Phineas and Ferb Crossovers
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Evil Science Inator by The Fan of lemons reviews
Doofenshnirtz is taking some Portal inspiration for his next scheme. What's next?- This is my first Fan fiction enjoy
Crossover - Portal & Phineas and Ferb - Rated: K+ - English - Chapters: 3 - Words: 839 - Reviews: 2 - Updated: 2/19 - Published: 1/21 - GLaDOS, Vanessa
The Agents of the Opera by Harmony Valenka Smith reviews
An old story of an angel, a devil, and a man. Just who is who? In this "Agents" take on the Phantom of the Opera, the mystery's solution shall slowly be revealed. Rated T for intense, dramatic scenes, blood, and mild violence.
Crossover - Phantom of the Opera & Phineas and Ferb - Rated: T - English - Romance/Drama - Chapters: 12 - Words: 17,593 - Reviews: 3 - Favs: 2 - Follows: 2 - Updated: 2/17 - Published: 9/15/2015 - Perry, OC
Doki Doki Phineas & Ferb by IsonicfanI reviews
Everyone is talking about Doki Doki Literature Club. This game is a phenomenon. So much so that it's even the basis for Phineas and Ferbs's big idea of the day and Doof's newest plan.
Crossover - Phineas and Ferb & Doki Doki Literature Club - Rated: K+ - English - Humor - Chapters: 1 - Words: 2,444 - Reviews: 3 - Favs: 4 - Follows: 2 - Published: 2/17 - Phineas, Perry, Monika
The Second Weirdmageddon: Fight for Danville! by QuickestSecret reviews
A Gravity Falls/Phineas and Ferb crossover. Rated T because of dark themes. When Bill somehow breaks free of Stan's mind, what will happen when he joins forces with Dr. Doofenshmirtz? Will Phineas, Ferb, Dipper, Mabel and the rest of them be able to stop them?
Crossover - Phineas and Ferb & Gravity Falls - Rated: T - English - Mystery/Adventure - Chapters: 8 - Words: 11,069 - Reviews: 12 - Favs: 8 - Follows: 10 - Updated: 2/16 - Published: 9/5/2017
James and Chrom and the Super Summer by GravityEmblem reviews
School's out in an alternate universe, and James and his friends (From FE Awakening) are ready to make the most of every minute! (FE:A x PnF Fusion Fic. Currently On: Original Episode.)
Crossover - Fire Emblem & Phineas and Ferb - Rated: K+ - English - Humor/Friendship - Chapters: 15 - Words: 18,247 - Reviews: 2 - Favs: 2 - Follows: 3 - Updated: 2/14 - Published: 10/11/2017 - Avatar/Robin, Gangrel, Aversa, Perry
Phineas and Ferb in Dimmsdale: Odyssey into the Mind of Trixie by ArendAlphaEagle reviews
Trixie keeps having romantic dreams about Timmy, so she enlists Phineas and Ferb to create a device that lets her and her friends travel into her mind. Meanwhile, Timmy challenges Vicky to a competition for the title of Skate Park Queen again, and Doofenshmirtz tours with Perry in town while getting chased by Tad and Chad due to some secret. (Sequel to Crocknapped!)
Crossover - Fairly OddParents & Phineas and Ferb - Rated: K - English - Humor/Adventure - Chapters: 11 - Words: 20,879 - Reviews: 4 - Favs: 1 - Follows: 1 - Updated: 2/11 - Published: 12/2/2017 - Trixie, Chloe, Isabella, Candace
Fallen Down (SummerTale Au) by JasmineEdits43
When the child fell down, he had no idea what he was in for. Ferb, accompanied by Phineas, is going to have to traverse the underground and try to get out... In one shot! He does not have a determination soul, like Phineas. He has a Patience soul. (The light blue one!) With a demon (Phineas) helping him, will he be able to survive? Find out! -Cover not mine-
Crossover - Phineas and Ferb & Undertale - Rated: T - English - Adventure/Friendship - Chapters: 1 - Words: 470 - Published: 2/10
Phineas and Ferb X Tekken by joshuasumter951
When Candace accidentally discovered Nina Williams, who had landed in Danville, a set of crazy things happen! Nina meets Phineas and Ferb—and they're the only ones who can help her return home. But when a climatic war between the Mishima Zaibatsu and G Corp ensues, Phineas, Ferb, and their friends travel to the world of Tekken and get help from Jin Kazama and its roster of fighters
Crossover - Tekken & Phineas and Ferb - Rated: K+ - English - Adventure/Humor - Chapters: 4 - Words: 8,491 - Updated: 2/8 - Published: 6/14/2017
Johnneas & Ferb by The Eds Rock reviews
Johnny, Dukey, Susan & Mary visit Danville. Johnny helps Phineas and Ferb with a project, Susan and Mary help Candace bust the boys & Dukey goes on a mission with Perry.
