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"Misperceived Monotreme" is an episode of the animated series Phineas and Ferb.


Perry misses his 100th battle against Dr. Doofenshmirtz when Candace takes him to the Charity Pet Wash with her. Perry's absence goes unnoticed when the zookeeper's typical platypus at the Danville Zoo stops Dr. Doofenshmirtz's plan to zap his brother with his "Least-Likely-inator." Meanwhile, the boys build a fun house Phineas and Ferb style.


Phineas and Ferb are watching the news. The Danville zoo has a special about their latest new animal, a platypus that likes eating sandwiches. After debating whether "platypus" is a word, the interviewers decide to go see some other animals in the zoo. When they aren't looking, the platypus escapes into a delivery truck, as it smelled a sandwich that was left in there. Meanwhile, Linda calls Candace, telling her to do something instead of waiting for Jeremy to call her. Candace promptly gets a call from Jeremy. He tells her that he will be volunteering at a charity pet wash at the park. Candace shoos Perry out of the room and continues her conversation with Jeremy. He comments that one can tell a lot about a person's personality by the way they treat animals, and tells her that she should bring Perry to the pet wash so they can wash him together. Candace reluctantly accepts.

Phineas suggests to Ferb that they add fun to everything. Ferb bends a piece of paper over his nose, making it look like a house. Phineas is inspired to make their house into a fun house. Perry's watch beeps, but before he can get to his lair as Agent P, Candace picks him up and announces that she's "borrowing" him. At headquarters, Major Monogram wonders where Agent P is. Carl makes himself useful by fixing Perry's hover chair, adding a hidden button so it will go to Doofenshmirtz's lair and come back automatically. He thinks Agent P's lair is kind of cute, since everything is platypus sized, "like kindergarten".

At the backyard, Phineas and Ferb accept their delivery of fun house materials. It happens to be the same delivery people as the ones who just delivered to the zoo. The zoo platypus, who was hiding in the truck, tumbles out with the fun house stuff and lands near the tree in the yard. Major Monogram is beginning to worry about Agent P, and orders Carl to open all the entrances thinking Perry can't get inside to his lair. Carl is eating his extremely stinky peanut butter, banana, and sardine sandwich as he does this, attracting the sandwich-loving platypus through the tree entrance. He lands in Agent P's chair, and Major Monogram, mistaking it for the real Agent P, tells the platypus that today is his 100th battle against Doofenshmitz. They planted hidden cameras all over Doofenshmirtz Evil Incorporated to watch all the action (and enjoy some cheap laughs). They even recorded hours of footage of Doofenshmitz singing in the bathroom. Monogram sends the platypus to his mission in the hover chair.

Candace and Jeremy with Perry.

At the pet wash, Jeremy and Candace try to wash Perry. However, he refuses to go in the bathtub and manages to squirm his way out of Candace's hands, taking refuge behind a tree. Jeremy finds him and hands him back to Candace, though Perry is still squirming. At Doofenshmirtz Evil Incorporated, Doofenshmirtz turns off the news, now broadcasting about the missing platypus in the zoo. The platypus arrives and Doofenshimrtz also mistakes it for the real Perry. He quickly traps it and throws the remote onto the edge of a table. Doofenshmirtz shows him the Least-Likely-inator, which will make a person "do the least likely thing in their nature". He accidentally fires it, hitting Irving as he walks down the street with Isabella. He then does the least likely things that Irving would ever do: say that Phineas and Ferb are losers and flirt with Isabella.

Doofenshmirtz explains why he built the Least-Likely-inator: not only to make his daughter obey him and his father love him, but mainly to humiliate his brother in front of the legislature since it was the least likely thing he would do. Apparently, Doofenshmirtz is hoping that this will cause the legislature to give the Tri-State Area to him, even though that's not how democracy works. The remote that trapped the platypus falls off the table, releasing the platypus. He starts to lick a spilled coffee on the floor. Meanwhile, at the Flynn-Fletcher House, Phineas and Ferb along with their friends are starting to make the house into a fun house. So far, there is a wall slide, a clown room, a cookie room, and a spinning basement.

