The Doonkelberry Imperative

Here it is, this may be the only place in the world to get Doonkelberries right now.

When Mom is out of Doonkelberries for her famous Doonkelberry pie, the boys set out to find some for her. Meanwhile, Perry and Dr. Doofenshmirtz find themselves across the ocean as Doofenshmirtz returns home to renew his Drusselsteinian driver’s license. Back in Danville, Candace is convinced she has discovered the answer to her busting problem.

Episode Summary
Candace is sitting in her room, asking the "Phenomenon" why Phineas and Ferb's inventions always disappear. As she asks for a sign, she bumps her head into the wall behind her, which drops a book about disappearing objects from the above bookshelf. Meanwhile, Phineas and Ferb are sitting in the kitchen when Linda comes in, the boys would like a Doonkelberry pie but she's unable to find Doonkelberries in town, however, and not knowing where they come from, Phineas and Ferb search the Internet to find that Doonkelberries are the biggest export of Drusselstein.

At the front door, a package arrives for Perry from the O.W.C.A., which he opens. In it is a letter with a talking photo of Major Monogram attached. Monogram tells Perry that Dr. Doofenshmirtz is taking a trip to Drusselstein, and Perry must follow him there but giving him as attire. Afterwards, the package and letter self-destruct as Perry takes off after his nemesis.

In the backyard, Isabella and Baljeet help Phineas and Ferb build a trebuchet with which they plan to launch themselves to Drusselstein to collect the Doonkleberries themselves.

Meanwhile, Candace searches for a book in the Danville library called Disappearing Objects to help her bust her brothers. The librarian tells her, however, that it has been lent out to Heinz Doofenshmirtz. But Vanessa, who is visiting the library as well, tells Candace that Heinz is her father, and can help her look for the book in his house.

Perry arrives in Drusselstein, where he stops Doofenshmirtz. He informs Perry, however, that he isn't doing anything evil today, but is simply renewing his driver's license at the DMV. He then asks Perry to accompany him, which Perry accepts.

In Danville, Phineas and Ferb are ready to launch in the trebuchet. Baljeet uses a special machine to bring Drusselstein and Danville close together, which allows them to fly across rather than landing in the ocean. But when they finally reach Drusselstein and find a Doonkelberry stand, the seller tells them that they cannot export because the electricity-providing goat-powered machine for Drusselstein called the shaft is stuck, due to a feud between the people. The vendor explain that half the Drusselteinian population want their goats to walk to the right, and the other half want their goats to walk to the left, keeping the machine stuck from moving. Phineas, Ferb, and Isabella decide that they want to help resolve the conflict, and offer to help.

Doofenshmirtz and Perry enter the DMV and approach the desk. But much to Doofenshmirtz's dismay, the receptionist tells him that he will have to take a driving test in order to be re-certified. Perry comforts Doofenshmirtz and holds his hand as they walk out to the test.

Vanessa and Candace go to Doofenshmirtz Evil Incorporated and begin searching for the book. Vanessa explains as they search in the main lair that her dad is an amateur inventor. But while they look, they unknowingly turn on some of Doofenshmirtz's laser rays, which begin to make objects in the room disappear.

Phineas, Ferb, and Isabella try to negotiate with the Left and Right People, but fail, as neither side is willing to change the direction their goats move. However, they get another idea. On a mountain, Doofenshmirtz sits in a car with Perry, about to take his driving test. The leader gives the signal, and a mountain goat butts into the car, getting the unready Doofenshmirtz started on the test. Doofenshmirtz drives erratically all over town while Perry, scared, holds on tightly until they reach the finish line, nearly destroying the car and the populace in the process.

Candace sees a laser ray on Doofenshmirtz's balcony and looks through it, thinking it is a telescope. Seeing Phineas and Ferb's trebuchet in the backyard, Candace calls Linda, who is in the kitchen. Linda turns around, but as she does so, Candace inadevertly hits the fire button on the inator with her elbow, which makes the trebuchet disappear. Candace disappointingly leaves and tells Vanessa, who has finally found the book, that it isn't worth it.

Meanwhile, Phineas and Ferb explain that they can solve the problem of the machine. Ferb use a saw to cut at the shaft in the middle, causing it to technically be going left and right, solving the Drusselstinians' problem. They are rewarded with fresh Doonkelberries, and then take the people's trebuchet back home. The left and right side people argued again about with Phineas or Ferb name first of the day. Doofenshmirtz, having gotten re-certified, sees the Drusselstein trebuchet, and tells Perry he will take that home. Perry flies off, and Doofenshmirtz launches himself in his car towards Danville with the trebuchet. After eating pie, however, Phineas and Ferb see Drusselstein above them, and realize they forgot to separate Danville and Drusselstein. Baljeet fixes this using his machine again, causing Doofenshmirtz's car to fall into the ocean.

Songs

 * Drusselstein Driving Test Waltz

Perry's entrance to his lair
He receives his mission via mail and brief in a letter.

Evil Jingle
Drusselstein Department of Motor Vehicles and Goat Registration!

