"Happy Birthday, Isabella"
Birthday for Isabella revealed
Phineas and the gang revealing Isabella's birthday party.
Season: 4
Production code: 409b
Broadcast number: 194
Story by:
Scott Peterson
Written & Storyboarded by:
Kim Roberson
Directed by:
Robert F. Hughes
"Assistant Director":
Russell Calabrese
Broadcast Information
Disney Channel US Premiere:
July 12, 2013
Disney XD US Premiere:
August 3, 2013
International Debut:
August 16, 2013 (Disney Channel Brazil and Latin America)
See more...
Paired with
"La Candace-Cabra"
I wish for time alone with Phineas.

— Isabella Garcia-Shapiro

It's Isabella's birthday, and Phineas and the gang celebrate it in a big way, complete with a giant cake and piñatas. To Isabella however, all she really wants is to be alone with Phineas, but she keeps missing by a second. Meanwhile, Doofenshmirtz installs his Bugs Me-Inator onto an evil bug bus and drives around Danville turning all the things that bug him literally into bugs, and Stacy unwittingly sees this and even finds out Perry's agent secret.

Episode Summary

Candace and Stacy are gathering snacks for their viewing of a horror movie, The GrievanceStacy leaves when Candace becomes more focused on what Phineas and Ferb are doing, which is planning a surprise for Isabella's birthday. 

After Perry enters his base, Major Monogram informs him of Doofenshmirtz's latest scheme. Doofenshmirtz has been seen driving around in a large truck equipped with a machine that turns objects into bugs. Perry leaves to stop him.

Back in the backyard, everybody continues planning for Isabella's party, just as she walks in and greets Phineas. He doesn't want her to see what is planned, so he has Buford take her away, which he does by putting her in a burlap sack. After he leaves, she explains to herself that all she wants for her birthday is some alone time with Phineas. Just after she gets home, she sees her birthday celebration.


Buford bagging Isabella to avoid spoiling her surprise.

Across town, Perry catches up with Doofenshmirtz on his "Bug Bus" but can't get to him due to his "Platypus-proof" bubble around him. He then explains to Perry about some things that bug him, such as portable outhouses and high voltage signs. Due to these aggravations, he created the "Bugs Me-inator". He explains that since he can't stand bugs, he made the bubble. Perry tricks him out of the bubble by showing him that a bug is in there with him. After Doof opens the bubble, Perry punches him, sending Doof swirling around. Doof then tries zapping Perry with his inator, but misses and hits his shoe. He then chases Perry around the top of the bus. He lunges at Perry, misses, and swirls around the bubble again. With no one at the wheel, the bus careens wildly around the town.

The Bus eventually crashes into Stacy's house, where she has been watching the movie. Scared from both the movie and the crash, Stacy notices Perry, and asks why he is wearing a hat. 

Who's This Pharmicist

Who's this pharmacist?

In Isabella's yard, the birthday celebration continues with the unveiling of a freakishly large red velvet cake, "with a special surprise". Isabella climbs up to the top of the cake, and makes her wish to spend time alone with Phineas. She blows out the candles, which shoots confetti fireworks into the air. Holly notices Candace waiting anxiously on her phone, and wonders what she is doing. Phineas asks if she got her wish, but Buford interjects, sarcastically saying that it was her wish to have her entire yard littered with confetti. Candace tells her that when things dangerous she will call Linda to bust Phineas and Ferb. Holly questions why she didn't call about the confetti, but Candace assures her that it will get worse. 

At Stacy's house, she wonders what is going on, and Doofenshmirtz explains to Stacy the basics of their routine. Perry tackles Doofenshmirtz, where Doof notices the cover of The Grievance on the floor. He says he saw it in the theater, and that he still has nightmares about the "greasy little girl who comes out of the basement". Stacy interrupts him, not wanting to know how it ends.

P07-14-13 16.54

Ooh, ahh!

Next in the birthday celebration is a giant piñata which then splits into many smaller piñatas. After the piñatas are done, Phineas initiates the grand finale, a giant structure that rises out of the pool. The finale is unseen as Candace calls Linda to tell her to come across the street. As the guests awe at the "grand and glorious and potentially bustable gift", Candace runs across the street to grab Linda and take her to Isabella's house.