The platypus is still licking the spilled coffee. Doofenshmirtz believes that he's using a fighting technique called "Singapore Crab", and then thinks that the platypus is playing mind games with him. The platypus sees the sandwich display case, full of sandwiches, and it runs to it and knocks it over to get to the sandwiches, crushing Doofenshmirtz in the process. The sandwiches scatter, landing on Doofenshmirtz's various switches and devices. The platypus looks as though he is about to attack Doofenshmirtz, but simply picks up a sandwich that is near his face. Doofenshmirtz runs toward the platypus, but it picks up another sandwich on top of a lever, deploying a brick wall that Doofenshmirtz runs into. Major Monogram says that this is called the "Marsh Maneuver", which he hasn't seen since 1974. Carl comments that Monogram had a perm back then, and Monogram retorts by telling Carl to stay off the internet.

Candace washes Perry, and Jeremy replies that "Perry's drowning in motherly love". The platypus is still running around eating sandwiches and narrowly escapes being squished on a table by Doofenshmirtz. Doofenshmirtz falls off the table and gets a pitcher of water poured on himself. The platypus eats another sandwich, opening the roof. Candace and Jeremy take Perry home, only to discover everyone exploring the fun house. Jeremy thinks it's cool, while Candace obviously does not. Perry tries to get out, only to get lost inside a hall with never-ending doors. They all land in Candace's room, which has become the cookie room. Candace is obviously aggravated, but she replies that she will come inside after getting the groceries out of the car.

Doofenshmirtz tries to zap the platypus with the Least-Likely-inator, but he throws a sandwich in the hover chair first. The platypus runs toward the sandwich and eats it, activating the automatic button. Doofenshmirtz tries to fire it at him before it's too late, but he turns it around too far, causing a cable on the machine to break and start spraying everywhere. The platypus rides the chair back to Perry's lair. Meanwhile, Candace got hit by the Least-Likely-inator's final stray blast, causing her to clean the whole thing up unwillingly before Linda could see it. The platypus leaves the lair and Perry arrives. Major Monogram and Carl congratulate him for his great work, calling him a star. Perry is confused since he didn't do anything.




  • Along with "Ask a Foolish Question", most of the multiple line closed captions must be read from bottom to top instead of top to bottom.
  • It's unknown why Major Monogram, Carl, and Doofenshmirtz were unable to tell the difference between Perry and the Platypus that escaped from the Zoo. It may be colored that way so the audience can tell if it is a different platypus.
  • When Candace picked Perry up whilst he was using his watch, in the next scene, the watch is gone.
  • In the opening scenes at the house, Perry doesn't have his top hairs, but while Candace is calling Jeremy, he has his top hairs again.
  • This is actually Perry's 118th battle with Doofenshmirtz (according to the list of episodes up to this point). we can also mention here that "Phineas and Ferb Christmas Vacation!" in the future, also "Phineas and Ferb's Quantum Boogaloo", they hadn't fought in "Isabella and the Temple of Sap", and perhaps the events of "Unfair Science Fair Redux (Another Story)" count as the battle of "Unfair Science Fair" (also they didn't even fight in the Redux, they went to the store), they hadn't fought in "Hail Doofania!", "No More Bunny Business", "I Was a Middle-Aged Robot", "Undercover Carl", "Traffic Cam Caper", "Perry Lays An Egg", "Thaddeus and Thor" and "The Monster of Phineas-n-Ferbenstein", also mention that "Phineas and Ferb Get Busted!" and "Wizard of Odd" were dreams, they hadn't fight in and which make a total of: 104 battles.
    • However, creators Dan Povenmire and Jeff "Swampy" Marsh confirmed the episodes don't take place right after the previous.
  • As Doofenshmirtz looked outside, the color of the building was indigo but on the other scene, it is now violet.
  • The mirror in the clip the O.W.C.A recorded was just triangles and a bit of Doofenshmirtz's hand and brush.
  • During the basement spin, the button on Ferb's shirt wasn't outlined.
  • When Major Monogram tells Carl he's in the way the earpiece on Carl's glasses disappears for a moment.
  • When Candace says "Oh, there you are, Perry", Perry's arm with the watch on moves suddenly.
  • Before Phineas and Ferb look at their blueprints for the funhouse, Ferb's shirt button is missing.
  • When the platypus knocks the display case his eyes are focused, looking like Perry's.
  • While Phineas and Ferb are dancing with the Navy with wavy hair, Phineas' shoes turned black instead of blue.

