Phineas and Ferb season 5

Phineas and Ferb
Season 5
Promotional poster
No. of episodes	12
Release
Original network	Disney Channel Disney+
Original release	June 5, 2025 (2025-06-05) – present
Season chronology

The fifth season revival of Phineas and Ferb premiered on Disney Channel on June 5, 2025, and was released on Disney+ in the United States the following day. Created by Dan Povenmire and Jeff "Swampy" Marsh, the series focuses on Phineas Flynn and Ferb Fletcher (Vincent Martella and David Errigo Jr.), two stepbrothers on a summer vacation, while their older sister Candace (Ashley Tisdale) attempts to bust them. Meanwhile, the boys' pet, Perry the Platypus (Dee Bradley Baker)—who lives a double life as a secret agent—thwarts the evil scientist Dr. Heinz Doofenshmirtz (Povenmire). The returning supporting cast includes Caroline Rhea as Linda Flynn-Fletcher, Richard O'Brien as Lawrence Fletcher, Alyson Stoner as Isabella Garcia-Shapiro, Bobby Gaylor as Buford Van Stomm, Maulik Pancholy as Baljeet Tjinder, and Marsh as Major Monogram.

Phineas and Ferb originally ended with its fourth season in 2015, with Povenmire and Marsh continuing to do other work until Povenmire signed a deal with Disney Branded Television at the start of 2023 for a fifth and sixth season. Development began in May, with voice recording commencing by September. The writers' room featured both new and returning writers, and notably saw Vanessa Doofenshmirtz's actress Olivia Olson join her father Martin as a writer. The season has received praise for its return to form, entertainment value, cast performances and characters, although some criticised its lack of reinvention.

Premise

"The new season of Phineas and Ferb will follow the inventive stepbrothers as they tackle another 104 days of summer. Candace is more determined than ever to finally bust her little brothers while their pet platypus, Perry, continues to lead a double life as the suave Agent P, whose sole mission is to thwart Dr. Doofenshmirtz from taking over the Tri-State area."

— Disney

Voice cast

• Vincent Martella as Phineas Flynn
• Ashley Tisdale as Candace Flynn
• David Errigo Jr. as Ferb Fletcher
• Caroline Rhea as Linda Flynn-Fletcher
• Richard O'Brien as Lawrence Fletcher
• Dee Bradley Baker as Perry the Platypus
• Alyson Stoner as Isabella Garcia-Shapiro
• Bobby Gaylor as Buford Van Stomm
• Maulik Pancholy as Baljeet Tjinder
• Dan Povenmire as Dr. Heinz Doofenshmirtz
• Jeff "Swampy" Marsh as Major Francis Monogram
• Tyler Alexander Mann as Carl Karl
• Seth Green as Monty Monogram
• Kelly Hu as Stacy Hirano
• Olivia Olson as Vanessa Doofenshmirtz
• Jack McBrayer as Irving Du Bois

Mitchel Musso, who voices Jeremy Johnson in the series' original run, does not reprise his role for this season, with an uncredited actor voicing the character instead. Thomas Brodie-Sangster, who voiced Ferb in the series' original run, is replaced by David Errigo Jr., who previously voiced the character in Milo Murphy's Law and Phineas and Ferb the Movie: Candace Against the Universe. Some announced guest stars include Brendan Hunt, Michael Bublé, Alan Cumming, Lake Bell, John Stamos, Leslie Jones, Anna Faris, Cristo Fernández, Megan Rapinoe, Meghan Trainor, Jonathan Banks, Rhys Darby, and Ruth Negga.

