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Our planets are going to collide! You do know what that means?

"When Worlds Collide" is an episode of Phineas and Ferb. It premiered on September 14, 2012.


After discovering that a strange planet is hurtling directly toward Danville, Phineas and Ferb set out to avert a disaster, while Buford looks forward to making contact with its alien race. Meanwhile, Dr. Doofenshmirtz hopes to steal the world's largest ball of twine.


The opening scene takes place at Doofenshmirtz Evil Inc, where Heinz Doofenshmirtz accidentally shoots a giant laser beam into the sky, unknown to the audience what the laser does.

Meanwhile, Candace is talking to the phone with Stacy, until the phone gets cut off because of the laser beam outside, of which she blames Phineas and Ferb for it, and immediately calls Linda. It's then shows the laser beam shooting up into space hitting a planet, and then starts to move to an unpointed direction. Back at the Flynn-Fletcher house, Candace calls her mother to bust Phineas and Ferb, who she thinks is shooting lasers, but Linda reminds Candace about a contract that they both signed called, "The Bust Accord". The Bust Accord states that Candace can only try to bust the boys once a day. Candace then admits that she tried to show her mom a giant ant farm earlier that day, and soon after Linda leaves. Candace realizes that it's 10:07, and decides to stay up and wait until 12:00 to bust her brothers, so that way, it will technically be tomorrow.

Outside, Phineas and Ferb are having a sleepover with all of their friends, so they can see the galaxy from a probe they sent into space some time ago. Buford is very anxious to see space, and he tells the story of his "encounter" with an alien species which he calls a Whalemingo (all explained in a song) and the time he spent with one, which he named Tristan. Meanwhile, Perry is called late at night to go check up on Doofenshmirtz, since Monogram thinks that Doof may have fired his inator for the next day that night, and is dismissed.

Phineas fires up their telescope (which is linked to the probe and to a projector) and they look all around space, including seeing their milkshake bar from "Out to Launch". Then, the telescope focuses on a planet of Whalemingos. Buford spots Tristan, the Whalemingo that he became friends with. Meanwhile, Perry arrives at Doofenshmirtz Evil, Inc., and gets trapped in a Double Dutch Machine (which was not even meant to be a trap). Doofenshmirtz hears Perry come in and explains his evil plan: To steal the world's largest ball of twine for Doofenshmirtz Evil, Inc. by using the Sphere Attract-inator.

Back at the Flynn-Fletcher house, the gang continues watching the planet of Whalemingos. Suddenly, the screen becomes out of focus, unknown to the gang why, they zoom out to where only the planet is shown, and see it growing larger, and soon after, discover that it's not getting bigger, but getting closer to Earth. Baljeet calculates that Earth and planet will collide by midnight.

At Doofenshmirtz Evil, Inc., Perry escapes from the trap, and launches himself at Doofenshmirtz. They tussle, eventually starts up the Double Dutch Machine. They both try to keep up with the jump rope and fight at the same time.

Meanwhile, Phineas has an idea to build a giant spring to bounce the planet back into space. Meanwhile, Doofenshmirtz eventually escapes Double Dutch Machine and turns it off. Perry attacks him, and they tumble backward, hitting the Sphere-attract-inator, causing it to fire. It hits the world's largest ball of twine, drawing it closer. At midnight, Candace eagerly finds her mom and dad, listening to records. She explains to them that it is tomorrow. Linda finally consents and follows Candace. Meanwhile, the planet of Whalemingos hurls down on the spring. The spring compresses, and Buford meets eye-to-eye with Tristan. The largest ball of twine floats by, catching on to the Whalemingo planet and unraveling. The ball eventually gets to Doofenshmirtz Evil, Inc., but by this time it's very tiny.

As the spring starts to uncoil, Buford tosses his lucky tambourine up to Tristan to remember him by. Back at Doofenshmirtz Evil Inc., Doofenshmirtz sees the tiny ball of twine and complains. The Whalemingo planet, to which the thread of the twine is attached to, goes up, causing the little ball of twine to move forward, also causing The Sphere Attract-inator to move with it, and throws Doofenshmirtz off the edge of the building. Perry throws him a jump rope, and Doofenshmirtz hangs on to it. Unfortunately, the machine is started by Perry, which bangs Doofenshmirtz up and down Doofenshmirtz Evil, Inc. As the little ball of twine goes up with the planet, the machine wraps around the giant spring.

The Whalemingo planet goes up into space, pulling along with it: The Sphere-attract-inator, the spring, and the ball of twine. At that moment, Candace tries to bust the boys, but the spring, and everything else is gone. The episode ends with Linda calling the gang in for a midnight snack.



  • Phineas' eyes are pointing in different directions when they built the spring.
  • When the whalemingoes' planet is shot back into space, Buford's hair looks like his 2nd dimension counterpart.
  • The second time Perry and Doofenshmirtz touch the Double Dutch machine accidentally, Doofenshmirtz's panda slippers disappear and he began to Double Dutch barefooted.
  • When the whalemingoes' planet lands on the spring, Isabella is walking up next to Phineas, but when she goes to grab his hand, Ferb is between them, and remains there the rest of the scene (although, this might have been intentional due to Ferb's occasional "unexplainable" moments ("Escape from Phineas Tower")).
  • When Doofenshmirtz first shows the picture of the World's Largest Ball of Twine only the Farmer is in the shot to the left side of the picture. When Doofenshmirtz breaks the blackboard the Farmer and his Wife are in the picture on the right side of it.
  • When Doofenshmirtz is telling Perry the Platypus to back up to stay out of the way of the World's Largest Ball of Twine, a layering error causes Perry's tail to appear to be underneath the Double Dutch machine.
  • The Whalemingo's planet was much too small to support an atmosphere, in fact it would have been considered a large asteroid, & the planet should have been frozen and incinerated multiple times from being sent far away from stars some times, and getting very close, possibly going through stars other times.
  • At the speed that planet was going at, it should have crashed through the spring.
  • Buford believes in aliens, contradicting an early statement in Sci-Fi Pie Fly.
  • At the end of the episode, Phineas is seen running inside with the others. As Perry lands on the deckchair, Phineas is still outside and looks at Perry slightly off model.
  • If The Bust Accord was signed on May 6, that would imply the boys started inventing before Summer, which is wrong if what Candace said in "Phineas and Ferb Christmas Vacation!" is true. (Note: This may not be an error because it is possible that Candace has tried to bust her brothers for things other than their inventions)
  • The whalemingo planet should have been drawn to Doofenshmirtz Evil Incorporated, and not the Flynn-Fletcher House.
  • The word "possession" is misspelled "possesion" in the Bust Accord.


  • Based on Candace's dialogue about failing to reveal the giant ant farm to her mom, this episode takes place right after "Gi-Ants".
  • Candace is only allowed to try and bust the boys once a day.
  • Major Monogram reveals that he wears an exfoliating mask/seaweed wrap at night.
  • Dr. Doofenshmirtz wears Peter the Panda slippers in this episode.
  • It is revealed that Buford has a lucky tambourine.
  • According to the Bust Accord, this episode happened either on or after May 6, although the Bust Accord does not mention what year.


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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
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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

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