International premieres


  • If one looks carefully when the platypus pushes the sandwich stand, he was on his hind legs like Perry, and his eyes were focused.

The OWCA logo seen for the first time.

  • A part of the O.W.C.A.'s logo can be seen while Monogram and Carl are watching Doofenshmirtz. Also, when Perry lands on the chair in his lair at the end, Monogram mentioned the fight was a hit on the "'OWCA' internet".
  • This is the first time that Phineas and Ferb's big idea is cleaned up by Candace (though it was a result of Doofenshmirtz's inator).
  • When Candace is cleaning up the fun house, the song plays backwards.
  • This episode along with "Ask a Foolish Question" was featured on the Phineas and Ferb the Movie: Across the 2nd Dimension (DVD) bonus disc in Toys R Us, and later on in The Perry Files DVD.
  • When Doofenshmirtz hits the brick wall, Monogram calls it the "Marsh Maneuver". This is a reference to his voice actor, Jeff "Swampy" Marsh.
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Animated Productions: Phineas and FerbVideographyTake Two with Phineas and FerbPhineas and Ferb the Movie: Across the 2nd DimensionPhineas and Ferb the Movie: Candace Against the UniverseChibi Tiny Tales

Video Games: Phineas and FerbPhineas and Ferb Ride AgainDisney Channel All Star PartyPhineas and Ferb: Across the 2nd DimensionAgent P Strikes BackPhineas and Ferb: Quest for Cool StuffWhere's My Perry?Disney Infinity (2.0) (3.0) • Phineas and Ferb: Day of DoofenshmirtzWhere's My Summer?Where's My Valentine?Where's My Holiday?
Albums: Phineas and FerbPhineas and Ferb Holiday FavoritesPhineas and Ferb: Across the 1st and 2nd DimensionsPhineas and Ferb: Star Wars soundtrack
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Disney Parks
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Entertainment: Phineas and Ferb's Rockin' Rollin' Dance Party
Firework: Celebrate the Magic Parade: Move It! Shake It! MousekeDance It! Street Party

Major Characters: Phineas FlynnFerb FletcherCandace FlynnPerryDr. Heinz Doofenshmirtz

Secondary Characters: Linda Flynn-FletcherLawrence FletcherIsabella Garcia-ShapiroBaljeet TjinderBuford Van StommMajor Francis MonogramJeremy JohnsonCarl KarlStacy HiranoGinger HiranoMillyKatieHollyAdyson SweetwaterGretchenVanessa Doofenshmirtz
Recurring characters: Giant Floating Baby HeadDjango BrownColtraneCharlene DoofenshmirtzRoger DoofenshmirtzVivian Garcia-ShapiroIrvingJenny BrownSuzy Johnson Nana Shapiro• • DannyBobbi FabulousShermanMeapMitchNormClyde FlynnBetty Jo FlynnPinkyAlbertPeterKlimpaloonTalking ZebraMonty MonogramHildegard JohnsonReginald FletcherWinifred FletcherAloyse von Roddenstein
Minor Characters: JerryBigfootYetiKhaka Peu PeuThe RegurgitatorBob WebberPrincess BaldegundeMelissaUnnamed Fireside GirlsAgent EBrobotsDrill SergeantBuck BuckersonTiana WebberJack JohnsonMrs. JohnsonWendyEliza FletcherNicoletteMandyThaddeus and ThorMindyAmandaLucy FletcherAdrian FletcherBeppo BrownDr. HiranoAnnabelle JohnsonSaraBrigitte, Josette, and ColletteMishti PatelLiam McCrackenRodrigoMorgGlenda WilkinsDr. GevaarlijkHeinz Doofenshmirtz's motherBlanca DishonProfessor PoofenplotzEliza M. FeyersiedLyla LolliberryBalloony • Corn Colossus • Professor Parenthesis
Guest Characters: Santa ClausKim Possible PinocchioBaby BaboonThor OdinsonSpider-ManHulkIron ManRed SkullNick FuryVenomWhiplashMODOK

