Phineas and Ferb Trivia
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99 free Phineas and Ferb trivia questions with answers — entertainment quiz, new questions added Oct 2026.
54 free Phineas and Ferb trivia questions with answers. Phineas and Ferb ran for four seasons, two movies and a Marvel crossover before coming back for a fifth season in 2025, and it packed every episode with running gags worth quizzing on. This trivia covers the whole tri-state area: Perry's double life at O.W.C.A., Doofenshmirtz's childhood in Gimmelshtump, Candace's busting, Isabella's Fireside Girls, the songs that Disney demanded in every episode, and the behind-the-scenes story of two Simpsons layout artists who pitched the show for sixteen years. Early questions are for anyone who has watched the show with a kid or been one. Later ones get into voice casts, guest stars, the Spanish theatrical release and the length of Ferb's longest speech, so long-time fans have something to fight over. Every answer has been checked against Wikipedia's articles on the series, its characters and films, and each question shows its source once you have answered.
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Q 01What kind of animal is Perry, the boys' pet and secret agent?
A platypus
A platypus was chosen because kids could not beg for one at a pet store and it was obscure enough that the creators could make things up about it.
Q 02How many days of summer vacation do Phineas and Ferb have, according to the theme song?
104
104 days is the count in the theme song's first line, 'There's 104 days of summer vacation, and school comes along just to end it,' the premise for every single-day episode.
Q 03In which fictional city do the Flynn-Fletchers live?
Danville
Danville is the boys' hometown, set in an unnamed tri-state area that the local evil scientist is forever trying to conquer.
Q 04What is the name of the evil scientist Perry battles in almost every episode?
Dr. Heinz Doofenshmirtz
Dr. Heinz Doofenshmirtz, voiced by one of the show's co-creators, runs Doofenshmirtz Evil Incorporated, and almost every one of his contraptions ends in '-inator'.
Q 05What do the letters O.W.C.A., the agency Perry works for, stand for?
Organization Without a Cool Acronym
Organization Without a Cool Acronym is the joke name behind O.W.C.A., the animal spy agency run by Major Monogram that dispatches Perry through a chute under the Flynn-Fletcher house.
Q 06Who created Phineas and Ferb?
Dan Povenmire and Jeff 'Swampy' Marsh
Dan Povenmire and Jeff 'Swampy' Marsh, who had met as layout artists on a primetime animated sitcom in the 1990s, pitched the show to network after network before Disney picked it up.
Q 07What is Isabella Garcia-Shapiro's famous catchphrase?
Whatcha doin'?
Whatcha doin'? is Isabella's greeting nearly every time she finds Phineas, and she bristles when anyone else says it; the character was named after one co-creator's eldest daughter.
Q 08Isabella leads which scout-style troop?
The Fireside Girls
The Fireside Girls, Troop 46231, earn accomplishment patches for almost anything, and Isabella is their troop leader; a planned spin-off about the troop never went into production.
Q 09What is Candace's overriding goal in nearly every episode?
To 'bust' her brothers to their mother
To 'bust' her brothers to their mother is Candace's daily mission, and it fails when the invention vanishes; the co-creators have said the boys' projects are just the setting while Candace carries the plot.
Q 10Who voices Candace Flynn?
Ashley Tisdale
Ashley Tisdale has voiced Candace since the 2007 pilot 'Rollercoaster'; the show got its sneak preview on Disney Channel right after the premiere of a musical film in which she starred.
Q 11What is the name of the boy Candace has a crush on and eventually dates?
Jeremy Johnson
Jeremy Johnson works at Mr. Slushy Burger and plays guitar in a band called The Incidentals; Candace's crush becomes a relationship by the hour-long special 'Summer Belongs to You!'.
Q 12Phineas and Ferb are related how?
Stepbrothers
Stepbrothers: Phineas is Linda Flynn's son and Ferb is Lawrence Fletcher's, a blended family modeled on one co-creator's own upbringing and, the creators felt, underused in children's programming.
Q 13What geometric shape is Phineas's head famously drawn as?
A triangle
A triangle was the shape one co-creator first doodled as a 'triangle kid' on butcher paper at a restaurant in 1993, and a hidden triangle became a running background Easter egg in the series.
Q 21What is the name of Doofenshmirtz's goth teenage daughter?