As Stacy tries to tell Perry and Doofenshmirtz to stop, she falls into the oil that was leaking onto the floor. She stands up, with oiled hair blocking her face. Doofenshmirtz sees Stacy and believes she is the "greasy Grievance girl from the basement" and flees in terror. As she asks Perry if the Flynn-Fletchers know about him fighting Doofenshmirtz, she steps on the Bugs Me-inator's trigger button. After if fires a beam, Perry destroys the -inator. The beam bounces off of a satellite, reflecting it back to Earth.

At the exact moment Candace is bringing Linda to Isabella's house, the beam comes into the backyard, where it turns the finale into a large amount of butterflies. Isabella is amazed, but Phineas and Ferb are confused as to what happened. Candace comes in and sees the gift is gone, now with butterflies in its place, and Linda thinks that the boys did this and loves it, wondering how long it took for them to collect them all.

Major Monogram, Carl, and several other people pull in front of Stacy's house, disguised as people from Danville Water and Power. Perry takes Stacy outside, and hands her the pamphlet explaining about host families and memory erasure. Not wanting to have Candace or the boys lose Perry, and also not wanting her memory erased due to not wanting to watch the movie again, Stacy exploits a technicality, saying that she is not part of his host family. She asks if it can be their secret. Perry thinks about it, then smiles and tips his fedora, agreeing with Stacy's wishes. To enforce this, Perry has Stacy lie to Monogram about not being home, which he buys. Perry and Stacy give each other a thumb's up.

Can we Keep this a secret

Stacy and Perry keeping his identity a secret.

All of the guests wish Isabella a happy birthday and leave her with Phineas and Ferb in front of her house. Phineas apologizes for the ruined finale, but Isabella consoles him saying that she loved the butterflies. To make it up to her, Phineas offers that if he and Ferb can take her out for some ice cream. As she was about to answer, Ferb lies that he has something that he needs to do, and that they should go. Phineas agrees, and Isabella fist bumps Ferb, thanking him for finally giving her some alone time with Phineas.

At the ice cream shop, Phineas again asks if she got her wish, but then remembers the confetti and streamers, actually believing Buford's comment. As he leaves the table to get more napkins, she watches endearingly, rests her head on her hands and silently says "And butterflies. You always give me butterflies...".


For a full transcript of "Happy Birthday, Isabella", click here.


End Credits

No one suspects a thing

Stacy glad that no one knows.

Sometime later, Candace and Stacy are spying on the kids. Candace sees Phineas saying "Where's Perry?" and asks Stacy where she thinks the platypus went. Stacy quickly and nervously responds that she doesn't know anything about where Perry goes every day. Candace agrees, wondering why she asked Stacy in the first place; in her mind, Stacy is glad that no one suspects anything.


Happy Birthday, Isabella title card
The image gallery for "Happy Birthday, Isabella" may be viewed here.

Running Gags

I know what we're gonna do today


The "Too Young" Line


Ferb's Line

Ferb: I...just...remembered there's...something I need to do. You two go.

What'cha doin'?

Isabella: Hi, Phineas. What'cha doin'? You're not planning something for my birthday, are you?

Phineas: Don't look, don't look, don't look! Nothing to see here.
Isabella: Phineas. But I only really want for my birthday is-

Phineas: Don't ruin the surprise. (Nervously laughs) Buford, get her out of here.

Hey, where's Perry?

Phineas: Building supplies? Check. Guest list? Check. Perry? (looks around) Hey, where's Perry?
Stacy: Yeah, where does that platypus go everyday?
Candace: Ah, look at them out there. What are they up to? Ah, it looks like Phineas is saying, "Where's... Perry?" Huh. Where do you think Perry goes every day, Stace?

Stacy: (rapidly) How do I know? Why are you asking me? How should I know? Uh, don't look at me!
Candace: (after a pause) Eh, I don't know why I was asking you.

Stacy: (in her head) Whoof! No one suspects a thing.

