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* AdvertisedExtra: Isabella doesn’t have much of a role in the special, having only two lines throughout the show.
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* PlantMooks: What everyone except for Phineas, Ferb, Milo, Doofenshmirtz, and Orten are turned into.
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/phineas_and_ferb_effect.jpg]]
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* GoThroughMe: Cavendish tries this to protect Dakota from the Pistachions after finding out about the Island of Lost Dakotas.
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* CallBack: Doof's TimeTravel technology uses elements from [[WesternAnimation/PhineasAndFerb Xavier Onassis']] TimeMachine.
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* {{Foreshadowing}}: While at the Island of the Lost Dakotas, Doof accidentally spills Wyatt Burp orange soda on a plant and it dies.
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* StrangeMindsThinkAlike: Doof wants the Wyatt Burp orange soda in spite of knowing it's harmful to the environment because, as he says, he's "not the environment". When the Lost Dakotas are revealed as makers of that soda, one of them says the same thing.
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* RetroactivePreparation: As things look dire for our heroes, Orton remarks that it'll be great for his memoirs. This gives Present Foofenshmirtz an idea, and Future Doofenshmirtz suddenly shows up, now assuming the name Professor Time, explaining how he remembered that he should go back because he read Orton's memoirs. He then invites Orton to go back to 1955 and defeat Derek before he could start his evil plan. They also take along the letter from Milo to deliver to a week in the past.
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* RetroactivePreparation: As things look dire for our heroes, Orton remarks that it'll be great for his memoirs. This gives Present Foofenshmirtz Doofenshmirtz an idea, and Future Doofenshmirtz suddenly shows up, now assuming the name Professor Time, explaining how he remembered that he should go back because he read Orton's memoirs. He then invites Orton to go back to 1955 and defeat Derek before he could start his evil plan. They also take along the letter from Milo to deliver to a week in the past.
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* InternalReveal: Cavendish learns about the Island of Lost Dakotas.
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* DeusExMachina: As things look dire for our heroes, Future Doofenshmirtz suddenly shows up, now assuming the name Professor Time, explaining how he remembered that he should go back because he read Orton's memoirs. He invites Orton to go back to 1955 and defeat Derek before he could start his evil plan.
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* RetroactivePreparation: As things look dire for our heroes, Orton remarks that it'll be great for his memoirs. This gives Present Foofenshmirtz an idea, and Future Doofenshmirtz suddenly shows up, now assuming the name Professor Time, explaining how he remembered that he should go back because he read Orton's memoirs. He then invites Orton to go back to 1955 and defeat Derek before he could start his evil plan. They also take along the letter from Milo to deliver to a week in the past.
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** Subverted with Doofenshmirtz Evil Inc. Despite being fine in "Act Your Age", the building got leveled completely at the very end, and Doof ends up crashing at Milo's house.
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** Subverted with Doofenshmirtz Evil Inc. Despite being fine in "Act Your Age", the building got leveled completely at the very end, and Doof ends up crashing at Milo's house. Although it is likely the building will get rebuilt.
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* DramaticGunCock: Parodied with Diogee, who cocks his leg in this fashion.
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** Subverted with Doofenshmirtz Evil Inc. Despite being fine in "Act Your Age", the building got leveled completely at the very end, and Doof ends up crashing at Milo's house.
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* MobileKiosk: Doof's first Time Travel-Inator is shaped after a taco stand... with the stand itself shaped after a taco.
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* {{Faceship}}: The Murphy's Law Suit that Phineas and Berb build is modeled after the likeness of Milo.
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* {{Faceship}}: The Murphy's Law Suit that Phineas and Berb Ferb build is modeled after the likeness of Milo.
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* {{Faceship}}: The Murphy's Law Suit that Phineas and Berb build is modeled after the likeness of Milo.
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* PreviouslyOn: Like "Fungus Among Us", "The Phineas and Ferb Effect" has this as a ColdOpen. This time, it's combined witn LetMeGetThisStraight, as Doofenshmirtz recaps the events that were likely being told to him before, and asks them that what Milo and co were saying is... [[SkewedPriorities that they're NOT the pizza delivery guy]].
to:
* PreviouslyOn: Like "Fungus Among Us", "The Phineas and Ferb Effect" has this as a ColdOpen. This time, it's combined witn with LetMeGetThisStraight, as Doofenshmirtz recaps the events that were likely being told to him before, and asks them that what Milo and co were saying is... [[SkewedPriorities that they're NOT the pizza delivery guy]].