Background Information

 * Episode first revealed on page 10 of the Across the 2nd Dimension Official Movie Magazine in an interview with Dan and Swampy and was at the time only known as Unnamed Drusselstein Visit Episode.
 * First time Phineas, Ferb, and Isabella go to Drusselstein.
 * It is revealed that Drusselstein is powered by a big central shaft.
 * This episode reveals that Isabella's first patch is the "Medieval Siege Engine" Patch.
 * First time we learn the address of the Flynn-Fletcher residence (2308 Maple Drive, Danville USA)
 * First time Candace fires an inator that destroys evidence of the boys' creation, although this was not done intentionally.
 * This is the first time Vanessa does the Evil Jingle, instead of The Slacks, despite the fact she isn't evil. However, she does not mention her father's company, or even the word evil.
 * Due to a line by Doofenshmirtz, it seems that Perry had an accident during his ride with Doofenshmirtz. "I'll pay for the dry cleaning on your Rockenhosen." - Doofenshmirtz.
 * Doofenshmirtz's driving license expires on 30/12/2012.
 * If Candace had see all of Doofenshmirtz inventions disappear when she and Vanessa move one of Doofenshmirz's of other inventions, she would of figure out thats how Phineas and Ferb's inventions disappear.
 * At the 64th Primetime Emmy Awards, this episode is nominated in the category of "Outstanding Short-format Animated Program". This is the second episode to be nominated in this category, the first being "The Monster of Phineas-n-Ferbenstein".

Production Information

 * This episode was aired on Disney Channel on Demand on March 23, 2012.
 * This episode was paired with "Quietest Day Ever" when it originally aired on Disney Channel.

International Premieres

 * May 16, 2012 (Disney Channel Latin America)
 * July 7, 2012 (Channel 13 Chile)
 * July 9, 2012 (Disney XD Poland)
 * August 7, 2012 (Disney Channel Brazil)
 * August 9, 2012 (Disney Channel Israel)
 * October 6, 2012 (Disney Channel Asia)
 * October 21, 2012 (Disney XD Spain)
 * October 27, 2012 (Disney Channel Spain)

Errors

 * Phineas and Ferb made the goats go in different directions, but when their change of directions is being shown, both sides are going clockwise, yet people still think that they were going different directions.
 * Phineas does not address the problem that after their modification, half of the devices in Druelselstein will now spin in reverse.
 * When Perry throws the letter from Major Monogram away, Monogram's eyes and mustache are red.
 * When Perry is in the car with Heinz, his flower on his rockenhosen is gone. In the next scene, the flower is back.
 * When Doofenshmirtz is done with the driving test he is bald. Right after, his hair comes back.
 * Just before Doofenshmirtz is about to start the driving test, the shot shows that he is on a cliff. The previous shot shows a longer road.
 * When Candace mentions the rocket disappearing, it was actually Linda's fault that made the rocket fly away.

Continuity

 * Candace and Vanessa interact again ("S'Winter", "Hail Doofania!", "Finding Mary McGuffin", "Phineas and Ferb Summer Belongs to You!")
 * The picture of Doofenshmirtz's in his driver license is the same as the one in "The Lemonade Stand".
 * Fifth time Candace goes to Doofenshmirtz Evil Incorporated. ("Fireside Girl Jamboree", "Ain't No Kiddie Ride", "Run Candace Run", "Phineas and Ferb The Movie: Across the Second Dimension")
 * Candace mentioned the things Phineas and Ferb build disappears. ("Rollercoaster", "Out to Launch", "The Magnificent Few")
 * First episode in Season 3 and eighth episode overall that Baljeet appears without Buford. ("Phineas and Ferb Get Busted!", "Unfair Science Fair", "Unfair Science Fair Redux (Another Story)", "Attack of the 50 Foot Sister", "Day of the Living Gelatin", "Phineas and Ferb's Quantum Boogaloo", "Undercover Carl")
 * Second time Doofenshmirtz drives a lemon car. ("What Do It Do?")
 * Candace wants to bust her brothers despite the fact they're not home yet ("The Fast and the Phineas", "Put That Putter Away", "Unfair Science Fair Redux (Another Story)", "Attack of the 50 Foot Sister", "The Remains of the Platypus", "Perry The Actorpus").

Allusions

 * The disagreements between those who want the goats to move to the left and those who want them to move to the right satirizes the basic opposition of left-right politics. The two sides are depicted with blue signs for the left and red signs for the right, which are colors commonly used to represent the particular sides in the United States: blue for left (Democrats) and red for right (Republicans).
 * A Wrinkle in Time - The way the world seems to bend when Phineas and Ferb travel via trebuchet is very similar to the way a tesseract is explained in this famous novel.
 * The Big Bang Theory - The title of this episode is done in a similar style to a title of one that show's episodes.
 * Silent Hill - In the opening, where Candace is wearing a pyramid hat on her head, this is a reference to one of the villains in said video game series named Pyramid Head.
 * The car in which Doofenshmirtz does the driving test, resembles the much-derided and much-mocked Zastava Koral, otherwise known as the Yugo. This type of car is also seen in the 2011 Disney/Pixar film Cars 2 and 2011 Disney Channel Original Movie Good Luck Charlie, It's Christmas!.
 * Inspector Gadget - The self-destructing letter is a reference to the episodes in the series Inspector Gadget, in which Gadget's letter self destructs after being briefed.

Cast

 * Vincent Martella as Phineas
 * Ashley Tisdale as Candace
 * Thomas Sangster as Ferb
 * Alyson Stoner as Isabella
 * Caroline Rhea as Mom
 * Maulik Pancholy as Baljeet
 * Dan Povenmire as Dr. Doofenshmirtz
 * Jeff "Swampy" Marsh as Major Monogram
 * Dee Bradley Baker as Perry
 * Jennifer Grey as Svetka
 * Olivia Olson as Vanessa
 * John Hodgman as Zengle's Doonkelberry Stand Vendor (credited under Additional Voices)