012 (Disney Channel Latin America and Brazil)
  • September 22, 2012 (Disney Channel Portugal)
  • September 23, 2012 (Disney XD Spain)
  • December 9, 2012 (Disney XD Latin America)
  • January 1, 2013 (Disney XD Canada)


  • Perry enters D.E.I. with a pair of wings and is trapped in the cage, but later on the wings disappear while he is in the cage.
  • Although the first head to be duplicated was created first, it was the last to disappear, longer than the others created which should have lasted only for 3 minutes.
  • When Doofenshmitz's first head tells Doofenshmirtz to hit him, Doofenshmirtz hits the Duplicator-Inator 2 button 3 times, hitting Perry's hand and tail. But in the next scene, more than three of Perry's hands and tail were shown.
  • Before Doofenshmirtz throws his duplicate head, his hair is dark brown instead of light brown.
  • Candace knocks on the bathroom door to get Mom out, but the door is for Mom's bedroom. (Identified by the pictures on either side)
  • When Doofenshmirtz's second head is yelling at him for accidentally letting Perry out of the cage, Doofenshmirtz's eyes are red.
  • This episode reveals that there is an empty lot next door to the Flynn-Fletcher house, but in previous episodes, there is another house in that empty lot.
  • After the song Perrytronic, while Candace is telling the boys she is telling her mother, Isabella's hair is all blue.
  • Candace shouldn't have tried to bust Phineas and Ferb for building the second house because they didn't build it.
  • When Linda looked out the window seeing the fence of the duplicated house, she should've seen the house itself.
  • On the word "Juvenile", the seventh Doofenshmirtz head's mouth moves, but the heads were heard saying in in unison.
  • When Candace turns around to see the house duplicate, her eyelashes disappear.
  • Candace runs from the bathroom upstairs to her room when the bathroom should really be upstairs.


  • Gigantor - The Perrytronic theme parodies the theme to the '60s anime about a giant robot.
  • The Wizard of Oz - When Perry is trapped in the cage, he closely resembles the flying monkeys.
  • The Addams Family - When Doofenshmirtz makes a duplicate of Perry's arm it lands, and moves in a way similar to that of Thing.
  • Angry Birds - When Dr. Doofenshmirtz throws his duplicate heads, the heads have a similar shape to the yellow birds.


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