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* TheCavalry: As things look bleak for Milo, Phineas and Ferb, who got captured by the Pistachions and are about to get M.U.L.C.H.'ed, Doofenshmirtz, Perry, Dakota, Cavendish, Orton and [[Recap/MiloMurphysLawS1E33IslandOfTheLostDakotas all the lost Dakota paradoxes]] fly in, armed with Wyatt Burp soda. Isabella and the Fireside Girls also show up to free Phineas, Ferb and Milo.
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* TheCavalry: As things look bleak for Milo, Phineas and Ferb, who got captured by the Pistachions and are about to get M.U.L.C.H.'ed, Doofenshmirtz, Perry, Dakota, Cavendish, Orton and [[Recap/MiloMurphysLawS1E33IslandOfTheLostDakotas [[Recap/MiloMurphysLawS1E33TheIslandOfLostDakotas all the lost Dakota paradoxes]] fly in, armed with Wyatt Burp soda. Isabella and the Fireside Girls also show up to free Phineas, Ferb and Milo.
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* TheCavalry: As things look bleak for Milo, Phineas and Ferb, who got captured by the Pistachions and are about to get M.U.L.C.H.'ed, Doofenshmirtz, Perry, Dakota, Cavendish, Orton and [[Recap/MiloMurphysLawS1E33IslandOfTheLostDakotas all the lost Dakota paradoxes]] fly in, armed with Wyatt Burp soda. Isabella and the Fireside Girls also show up to free Phineas, Ferb and Milo.
* ChekhovsGun: The Wyatt Burp orange soda. Introduced as a discontinued soda drink because it harmed the environment, it's used against the Pistachions in the FinalBattle.
* ChekhovsGun: The Wyatt Burp orange soda. Introduced as a discontinued soda drink because it harmed the environment, it's used against the Pistachions in the FinalBattle.
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* ToxicInc: The Wyatt Burp company got closed down in the 70s because its orange soda was harmful to the environment. This doesn't include humans, but it DOES include Pistachions.
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* ToxicInc: The Wyatt Burp company got closed down in the 70s because its orange soda was harmful to the environment. This doesn't include humans, but it DOES include Pistachions.Pistachions.
* WindsOfDestinyChange: Phineas and Ferb manage to weaponize Murphy's Law with the aptly named Murphy's Law Suit, naturally manned by them and Milo as the power sources.
* WindsOfDestinyChange: Phineas and Ferb manage to weaponize Murphy's Law with the aptly named Murphy's Law Suit, naturally manned by them and Milo as the power sources.
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** Baljeet happens to be one of the Lumberzacks, carrying their well-known single with him. When Buford in turn mentions the Pistachion guards were singing the tune as well, it gives Melissa [[WeNeedADistraction an idea]].
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** Baljeet happens to be one a fan of the Lumberzacks, carrying their well-known single with him. When Buford in turn mentions the Pistachion guards were singing the tune as well, it gives Melissa [[WeNeedADistraction an idea]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed [[FunWithAcronyms in its acronym]]: '''M'''achine '''U'''sed for '''L'''iterally '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. [[StatusQuoIsGod They are of course]] [[SavedByCanon turned back to normal]] [[ResetButtonEnding when Orton and Professor Time managed to slay Derek in 1955...]] [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed [[FunWithAcronyms in its acronym]]: '''M'''achine '''U'''sed for '''L'''iterally '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends friends, [[MyFriendsAndZoidberg and the Giant Floating Baby Head]], converted and [[FaceHeelTurn turned to his side]]. [[StatusQuoIsGod They are of course]] [[SavedByCanon turned back to normal]] [[ResetButtonEnding when Orton and Professor Time managed to slay Derek in 1955...]] [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
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** Baljeet happens to be one of the Lumberzacks, carrying their well-known single with him. When Buford in turn mentions the Pistachion guards were singing the tune as well, it gives Melissa [[WeNeedADistraction an idea]].