Crossover - Johnny Test & Phineas and Ferb - Rated: K - English - Adventure/Friendship - Chapters: 2 - Words: 7,090 - Reviews: 32 - Favs: 43 - Follows: 25 - Updated: 1/27 - Published: 6/24/2011 - Johnny T., Dukey, Phineas, Perry - Complete
When a Tree Falls (rewrite) by scuderia tifosi
While out in the woods, Dipper and Ford encounter something strange. Set sometime after DD&MD. Oneshot.
Crossover - Phineas and Ferb & Gravity Falls - Rated: K+ - English - Parody - Chapters: 1 - Words: 143 - Favs: 1 - Published: 1/27
Phineas and Ferb Save the Disneyverse by animaladventures1314 reviews
When Doofenschmirz frees the evil fairy Maleficent from Auradon Prison, it's up to Agent P, his owners Phineas and Ferb and their friends, along with the descendants of the most evil of villains: Carlos (son of Cruella De Vil), Jay (son of Jafar), Evie (daughter of Evil Queen) and Mal (daughter of Maleficent) to stop them and a host of other villains from carrying out an evil plot.
Crossover - Phineas and Ferb & Descendants, 2015 - Rated: K+ - English - Friendship/Fantasy - Chapters: 22 - Words: 49,071 - Reviews: 11 - Favs: 14 - Follows: 14 - Updated: 1/15 - Published: 9/6/2016 - Phineas, Perry, Mal, Maleficent
Easter Sunday by zoepeanut
Doofenshmirtz is at it again, up to no good on another one of his hated holidays. This time, he intends to make sure Danville never gets to truly experience Easter again. When one of his insane plans actually begins to work, he angers a certain Guardian who hates having anyone interfere with his egg hunts.
Crossover - Phineas and Ferb & Rise of the Guardians - Rated: K+ - English - Friendship/Humor - Chapters: 7 - Words: 13,257 - Favs: 4 - Follows: 2 - Updated: 1/12 - Published: 8/14/2017 - Phineas, Dr. Doofenshmirtz, Bunnymund, Jack Frost - Complete
Perry's Hat by ZombieCatTookMyPudding
After watching Perry's amazing hat in action, Cad Bane wants to steal it! Will he have it? Not on Agent P's watch!
Crossover - Phineas and Ferb & Star Wars: The Clone Wars - Rated: K+ - English - Humor/Suspense - Chapters: 2 - Words: 911 - Updated: 1/5 - Published: 12/26/2017 - Perry, Cad Bane - Complete
Civil War by Mitchell Movie Productions reviews
After the 2nd Dimension incident results in collateral damage, A new status quo by OWCA fractures a group of friends, resulting in two camps, one led by Arnold and his desire for the heroes to remain free to defend humanity without government interference, and the other following Phineas' surprising decision to support government oversight and accountability.
Crossover - Hey Arnold & Phineas and Ferb - Rated: T - English - Friendship/Drama - Chapters: 4 - Words: 4,565 - Reviews: 1 - Favs: 2 - Follows: 4 - Updated: 12/29/2017 - Published: 5/17/2016 - Arnold, Phineas
Destruction of the Make-Less-Good-Inator by UnstableUniverses reviews
Frank decides to pose as Santa and deliver homemade gifts that nobody wants, meanwhile Dr. Doofenshmirtz teamed up with the McPoyles to take over all of America. Written for the Unstable Universes Podcast.
Crossover - Phineas and Ferb & It's Always Sunny in Philadelphia - Rated: T - English - Parody/Humor - Chapters: 1 - Words: 1,109 - Reviews: 1 - Published: 12/22/2017 - Phineas, Perry, Dr. Doofenshmirtz, Frank R. - Complete
Charlie Saves Christmas by UnstableUniverses
A lovely Christmas poem featuring Perry the Platypus and Charlie working together to save the Philadelphia area from Dr. Doofenshmirtz. Written for the Unstable Universes Podcast.
Crossover - Phineas and Ferb & It's Always Sunny in Philadelphia - Rated: T - English - Humor/Poetry - Chapters: 1 - Words: 858 - Published: 12/22/2017 - Perry, Dr. Doofenshmirtz, Diandra R., Charlie K. - Complete
Phineas and Ferb: Demigods! by HeroesOfOlympusRules reviews
I found a headcannon and decided to build on it. Phineas and Ferb are demigods and they meet Percy and the gang. Better summary inside.
