Phineas says that being a pop star would be fun at first, but would then get dull quickly. He laments that there isn't a way to do it just once and quit. Mom explains that he is talking about a one-hit wonder. A flashback reveals that Linda Flynn was once known to the world as Lindana. Her song I'm Lindana and I Wanna Have Fun! rose to the top of the charts - but she immediately threw a diva tantrum and her song soon became elevator music. She sang one reunion concert years later, and never sung again.
She denies to the boys that this has happened, but have nonetheless inspired them. Phineas scribbles out a checklist of the steps needed to become a one-hit wonder. They now know what they're going to do today.
While Phineas and Ferb are working on writing their hit single (which,according to them, should be done by lunch), Stacy is helping Candace pick out her outfit for the audition. They go through lots of outfits (including something Candace found in her mom's closet: her Lindana outfit), finally ending with Candace's standard clothes, which Stacy says she should have tried on first.
Taking the toilet entrance, Perry heads to his lair where Major Monogram is waiting for him on his big screencommunication device. Major Monogram informs Agent P that Dr. Doofenshmirtz has been buying up construction toys at an alarming rate. Perry's mission is to find out what he is up to and put a stop to it. On his way to his mission, Perry pulls up alongside Linda's car at a stoplight. she looks over, sees him, then does a double-take. Thinking quickly, he puts on a disguise: Groucho glasses. Luckily, she buys it.
Candace and Stacy arrive at the audition, and Candace is shocked to see so many people there. She gets even more stage fright when she looks behind her and sees the rest of the crowd. Stacy gives her a pep talk and Candace gets overly excited, leaving her hair in disarray.
Just then, Jeremy Johnson, her secret crush, shows up. Candace fixes her hair and covers with, "And that is what a gorilla looks like when you try to take away its food." Jeremy explains that he is not there to audition, but to hear the hot new band, PFT. The hundredth contestant gets to sing on-stage with the band.
By coincidence, Candace goes through the turnstile as the 100th contestant.
She is rushed up on stage and finds out that PFT stands for "Phineas and the Ferb-Tones". Phineas is super excited to find out that Candace is the 100th contestant, proclaiming it will be "like a brother-sister thing." He hands her a sheet of music of their hit single, Gitchee Gitchee Goo, explains that the words are meaningless andnot to worry if she gets lost. The band starts singing.
Phineas is playing the guitar, Ferb is on keyboards and Isabella and the Fireside Girls are their backup singers.
The crowd is really getting into it, and Phineas cues up Candace. She is furious that the boys have beaten her to her dream of becoming a pop star and refuses to sing. She then threatens to tell mom and storms off the stage.
After the song, Ben Baxter from Huge-O-Records offers to talk about PFT's future. Phineas, showing how young he is, says, "Cool! He must be a psychic!"
After rushing off, Candace drags her mom back to the audition stage. Trying to bust her brothers, she points to shadows behind a curtain and tells her mom it's them. The curtain pulls back to reveal Marty the Rabbit Boy and his Musical Blender. Not believing that the boys were ever on stage, Linda takes Candace to get her eyes examined.
Meanwhile, Agent P arrives at the building where Dr. Doofenshmirtz has set up a second office. Still wearing the Groucho glasses, Dr. Doofenshmirtz mistakes Perry the Platypus as his new temp. He explains to the temp that he is just in time for his latest maniacal plan to "unleash an unprecedented reign of terror upon the entire Tri-State Area." Dr. Doofenshmirtz is aghast when Perry removes his disguise. Still confused that Perry is a temp, he asks, "Are times that hard?"
Candace steps into the parking lot wearing her new glasses, which she immediately rips off her face in disgust. There are advertisements all over town for the "PFT One City in One Day Tour". There's one on a bus that is driving away, but Candace is more interested in showing her mom the huge poster on the side of a nearby building.
Undaunted by the arrival of his nemesis, Dr. Doofenshmirtz throws the lever to activate his giant robot building. It extends its arms and legs and starts walking, wreaking havoc on downtown Danville. It comes to the building where the PFT poster is hanging, but stops and turns around thanks to Agent P's quick rewiring job.
In the meantime, Candace drags her mom out of the store to see the advertisement, but by the time they arrive, the building is gone. As it turns out, Phineas was allowed to put it up on the building for free because it was scheduled for demolition. On her way back into the mall to pay for the jacket she ran out with, the security guard recognizes her as Lindana, claiming to be a huge fan, but she still has to pay for the jacket.
Dr. Doofenshmirtz decides that he can't ignore Perry the Platypus any longer and traps him in a robotic type handcuff device. Thinking he's won, he relaxes with a "nice, tasty deli platter," which he offers some of to Perry, along with some freshly ground pepper.
At Huge-O-Records, Ben Baxter is trying to negotiate a contract with Phineas and the Ferb-Tones. Part of the deal is for a follow-up single. This is when Phineas decides to throw his one-hit wonder diva tantrum and storms out of the office and into the elevator with Ferb and the Ferbettes in tow.
Ferb pulls out the checklist and marks off "diva tantrum" and "elevator music."
Baxter concocts a whole bunch of ways in which they can use the one tape of their performance into merchandise for the next twenty years. One of the executives then points out the giant robot heading in their direction.