Oh, there you are, Perry

Major Monogram: Agent P.? (The lights flicker on) Ah, there you are.

Perry's entrance to his lair


Evil Jingle


Mistaking Doofenshmirtz for a pharmacist

Stacy: OMG! Perry! What are you doing here?! And why are you wearing a hat? Look out! (Doofenshmirtz flies onto the couch) And who's this pharmacist?

Doofenshmirtz: Really? Really? W-why does everyone just stampede to that conclusion? Other people wear lab coats you know. Why, why don't you say, "Oh look a rocket scientist." Or a veterinarian?
Stacy: Are you a veterinarian?

Doofenshmirtz: No... But that's not the point.

Memorable Quotes

Candace: Phineas and Ferb! What are you guys up to?

Phineas: It's a surprise for Isabella's birthday!
Candace: A surprise...
Stacy: Here we go again.
Candace: ...for Isabella's...
Stacy: Give me those sodas.(She grabs the sodas Candace was holding)
Candace: ...Birthday.

Stacy: See ya. (She walks off)
Buford: (carrying Isabella in bag and letting her out) I've carried a lot of squirmin' bags in my time, but this is the first time I knew who was in it. (walks off)

Isabella: Augh! What I was going to say was all I want for my birthday is some alone time with---(motions to Phineas) Never mind. (walks out)

Baljeet: You wanted to be alone with this bag?
(on the cake)

Baljeet: Ooh, I hope they do not have a male dancer popping out of it.

Buford: They asked, but they couldn't afford me.
Holly: (To Candace) What are you doing?

Candace: Waiting for things to get dangerous, so I can my mom to come bust the boys.
Holly: That's not dangerous?

Candace: Dude, this is nothing, it'll get worse.
Phineas: So, did you get what you wished for?

Isabella: Uh-

Buford: (sarcastically) Yeah, it's every girls wish to have her backyard covered in litter.
Stacy: Wait a minute! It says right here in your silly little pamphlet that if your host family finds out about your agent status, then anyone who's seen you has to have their memory erased, or you'll get relocated. Perry, I'm not part of your host family! I know, I know, it's a technicality. Look, I don't want Candace and the boys to lose you, but I also do not want my mind erased. I'm on the last ten minutes of that Grievance movie, and I don't want to have to watch that whole scary mess again. So, uh, can we just keep this a secret?
(Perry smiles and tips his fedora to Stacy)
Phineas: I still can't figure out what went wrong with the grand finale. After the laser light show and the fireballs, the swans should have been released and--

Isabella: Phineas, I really liked the butterflies. Thank you.
Phineas: Well to make it up to you, it's kinda lame but... maybe Ferb and I could, I don't know, take you out for some ice cream or something?
Isabella: Uh-
Ferb: I... just remembered there's... something I need to do. You two go.
Phineas: Is that cool?

Isabella: Yes, very cool. Ferb. (fist bumps Ferb)
Phineas: So, did you get what you wished for? Oh yeah, I already asked that. Confetti and streamers! Hold on, gonna get another napkin. (leaves)
Isabella: (to herself) And butterflies. You always give me butterflies.

Background Information

  • It is revealed that Doofenshmirtz gets annoyed when people think he is a pharmacist because of wearing a lab coat. He previously vented about this in an interview with and on Twitter.

Production Information

  • Héctor Ireta De Alba (Latin American voice of Baljeet) confirmed this episode on YouTube.[1][2]
    • Dan Povenmire was later thought to confirm this episode via Twitter; however the scene was actually from "La Candace-Cabra", the episode that this one is paired with.[3]
  • This episode was aired on Disney Channel on Demand and on Time Warner Cable on July 5, 2013.
  • The title was originally announced as "Isabella's Birthday".
  • An advert for both the paired episodes was released on July 5th.
  • This episode aired exactly five years after "Traffic Cam Caper" and "Bowl-R-Ama Drama".
    • Coincidentally, Bowl-R-Ama Drama had Candace see Perry as a secret agent for the third time, while Happy Birthday, Isabella is about Stacy seeing Perry as a secret agent for the first time.