Crossover - Percy Jackson and the Olympians & Phineas and Ferb - Rated: K+ - English - Friendship/Adventure - Chapters: 2 - Words: 496 - Reviews: 3 - Favs: 1 - Updated: 12/22/2017 - Published: 8/18/2017
A Wizardry World For Young Inventors by TSDaSeal reviews
In this AU...Phineas and Ferb never knew the reason why Candace had to go to England for school, and their parents wouldn't tell them anything. But when the two boys receive their Hogwarts letters, they soon understand why their sister went to England. Both are excited, but did their friends receive letters as well? [ SHIPPING HINTS & INSPIRED/COVER BY TURNINGTIDES' ON DEVIANTART ]
Crossover - Harry Potter & Phineas and Ferb - Rated: K+ - English - Adventure/Friendship - Chapters: 7 - Words: 5,806 - Reviews: 14 - Favs: 12 - Follows: 15 - Updated: 12/3/2017 - Published: 7/28/2017 - Phineas, Ferb
Louds in Danville: Jeux de Pools by ArendAlphaEagle reviews
Lincoln and his sisters prepare for a boring five-day vacation in Danville, but as their new neighbor Isabella's backyard swimming pool is revealed to be stuck under maintenance, they decide to make their own with Phineas and Ferb. Meanwhile, Perry has to cope with the Loud family's pets as he has to stop Doofenshmirtz yet again... from growing grass everywhere.
Crossover - Phineas and Ferb & Loud House - Rated: K - English - Friendship/Humor - Chapters: 12 - Words: 15,283 - Reviews: 34 - Favs: 28 - Follows: 25 - Updated: 12/1/2017 - Published: 12/5/2016 - Isabella, Phineas, Perry, Lincoln L. - Complete
Old Debts, New Problems by Owennumber1fan reviews
After the events of thier crossover special, Phineas & Ferb head back to Tatooine with their new friends, but a secret from Isabella's past leads them to a confrontation with Jabba the Hutt. Meanwhile, Darthenshmirtz hires a familiar bounty hunter to help him deal with Perry.
Crossover - Star Wars & Phineas and Ferb - Rated: K+ - English - Humor/Sci-Fi - Chapters: 3 - Words: 3,686 - Reviews: 4 - Favs: 4 - Follows: 5 - Updated: 11/20/2017 - Published: 9/23/2017 - Jabba the Hutt, Isabella, Phineas, Dr. Doofenshmirtz
Take 2 With Phineas & Ferb: The Krusty The Clown Show by Sideshow Raquaelle
The Phineas & Ferb All Star Talk Show story 1: The Krusty The Clown Show. Krusty the Clown and Sideshow Mel co – star in Take Two With Phineas & Ferb. Join Phineas & Ferb as they interview the Clown and his sidekick and must not forget to get answers to questions posed by Fanfiction readers and writers! Feel free to post your own questions to ask.
Crossover - Simpsons & Phineas and Ferb - Rated: K+ - English - Humor/Friendship - Chapters: 1 - Words: 584 - Published: 11/17/2017 - Sideshow Mel, Krusty, Phineas, Ferb
Mystery in Danville by Star1412 reviews
Doofenshmirt's plan goes wrong, and now there are five new kids in Danville!
Crossover - Detective Conan/Case Closed & Phineas and Ferb - Rated: K - English - Adventure/Humor - Chapters: 9 - Words: 8,412 - Reviews: 45 - Favs: 32 - Follows: 39 - Updated: 11/5/2017 - Published: 9/30/2011
Johnneas & Ferb 2 by The Eds Rock reviews
Phineas, Ferb, Candace & Perry visit Porkbelly. Johnny, Phineas & Ferb collaborate on another project while Susan, Mary & Candace once again try to bust them. Meanwhile, Dukey and Perry team up for another mission and battle Dr. Doofenshmirtz, who has joined forces with Wacko. Sequel to "Johnneas & Ferb".
Crossover - Johnny Test & Phineas and Ferb - Rated: K - English - Adventure/Friendship - Chapters: 11 - Words: 15,483 - Reviews: 12 - Favs: 18 - Follows: 19 - Updated: 10/30/2017 - Published: 5/10/2014 - Johnny T., Wacko, Phineas, Dr. Doofenshmirtz - Complete
Brothers- The Origin of Bill Cipher by TheReturnToTheFalls reviews
Several years after Weirdmageddon, Bill Cipher returns to reek havoc on those meat bags called humans. However, his awakening has brought unwanted attention from a long lost soul, his brother. Will Bill succeed, or will he be defeated by his own past.
Crossover - Phineas and Ferb & Gravity Falls - Rated: T - English - Mystery/Adventure - Chapters: 10 - Words: 14,867 - Reviews: 28 - Favs: 12 - Follows: 22 - Updated: 10/15/2017 - Published: 9/30/2016
Crossover Rumble - Vanessa Doofenshmirtz vs Melissa Chase by chosenone1994 reviews
One day at a martial arts gym in Swamp City, Melissa Chase, a skilled karate girl, witnesses an amazing display of karate by a visiting Vanessa Doofenshmirtz during an open practice session. She requests a private spar with her to determine whose karate abilities are better! Inspired by Orange Ratchet's own battle stories!
Crossover - Phineas and Ferb & Milo Murphy's Law - Rated: K+ - English - Chapters: 1 - Words: 1,300 - Reviews: 1 - Favs: 1 - Follows: 1 - Published: 10/10/2017 - Vanessa, Melissa C. - Complete
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