Season One: "Rollercoaster" • "Candace Loses Her Head" • "The Fast and the Phineas" • "Lawn Gnome Beach Party of Terror" • "The Magnificent Few" • "S'Winter" • "Are You My Mummy?" • "Flop Starz" • "Raging Bully" • "Lights, Candace, Action!" • "Get That Bigfoot Outta My Face!" • "Tree to Get Ready" • "It's About Time!" • "Jerk De Soleil" • "Toy to the World" • "One Good Scare Ought to Do It!" • "A Hard Day's Knight" • "I, Brobot" • "Mom's Birthday" • "Journey to the Center of Candace" • "Run Away Runway" • "I Scream, You Scream" • "It's a Mud, Mud, Mud, Mud World" • "The Ballad of Badbeard" • "Dude, We're Getting the Band Back Together" • "Ready for the Bettys" • "The Flying Fishmonger" • "Phineas and Ferb Get Busted!" • "Greece Lightning" • "Leave the Busting to Us!" • "Crack That Whip" • "The Best Lazy Day Ever" • "Boyfriend From 27,000 B.C." • "Voyage to the Bottom of Buford" • "Put That Putter Away" • "Does This Duckbill Make Me Look Fat?" • "Traffic Cam Caper" • "Bowl-R-Ama Drama" • "The Monster of Phineas-n-Ferbenstein" • "Oil on Candace" • "Unfair Science Fair" • "Unfair Science Fair Redux (Another Story)" • "Out to Launch" • "Got Game?" • "Comet Kermillian" • "Out of Toon" • "Hail Doofania!"