International Premieres

  • August 16, 2013 (Disney Channel Brazil and Latin America)
  • September 12, 2013 (Disney XD Poland)
  • September 13, 2013 (Family Channel, Canada)
  • September 14, 2013 (Disney XD Latin America)
  • September 23, 2013 (Disney Channel Russia)
  • October 11, 2013 (Disney XD Germany)
  • December 1, 2013 (Disney XD Spain)
  • December 2, 2013 (Disney XD Italy)
  • January 12, 2014 (Disney Channel Hungary)
  • January 15, 2014 (Disney Channel Portugal)
  • February 9, 2014 (Disney Channel Asia)
  • October 19, 2014 (RCTI Indonesia)


  • When Isabella is singing in the street, as Phineas and Ferb go past with the giant baby head, the white patch of her left shoe is purple.
  • When Isabella first enters her back yard, there are two Sallies in the crowd.
  • When Phineas introduces Isabella to her birthday cake, Adyson's headband was the same color as her hair.
  • When Isabella starts saying "Butterflies? I love butterflies!", her mouth isn't moving.
  • When Isabella takes off her blindfold, her striped party hat falls off revealing her signature bow, she still has it when Buford bags her and takes her to the pool. Later, when the finale raises out of the pool, the hat reappears.
  • When Ferb brings the cake out, the candles are already lit, but then Ferb presses a remote to light them.
  • The stairway to lead Isabella up to the top of the cake suddenly appears from nowhere after the candles were lit.
  • After the candles spray confetti, Holly can be seen next to Adyson, but in the next shot she is next to Candace.
  • When the finale gets turned into butterflies, look closely at Candace in the background; she walks in front of a patio post.
  • When Candace dials Linda's number, she dials 6 numbers instead of 7.
  • When Stacy walks towards Dr. Doofenshmirtz covered in oil, the oily part of her hair bow turns transparent for a single frame.



  • Ring - The "greasy girl who emerges from the basement" in the film The Grievance, as described by Dr. Doofenshmirtz and accidentally imitated by Stacy, resembles Sadako and her emergence from the television.
    • The Grudge - The title of the film Stacy watches, The Grievance, is a synonym for the title of the 2004 horror film.
  • Give It 2 Me - When Isabella sings "I'll take it" in "Isabella's Birthday Song", she is imitating Madonna because both say the same thing with the same melody.
  • Slenderman - The way the "grievance girl from the basement" seems to teleport toward the camera and the static as she comes closer hold a likeness to what the player of this videogame series will see right before Slenderman kills them.
  • The Music Box - The classic Laurel and Hardy short is parodied once again with Phineas and Isabella. Only this time, they move a grand piano up the steps instead of an upright piano. (Phineas and Ferb The Movie: Across the 2nd Dimension)
  • ING Direct - Candace's line "I know what INAP means" is a direct parody of the ING commercials where the banking group's logo was explained to a person asking "What's That?" The question was not about ING (which the recipient already knew), but some outrageous background spectacle similar to many of Phineas and Ferb's big ideas.