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* PreviouslyOn: Like "Fungus Among Us", "The Phineas and Ferb Effect" has this as a ColdOpen. This time, it's combined witn LetMeGetThisStraight, as Doofenshmirtz recaps the events that were likely being told to him before, and asks them that what Milo and co were saying is... [[SkewedPriorities that they're NOT the pizza delivery guy]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. [[StatusQuoIsGod They are of course]] [[SavedByCanon turned back to normal]] [[ResetButtonEnding when Orton and Professor Time managed to slay Derek in 1955...]] [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
to:
* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed [[FunWithAcronyms in its acronym: acronym]]: '''M'''achine '''U'''sed for '''L'''iterally '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. [[StatusQuoIsGod They are of course]] [[SavedByCanon turned back to normal]] [[ResetButtonEnding when Orton and Professor Time managed to slay Derek in 1955...]] [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. They are of course turned back to normal when Orton and Professor Time managed to slay Derek in 1955... [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
to:
* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. [[StatusQuoIsGod They are of course course]] [[SavedByCanon turned back to normal normal]] [[ResetButtonEnding when Orton and Professor Time managed to slay Derek in 1955... 1955...]] [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
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* SavedByCanon: Since this is set before "Act Your Age", the ''Phineas & Ferb'' characters will be fine. And not remain as Pistachions.
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. They are of course turned back to normal when Orton and Professor Time managed to slay Derek in 1955... [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
to:
* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''C'''onverting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. They are of course turned back to normal when Orton and Professor Time managed to slay Derek in 1955... [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].
to:
* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]]. They are of course turned back to normal when Orton and Professor Time managed to slay Derek in 1955... [[ButtMonkey except for Bradley]], whose right arm is still a [[CombatTentacles branchy tendril]].
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* DeusExMachina: As things look dire for our heroes, Future Doofenshmirtz suddenly shows up, now assuming the name Professor Time, explaining how he remembered that he should go back because he read Orton's memoirs. He invites Orton to go back to 1955 and defeat Derek before he could start his evil plan.
* FanBoy: Cavendish is a big fan of Professor Time: his outfit is a green version of Time's outfit and he wears Professor Time-themed underpants, which he almost wanted to show to Doofenshmirtz. Cavendish even [[{{Squee}} Squees]] when Future Doof, now assuming the Professor Time name, shows up.
* MyGodWhatHaveIDone: During the final act, Derek sends in the giant Pistachion from "Fungus Among Us" to attack Zack, Melissa, Orton, Dakota and Cavendish. However, upon viewing all the carnage and tragedy on the battlefield, the giant Pistachion realizes he's doing more harm than good, and [[ScrewThisImOuttaHere decides to leave]].
* FanBoy: Cavendish is a big fan of Professor Time: his outfit is a green version of Time's outfit and he wears Professor Time-themed underpants, which he almost wanted to show to Doofenshmirtz. Cavendish even [[{{Squee}} Squees]] when Future Doof, now assuming the Professor Time name, shows up.
* MyGodWhatHaveIDone: During the final act, Derek sends in the giant Pistachion from "Fungus Among Us" to attack Zack, Melissa, Orton, Dakota and Cavendish. However, upon viewing all the carnage and tragedy on the battlefield, the giant Pistachion realizes he's doing more harm than good, and [[ScrewThisImOuttaHere decides to leave]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions, as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants]]. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions, Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants]].Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].
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* BornLucky: The titular "Phineas and Ferb Effect" is actually the source of all of the [[ContrivedCoincidence beneficial coincidences]] of their show - It's the opposite of Murphy's Law. Just as Milo's presence makes things go wrong, Phineas or Ferb's presence makes things go right. Baljeet even figures out how to use this to weaponize Murphy's Law.
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions, as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].]]
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* BalefulPolymorph: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions, as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants.Plants]]. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].]]
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Moved to Trivia.
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* ScrewedByTheNetwork: This crossover episode was supposed to air in North America in 2018, but got pushed back to 2019, while Japan aied it just when that was announced, and Germany and the UK will get it in September alongside other Season 2 episodes.
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No spoiler tags in recap pages.
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* BalefulPolymorph: [[spoiler: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].]]
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* BalefulPolymorph: [[spoiler: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], Pistachions, as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].]]
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* ToxicInc: The Wyatt Burp company got closed down in the 70s because its orange soda was harmful to the environment. This doesn't include humans, [[spoiler: but it DOES include Pistachions]].
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* ToxicInc: The Wyatt Burp company got closed down in the 70s because its orange soda was harmful to the environment. This doesn't include humans, [[spoiler: but it DOES include Pistachions]].Pistachions.