Vanessa
Vanessa knows all about her father's nemesis, and in 'Act Your Age', set ten years later, she and a grown-up Ferb go out on a date.
Q 22Norm, Doofenshmirtz's giant robot, is designed to look like what?
A mild-mannered businessman
A mild-mannered businessman was the model, complete with suit and tie, because in the evil scientist's logic 'the enemy of platypus is man'; Norm debuted in 'Greece Lightning'.
Q 23What is the name of Major Monogram's unpaid intern?
Carl
Carl Karl is the unpaid intern who runs Monogram's monitors and tech; he briefly turned evil and took over the agency in the special 'Phineas and Ferb Save Summer'.
Q 14Which band performs the theme song 'Today Is Gonna Be a Great Day'?
Bowling for Soup
Bowling for Soup recorded the theme after the network asked for a rock version of the slower, 'classic Disney' number the creators had first written.
Q 15Which stock question, usually answered 'Yes, yes we are', gets asked of Phineas by adults every episode?
'Aren't you a little young to…?'
'Aren't you a little young to…?' gets asked by every adult who meets the boys mid-project, including a Mount Rushmore ranger while they carve Candace's face into the monument, and the answer is 'Yes, yes we are.'
Q 16What accent does Ferb speak with?
British
British is Ferb's accent because Thomas Sangster, the English actor from Love Actually, voiced him through the original run; one co-creator had himself lived in England for years.
Q 17Who replaced Thomas Sangster as the voice of Ferb from the 2020 movie onward?
David Errigo Jr.
David Errigo Jr. took over Ferb for Candace Against the Universe in 2020, having already voiced him in a 2019 crossover on the creators' follow-up series.
Q 18From which fictional European country does Doofenshmirtz hail?
Drusselstein
Drusselstein is the evil scientist's homeland; his flashbacks return to the village of Gimmelshtump, where his parents once made him serve as the family lawn gnome.
Q 19What was Doofenshmirtz's job before he became an evil scientist?
Bratwurst street vendor
Bratwurst street vendor was his trade until, as he tells it, the hot dog industry drove him out of business and into evil science.
Q 20Doofenshmirtz's younger brother Roger holds what job?
Mayor of Danville
Mayor of Danville is Roger's office, which is why so many of Heinz's schemes target City Hall; Heinz insists Roger is their mother's favourite and sang 'My Goody Two-Shoes Brother' about it.
Q 24Which secret agent temporarily replaces Perry as Doofenshmirtz's nemesis in 'It's About Time!'?
Peter the Panda
Peter the Panda, an agent from Seattle, takes over as nemesis in 'It's About Time!', leaving both Perry and the doctor moping until a talk-show appearance reunites them.
Q 25What kind of pet is Pinky, Isabella's animal who is also a secret agent?
A chihuahua
A chihuahua, Pinky is Perry's canine counterpart: he answers to Admiral Wanda Acronym and fights Professor Poofenplotz, an obsessive collector of clown hairspray.
Q 26Baljeet moved to the tri-state area from which country?
India
India is Baljeet Tjinder's birthplace; the math whiz moved to the tri-state area and sings the duet 'Frenemies' with bully-turned-friend Buford.
Q 27Linda Flynn-Fletcher was once a one-hit-wonder pop star under what stage name?
Lindana
Her hit was 'I'm Lindana and I Wanna Have Fun', a wink at Cyndi Lauper.
Q 28Lawrence Fletcher, Ferb's dad, is voiced by the creator of which cult musical?
The Rocky Horror Show
The Rocky Horror Show was written by Richard O'Brien, who voices Lawrence; his Rocky Horror co-stars Tim Curry and Barry Bostwick also turned up in guest roles.
Q 29Which song from 'Flop Starz' delighted Disney executives into asking for a song every episode?
Gitchee, Gitchee Goo
Gitchee, Gitchee Goo, performed by Phineas and the Ferb-Tones in 'Flop Starz', went over so well that Disney asked for a song in every episode; the creators often wrote one in under an hour.
Q 30Which made-for-TV film first revealed Perry's secret-agent identity to the boys?
Across the 2nd Dimension
Across the 2nd Dimension, which aired in August 2011 to 7.6 million viewers, is where the boys finally learn Perry is a secret agent; Slash of Guns N' Roses co-wrote 'Kick It Up a Notch' for it.