  • Tenth time a character's birthday is celebrated or mentioned, the first nine being Candace ("Candace Loses Her Head"), Dr. Doofenshmirtz ("Raging Bully"), Linda ("Mom's Birthday"), Vanessa ("Dude, We're Getting the Band Back Together"), Hildegard Johnson ("Run, Candace, Run"), Phineas ("Phineas' Birthday Clip-O-Rama!"), Sergei Kushnarov ("Mommy Can You Hear Me?"), Stacy ("Doofapus"), and Major Monogram ("Backyard Hodge Podge"), and the third episode with "Birthday" in it ("Mom's Birthday", "Phineas' Birthday Clip-O-Rama!").
  • Second time Isabella's name has been part of an episode title. ("Isabella and the Temple of Sap")
  • Third time Isabella tries to go out with Phineas ("Out to Launch", "Canderemy"), and the fourth time she tries to be alone with him ("Phineas and Ferb Summer Belongs to You!").
    • For both, this is the first time she is successful.
  • Fifth time someone who doesn't work with the O.W.C.A. discovers Perry's secret identity ("The Ballad of Badbeard" - although Candace believed she was under the influence and hallucinating at the time, - "I Was a Middle-Aged Robot" - although Lawrence trips over a cord and goes into the Memory Eraser, which was also used to make Balthazar forget seeing Perry, Phineas and Ferb The Movie: Across the 2nd Dimension, "Perry The Actorpus" - although it was only seen in an advertisement).
    • Second time Perry's "So You've Found Out Your Pet is a Secret Agent" pamphlet appears. (Phineas and Ferb The Movie: Across the 2nd Dimension)
    • Stacy discovers that Perry is a secret agent, but exploits a loophole in the rules to retain her memory since her family is not Perry's host family.
    • Stacy has previously seen Perry as an agent before when he had Candace's body ("Does This Duckbill Make Me Look Fat?"). She came close to seeing Perry in 2-legged agent mode before in "Elementary My Dear Stacy" when she saw Big Ben rocketing away and Perry was fighting Dr. Doofenshmirtz on the other side of Big Ben from Stacy's view.
    • Stacy is the second person lucky enough to actually remember both of Perry's identities, the first being Candace and the third being Milo.
  • The Giant Floating Baby Head appears again.
  • Melissa reappears. ("We Call it Maze")
  • Doofenshmirtz is once again mistaken for a pharmacist.
  • Third time a character says "O.M.G.". ("Split Personality", "Phineas and Ferb and the Temple of Juatchadoon")
  • Part of the Big Idea is unseen, like the Big Ideas in "Candace Disconnected", "Blackout!" and "Sidetracked" were unseen.
  • We never learn what the Grand Finale is, but we know that it included swans, lasers, and fireballs according to Phineas.
  • Third time every Fireside Girl has a speaking role. ("Isabella and the Temple of Sap", "Bee Story")
  • First episode where Stacy interacts with Doofenshmirtz and Major Monogram.
  • Fifth (or possibly sixth) time someone keeps trying to tell Phineas something, but continually gets cut off. ("Ready For The Bettys", "Out to Launch", "The Chronicles of Meap", "Canderemy", "Hail Doofania!")
  • Third episode to involve Isabella's yard. ("Day of the Living Gelatin", "Happy New Year!")
  • Second episode where the Soda Fountain ice cream shop is seen. ("A Real Boy")
  • It's ironic for Candace to try to bust her brothers on Isabella's birthday despite that she and Isabella are friends.
  • First episode where Isabella's crush on Phineas is largely involved.
  • Second episode with "Happy" in it ("Happy New Year!").
  • Second episode where Doof loses a shoe. ("Bully Bust")
  • Stacy leaves Candace while she's in busting mode again. ("Meapless in Seattle", "La Candace-Cabra")
  • Third time Monogram stays in the dark, second time Carl makes a laugh ("Gi-Ants", "Blackout!")
  • Lawrence is not seen, but makes a cameo on Isabella's "emotional roulette" in the song.
  • Stacy has seen Perry in secret agent mode before in "Across the 2nd Dimension" and was one of the characters to have their memories erased at the end. Here, she finds out Agent P again and does not have her memory erased.
  • Second time a person from Perry's pet life who accidentally discovered him as a secret agent (Stacy) unintentionally defeats Dr. Doofenshmirtz by getting covered in a substance that makes them look like a creature of which he is afraid ("The Ballad of Badbeard").
    • Candace got covered in seaweed and was mistaken for a sea hag, while Stacy got covered in oil and was mistaken for the Grievance girl.
    • Both times, Perry allows that person to remember his identity. He let Stacy remember because she is not part of his host family and did not want to see The Grievance again. It is unknown why he let Candace remember his identity, but the most likely reason is that he gave her a pass for saving him from the crocodiles and didn't want to discredit her, so he trusted her to keep his identity a secret from everyone else.
      • Phineas and Ferb Get Busted! showed Perry having a nightmare about what would happen if Candace inadvertently blew his cover to the rest of the family.



"La Candace-Cabra"
Episodes Next:
"Love at First Byte"
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