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The crossover special with ''WesternAnimation/PhineasAndFerb''. Continuing where [[Recap/MiloMurphysLawS1E34FungusAmongUs Fungus Among Us]] left off, Milo, Dakota, Cavendish and Orton Mahlson try to convince Dr. Heinz Doofenshmirtz to build a time machine and stop Derek's plans in 1965. Coincidentally, Doofenshmirtz already made a Time Traveler-Inator in order to go to 1965 to get some Wyatt Burp orange soda, which was discontinued in the 70s due to being harmful to the environment. However, Doof still needs time juice in order to make it work, which hasn't been discovered yet. Fortunately, the clock from the time stream Milo was given earlier contains a bit of time juice, so Milo and Diogee go back home with Perry the Platypus to pick it up. After doing so, the Time Traveler-Inator is set, but Pistachions have discovered Doof's home, so Milo decides to distract them so Dakota, Cavendish, Orton, Doof and Perry can travel in time.
Meanwhile, Zack and Melissa manage to escape their prison along with Buford and Baljeet, who had discovered a project called M.U.L.C.H. is being worked on, although they do not know it purpose. The four accidentally run into Derek, who has assumed his role as Orton for years without taking his mask off, and thus got his actual head shaped after Dr. Zone. Derek explains his plan to take over the world after his father, but was terrible at running the Dr. Zone tv show... only to discover Zack, Melissa, Buford and Baljeet already ran off while monologuing. The four get cornered alongside Candace, and were eventually saved by Phineas and Ferb. The group then meets up with Milo and Diogee.
Milo, Melissa, Zack, Phineas, Ferb, Candace, Buford and Baljeet then go to Phineas and Ferb's hideout and try to find a way to fend off the pistachions without Murphy's Law getting in the way, while Cavendish, Dakota, Orton, Perry and Doof try to avert the takeover in the past, but then get stuck on an island in the present. Will they succeed before Derek can unleash his M.U.L.C.H. project?
----
* BalefulPolymorph: [[spoiler: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].]]
* ScrewedByTheNetwork: This crossover episode was supposed to air in North America in 2018, but got pushed back to 2019, while Japan aied it just when that was announced, and Germany and the UK will get it in September alongside other Season 2 episodes.
* ShesNotMyGirlfriend: Buford and Baljeet make constant remarks about Zack and Melissa being a couple, which they deny.
* ToxicInc: The Wyatt Burp company got closed down in the 70s because its orange soda was harmful to the environment. This doesn't include humans, [[spoiler: but it DOES include Pistachions]].
Meanwhile, Zack and Melissa manage to escape their prison along with Buford and Baljeet, who had discovered a project called M.U.L.C.H. is being worked on, although they do not know it purpose. The four accidentally run into Derek, who has assumed his role as Orton for years without taking his mask off, and thus got his actual head shaped after Dr. Zone. Derek explains his plan to take over the world after his father, but was terrible at running the Dr. Zone tv show... only to discover Zack, Melissa, Buford and Baljeet already ran off while monologuing. The four get cornered alongside Candace, and were eventually saved by Phineas and Ferb. The group then meets up with Milo and Diogee.
Milo, Melissa, Zack, Phineas, Ferb, Candace, Buford and Baljeet then go to Phineas and Ferb's hideout and try to find a way to fend off the pistachions without Murphy's Law getting in the way, while Cavendish, Dakota, Orton, Perry and Doof try to avert the takeover in the past, but then get stuck on an island in the present. Will they succeed before Derek can unleash his M.U.L.C.H. project?
----
* BalefulPolymorph: [[spoiler: The purpose of M.U.L.C.H. is to convert humans to [[PlantPerson Pistachions]], as revealed in its acronym: '''M'''achine '''U'''sed for '''L'''iterally '''C'''oncerting '''H'''umans... To Plants. Derek actually [[TheBadGuyWins succeeded]] in getting some of Phineas, Ferb and Milo's friends converted and [[FaceHeelTurn turned to his side]].]]
* ScrewedByTheNetwork: This crossover episode was supposed to air in North America in 2018, but got pushed back to 2019, while Japan aied it just when that was announced, and Germany and the UK will get it in September alongside other Season 2 episodes.
* ShesNotMyGirlfriend: Buford and Baljeet make constant remarks about Zack and Melissa being a couple, which they deny.
* ToxicInc: The Wyatt Burp company got closed down in the 70s because its orange soda was harmful to the environment. This doesn't include humans, [[spoiler: but it DOES include Pistachions]].
