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"Cranius Maximus" is an episode of Phineas and Ferb.


When Baljeet becomes concerned that he is losing his mental edge, the boys invent a cerebral stimulatory hat, or "Brain booster," to help him. But when the hat exceeds expectations and makes Baljeet exponentially smarter, he suddenly views everyone else as beneath him and becomes a threat to civilization by taking Earth's atmosphere and bringing it to the moon. Meanwhile, Dr. Doofenshmirtz plans to use his "Key-Find-Inator" to collect all the keys in Danville in hopes that it will lead to the Key to the City.


Candace notices that the kids are up to something dangerous, even though it's just playing cards. Baljeet comes in, apologizing that he's late. Buford brings up the question of who invented playing cards. Baljeet claims that ancient Babylonians created playing cards, but Ferb corrects him by telling everyone that the Babylonian Society had been defunct for 1000 years before playing cards were introduced in India. Baljeet then realizes in horror that he was wrong, and concludes that due to the 3 months of Summer Vacation, he is losing his edge. After Baljeet walks away, Phineas says he knows what they're going to do.

At the antique shop, Lawrence is showing a customer around, and shows her a wardrobe that Perry is sitting near. After they walk away, Perry dons his fedora and walks into the wardrobe and into his lair, encountering coats, trees, and snow on his way. Major Monogram then explains the trees were left over from Christmas and that the air conditioning was on the fritz. He then informs Perry that keys across the Tri-State Area are disappearing causing chaos.

In the backyard, Baljeet comes back with two CAT Scans of his brain, one before Summer and one during Summer. Isabella points out that they look the same. Baljeet knows this, but says he is slipping, evidenced by the fact he took three minutes to remember how to give himself a CAT Scan. Phineas then shows Baljeet what they made while he was gone; a helmet that stimulates his brain. The helmet visibly works, as Baljeet performs complex equations to solve how many sub-atomic particles are on a dandelion. Meanwhile, Candace asks Stacy if she still wants to go to the pool. Perry then appears at Doofenshmirtz Evil Inc., where Doofenshmirtz traps him in a water soluble capsule. He then reveals his plan; to steal all of the keys in the city with his Key-Find-inator, in hopes of finding the Key to the City, believing it will allow him to go anywhere in the city.

Back at Phineas and Ferb's house, Baljeet is still testing the helmet. He reveals his new intelligence has given him a lot of ideas, with his favorite being taking the Earth's atmosphere and placing it on the moon, so that everyone would have a better view out of a telescope. His friends try to talk him out of it, but he continues anyway. Phineas realizes that the brain booster was not such a good idea after all. Buford tries to shut off the helmet's power source, but Baljeet placed a force field around it so no one would shut it off.

Fooling Baljeet with cardboard effigies, Phineas, Ferb, Buford and Isabella make their way under the backyard to get to the atmospheric device. Using jet-packs, they distract Baljeet by flying around the device. Thinking he has stopped them with his tractor beam, Baljeet commences the atmospheric transfer process. Candace walks out, notices the device, and calls Mom, who is stuck at the post office because she can't find her keys. As the weather grows erratic, the Key to the City ceremony is starting. Just as Roger hands the key to its recipient, the Key-Find-inator zaps it and brings it to him. Due to the rain, Perry is able to escape from the capsule and attack Doofenshmirtz.

Baljeet continues the transfer, as Phineas warns him to surrender. As he realizes that he was fooled by life-sized mannequins, Buford comes and yanks the brain booster off of Baljeet's head, and he returns to normal. Phineas explains that Baljeet was chasing the mannequins while they dug up through the device. Phineas asks if he remembers the mannequins they built earlier. Baljeet says he doesn't. Ferb says "It pays to be on time", prompting Baljeet to get an alarm clock. Realizing his mistake, Baljeet explains that he can't stop the transfer, as he does not remember the controls. Isabella asks if he included a fail-safe. He remembers he did, but he can't find the keys to shut it off.

The Key to the City arrives at Doofenshmirtz's -inator. While he was analyzing how it is more of a decoration, Perry reverses the affect of the -inator, sending all of the keys back where they were and causing it to self-destruct. Doofenshmirtz rants more about the key, then is zapped by lightning. As Linda continues looking for her key, it lands in her hand. As Baljeet is running around frantically trying to find the key before the transfer is complete, it lands on the key hook. One second before the transfer is complete, Baljeet turns the key and stops the process, saving the Earth.

Isabella comments that they should do something about the helmet. Buford interjects; using the helmet, he created the world's largest wedgie machine. And as Candace was about to bring Mom into the backyard, the wedgie machine pulls the atmospheric device into space along with the helmet. Candace complains that the device was there just a second ago, with Linda saying that "It pays to be on time". She asks if anyone wants pie, and all of the kids run in. As Perry walks in, an annoyed and sad Candace says she's "Going to get an alarm clock".




  • Ferb and Baljeet say that playing cards originated in India, but they are both wrong, as playing cards actually originated in China.
  • When Doofenshmirtz catches Perry, his shirt starts out white, but when he is putting his pants on, it turns black.
  • Candace complains that the tower was here just a second ago, but the time between the wedgie machine pulls the tower into space and she says that is actually nine seconds in real time. (though she could've been exaggerating)
  • Baljeet's pocket disappeared and reappeared throughout the episode.
  • In the scene where Baljeet sees the stuffed models of the gang, it's shown Ferb before Isabella but when the camera jumps to the backyard it's the opposite, and their gestures are different.
  • Technically Candace would've busted Buford and Baljeet because Phineas and Ferb didn't build the invention.
  • When Baljeet is trying to stop Phineas and his friends a lever is out of place.
  • When the song begins, at one point Isabella's right bangs are the same color as the sky.
  • In the last shot, Candace's eyes repeatedly change color from black to blue and vice versa.


  • The episode title is an allusion to Circus Maximus, an ancient Roman chariot racing stadium and mass entertainment venue.
  • This episode confirms Isabella is between 9-12 years old due to her saying "I was so looking forward to junior high."


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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