Season Two: "The Lake Nose Monster" • "Interview With a Platypus" • "Tip of the Day" • "Attack of the 50 Foot Sister" • "Backyard Aquarium" • "Day of the Living Gelatin" • "Elementary My Dear Stacy" • "Don't Even Blink" • "Chez Platypus" • "Perry Lays an Egg" • "Gaming the System" • "The Chronicles of Meap" • "Thaddeus and Thor" • "De Plane! De Plane!" • "Let's Take a Quiz" • "At the Car Wash" • "Oh, There You Are, Perry" • "Swiss Family Phineas" • "Hide and Seek" • "That Sinking Feeling" • "The Baljeatles" • "Vanessassary Roughness" • "No More Bunny Business" • "Spa Day" • "Phineas and Ferb's Quantum Boogaloo" • "Phineas and Ferb Musical Cliptastic Countdown" • "Bubble Boys" • "Isabella and the Temple of Sap" • "Cheer Up Candace" • "Fireside Girl Jamboree" • "The Bully Code" • "Finding Mary McGuffin" • "Picture This" • "Nerdy Dancin'" • "What Do It Do?" • "Atlantis" • "Phineas and Ferb Christmas Vacation!" • "Just Passing Through" • "Candace's Big Day" • "I Was a Middle Aged Robot" • "Suddenly Suzy" • "Undercover Carl" • "Hip Hip Parade" • "Invasion of the Ferb Snatchers" • "Ain't No Kiddie Ride" • "Not Phineas and Ferb" • "Phineas and Ferb-Busters!" • "The Lizard Whisperer" • "Robot Rodeo" • "The Beak" • "She's the Mayor" • "The Lemonade Stand" • "Phineas and Ferb Hawaiian Vacation" • "Summer Belongs to You!" • "Nerds of a Feather" • "Wizard of Odd" • "We Call it Maze" • "Ladies and Gentlemen, Meet Max Modem!" • "The Secret of Success" • "The Doof Side of the Moon" • "Split Personality" • "Brain Drain" • "Rollercoaster: The Musical!" • "Make Play" • "Candace Gets Busted"
Season Three: "The Great Indoors" • "Canderemy" • "Run, Candace, Run" • "Last Train to Bustville" • "Phineas' Birthday Clip-O-Rama!" • "The Belly of the Beast" • "Moon Farm" • "Ask a Foolish Question" • "Misperceived Monotreme" • "Candace Disconnected" • "Magic Carpet Ride" • "Bad Hair Day" • "Meatloaf Surprise" • "Phineas and Ferb Interrupted" • "A Real Boy" • "Mommy Can You Hear Me?" • "Road Trip" • "Tour de Ferb" • "Skiddley Whiffers" • "My Fair Goalie" • "Bullseye!" • "That's the Spirit" • "The Curse of Candace" • "Escape from Phineas Tower" • "Lotsa Latkes" • "Ferb Latin" • "A Phineas and Ferb Family Christmas" • "Tri-Stone Area" • "Doof Dynasty" • "Excaliferb" • "Phineas and Ferb and the Temple of Juatchadoon" • "Monster from the Id" • "Gi-Ants" • "The Remains of the Platypus" • "Mom's in the House" • "Perry the Actorpus" • "Let's Bounce" • "Bully Bromance Break Up" • "Quietest Day Ever" • "Doonkleberry Imperative" • "Meapless in Seattle" • "Delivery of Destiny" • "Buford Confidential" • "The Mom Attractor" • "Cranius Maximus" • "Agent Doof" • "Minor Monogram" • "What a Croc!" • "Sleepwalk Surprise" • "Sci-Fi Pie Fly" • "Sipping with the Enemy" • "Tri-State Treasure: Boot of Secrets" • "Doofapus" • "Norm Unleashed" • "Where's Perry?" • "Ferb TV" • "When Worlds Collide" • "What'd I Miss?" • "Road to Danville" • "This is Your Backstory" • "Blackout!"
Season Four: "For Your Ice Only " • "Happy New Year!" • "Fly On the Wall" • "Bully Bust" • "My Sweet Ride" • "Der Kinderlumper" • "Sidetracked" • "Primal Perry" • "Mind Share" • "Backyard Hodge Podge" • "Bee Day" • "Bee Story" • "Great Balls of Water" • "Where's Pinky?" • "Phineas and Ferb Musical Cliptastic Countdown Hosted by Kelly Osbourne" • "Knot My Problem" • "Just Desserts" • "La Candace-Cabra" • "Happy Birthday, Isabella" • "Love at First Byte" • "One Good Turn" • "Mission Marvel" • "Thanks But No Thanks" • "Troy Story" • "Druselsteinoween" • "Terrifying Tri-State Trilogy of Terror" • "Face Your Fear" • "Cheers for Fears" • "Steampunx" • "Just Our Luck" • "Return Policy" • "Live and Let Drive" • "Phineas and Ferb Save Summer" • "Father's Day" • "Imperfect Storm" • "The Return of the Rogue Rabbit" • "It's No Picnic" • "The Klimpaloon Ultimatum" • "Operation Crumb Cake" • "Mandace" • "Phineas and Ferb: Star Wars" • "Lost in Danville" • "The Inator Method" • "Night of the Living Pharmacists" • "Tales from the Resistance: Back to the 2nd Dimension" • "Doof 101" • "Act Your Age" • "Last Day of Summer" • "O.W.C.A. Files"

Locations at or near Danville: DanvilleSeattleMr. Slushy FranchiseDoofenshmirtz Evil IncorporatedFlynn-Fletcher HouseAtlantisGoogolplex MallOld Abandoned Amusement Park

Other: AfricaEnglandNew York CityBig BenMarsTokyoLondonChinaIndiaCanadaChileHawaii

Today is Gonna Be a Great DaySummer Belongs to YouCity of LoveJump Right InPerry the Platypus ThemePerry Saves ChristmasLet it Snow, Let it Snow, Let it SnowGitchee Gitchee GooWhere Did We Go Wrong?BustedLittle BrothersWhat'cha Doin?Carpe DiemS.I.M.P. (Squirrels In My Pants)I'm MeRollercoasterCouldn't Kick My Way Into Her HeartThe Ballad of KlimpaloonEvil for Extra CreditBackyard BeachHappy New YearGreat to Be a BabyWhat Might Have BeenSerious FunCurtain Call/Time Spent TogetherFollow the SunSilhouettes