Meanwhile, the doctor keeps grinding until there's a very tall pile of pepper on the plate, which Perry blows into his face. Unfazed, Dr. Doofenshmirtz laughs until he figures out it wasn't him, but the robot, that Agent P wanted to make sneeze. The giant robot sneezes and blows Dr. Doofenshmirtz and Perry the Platypus into the Huge-O-Records building. On his way through, the tape gets caught up with them, out of the hands of Ben Baxter, and Perry uses it to grab hold of a flagpole and save himself. Dr. Doofenshmirtz lands on the top of a truck with a mattress on top of it. Unfortunately for Dr. Doofenshmirtz, it is from the Amazing Folding Mattress Company, which then proceeds to fold up with him inside. He is then squished by his own giant robot, shouting, "Curse you, Perry the Platypus!"
With Perry in tow, Phineas, Ferb, Isabella and the Fireside Girls hop on a bus back to the Googolplex Mall for their reunion concert. Marty the Rabbit Boy has just been announced as the winner. Jeremy talks some sense into a dejected Candace by explaining that if she wants to sing, she should just sing and not worry about busting her brothers and leaves.
Phineas then calls out to Candace, asking her whether she still wants to help them sing as the one-hundreth contestant. She takes the stageAdded by Happy2432, sings wonderfully with the band, and the crowd loves it.
Candace thinks that Phineas and Ferb are going to be her ticket to stardom. She realizes that she's been looking at her brothers all wrong, and that they're not nuisances at all. It is at this point that Phineas announces to the crowd that this is the last time that PFT will be singing that song. Candace is crushed. Everyone leaves and the lights are turned off, leaving Candace alone in the dark.
Teacher Harriett - Teaches as the Neighborhood School where Daniel Tiger and his friends attend. Has a hand puppet named "Ana Platypus", based on the same character from Mister Rogers' Neighborhood.
Dr. Anna - Dr. Anna is the Neighborhood physician.
Mr. McFeely - Mr. McFeely is the Neighborhood delivery man.
Grandpere Tiger - Grandpere is Daniel "Dad" Striped Tiger's father, and Daniel Tiger's grandfather. He likes to travel and sail in his boat.
Trolley - A red semi-anthropomorphic trolley car who takes Daniel and his friends anywhere in the Neighborhood of Make-Believe.
Daniela Tiger - Girlfriend of daniel tiger
Bullock Lion- arch enemy of daniel tiger & the whole nighberhood
Unknown world:Fictioncal city
Mr. & mrs. watterson
Unknown world:Doggie indenpentin world
Lucky (voiced by Eric McCormack) - The mutt alpha male of the group, and chief commander of the dogs' underground facility. Kind and clever but firm, he exudes authority and is often obeyed without question. He has a secret crush on Cookie, but he prefers to hide his feelings.
Cookie (voiced by Yvette Nicole Brown) - A tough-talking but kind and smart Boxer who is Lucky's second-in-command. She has a secret crush on Lucky and doesn't like her belly being touched. In Mutternal Instincts, she grows close to a puppy she affectionately names Cupcake and at the end, her family adopts her.
Niblet (voiced by John DiMaggio) - A huge and sometimes clumsy and slow-witted Old English Sheepdog with a soft heart. He has a little sister named Rebound (voice of Brooke Goldner).
Strudel (voiced by Alanna Ubach) - A genius Dachshund with a German accent who creates many of the inventions used by the Pound Puppies. She is usually assisted by squirrels due to her lack of opposable thumbs and is the most intelligent dog in the group. Her full name is Strudel diSchnitzel Von Wiener
Squirt (voiced by Michael Rapaport) - A Chihuahua. The smallest and most street-smart of the group; Niblet's closest companion in the series. He speaks with a New York accent, although in "I Never Barked For My Father", it is revealed that he was born in Hoboken, New Jersey.
Rebound (voiced by Brooke Goldner) An energetic young Old English Sheepdog, and Niblet's little sister. She is apart of the Super Secret Pup Club, which was introduced in Season 2. She is owned by Agatha McLeish.
Cupcake (voiced by Cree Summer) A puppy who is Cookie's adopted daughter. She is a member of the Super Secret Pup Club.
Patches (voiced by Jessica DiCicco) A Dalmatian puppy introduced in Season 2. He idolizes the Pound Puppies and is the leader of the Super Secret Pup Club
Lenard McLeish (voiced by René Auberjonois) - The short-tempered manager of Shelter 17. He really doesn't like his job and he wants a better job. He doesn't have a clue about the Pound Puppies' operations. He may have a sister, because the mayor is his brother-in-law.
Olaf Hugglesworth (voiced by M. Emmet Walsh) - The kind caretaker of Shelter 17 and McLeish's aide. He is in charge of new dog arrivals and assists pound visitors in finding a matching pet they could adopt. Like McLeish, he is unaware of the Pound Puppies' operations. He has started dating Gertrude the librarian as of the episode "Olaf in Love"
Agatha McLeish (voiced by Betty White) - The mother of Lenard. She hated dogs until she met Rebound whom she adopted. She is somewhat strict with Lenard, but dotes on Rebound.