Episodes

See also: List of Phineas and Ferb episodes

No. overall	No. in season	Title	Directed by	Written by	Storyboarded by	Original release date	Prod. code	U.S. viewers (millions)
138	1	"Summer Block Buster" (Part 1)	Amber Tornquist Hollinger	Scott Peterson	Bryan L. Francis & Sang Young Ha	May 26, 2025 (2025-05-26) (sneak peek) June 5, 2025 (2025-06-05) (official)	501	0.24
		"Cloudy with a Chance of Mom" (Part 2)	Chris Ybarra		Dodo Kitcharoen, Ryann Shannon & Kyle Menke	June 5, 2025 (2025-06-05)
On the last day of school, Phineas, Ferb, and their friends set out to make the Start of Summer block party a massive success by building five different inventions, and Candace is once again determined to bust them. Meanwhile, Perry discovers that Doofenshmirtz has returned to his evil ways and plans to use his latest "Vaporize-inator" to vaporize everything he finds annoying. As Perry foils his plot, Doofenshmirtz's inator misfires on Linda, vaporizing her. Phineas, Ferb, Candace, Isabella, Buford, and Baljeet discover Linda has been turned into a cloud. The boys chase after her to ensure she is safe, while Buford and Isabella find the inator to bring to Baljeet so he can reverse its effects. After Perry foils his original plans, Doofenshmirtz tricks Major Monogram into coming up with a new plan to make a storm out of the Linda cloud. Candace eventually manages to emotionally appeal to Linda, returning her home so they can return her to normal. Perry saves the day by fixing the kids' power supply when it fails, and the Flynn-Fletchers takes a photo with the other kids.
139	2	"Submarine Sandwich Submarine"	James Kim	Oscar Lemus & Joshua Pruett	Samir Barrett & Wendy Grieb	June 5, 2025 (2025-06-05)	502	0.24
		"License to Bust"	Amber Tornquist Hollinger	Kim Roberson	Deena Beck & King Pecora
Phineas and Ferb construct a submarine from a submarine sandwich and take it to the bottom of the Mariana Trench with their friends. Candace tags along with them, neglecting her obligation to compete at a sand castle contest as incumbent champion. They end up provoking a giant sea creature and escape from it using an escape pod as bait. Doofenshmirtz's inator, which steals food from across Danville because he is stuck at home waiting for his oven repairman, backfires and drags him through the beach, covering the submarine in the sand and winning Candace the championship. Phineas and Ferb craft climbing gear after seeing a documentary about geckos, and play around about Danville as Candace takes her driving test. Meanwhile, Doofenshmirtz has built a "Red/Green Shift-inator" that changes traffic lights so that he may get home before his frozen groceries sour. Perry stops the resulting chaos in the traffic from causing anyone harm as Candace drives determinedly to bust the boys. Doofenshmirtz crashes into the gecko gear that the boys have discarded, getting rid of it as it sticks to his tumbling car, and Candace passes her test. However, Linda does notice Phineas and Ferb's swapped hair colors as a result of getting hit by the inator, much to Candace's surprise. Guest star: Jonathan Banks as Driving Instructor
140	3	"Dry Another Day"	Chris Ybarra	Sunny Karnan	HyeonJeong Chozon & Nadine Promes García	June 14, 2025 (2025-06-14)	503	N/A
		"Deconstructing Doof"	James Kim	Olivia Olson & Martin Olson	Bryan L. Francis & Sang Young Ha
Phineas and Ferb build a giant circular ice pathway on a hot summer day, riding it on luges across Danville with their friends. Meanwhile, Doofenshmirtz brings a bunch of oil made from Doonkleberries to a water park, drying all the water with his "Dry-Off-inator" and replacing it with the oil. Candace pursues the luge on skis to the water park, and the luge rolls up the slide that Doofenshmirtz is on, going airborne. The skyward luge melts in the sun, and the water rains into the oil, washing it away and returning the park to normal. Candace and Doofenshmirtz have the same therapist, Dr. Mosley Shamai, who connects their stories through Perry's presence in both of their lives. Following this lead, he interviews the Flynn-Fletchers and their friends and visits Doofenshmirtz, who demonstrates a typical day's scheme-foiling events. Shamai connects this with the disappearance of the boys' latest invention and makes a public presentation out of his evidence. As Phineas, Ferb, and their friends dance in a giant disco ball, Perry thwarts Shamai's exposé by using Doofensmhirtz's "Self-Destruct-inator" to destroy the compiled evidence. At the same time, its misfire reflects across several satellites and takes care of the disco ball. Guest star: Brendan Hunt as Dr. Shamai
141	4	"Tropey McTropeface"	Amber Tornquist Hollinger	Scott Peterson	Dodo Kitcharoen & Ryann Shannon	June 14, 2025 (2025-06-14)	504	N/A
		"Biblio-Blast!"	Chris Ybarra	Joshua Pruett	Samir Barrett & Wendy Grieb
The kids play around with a giant zoetrope which Buford christens "Tropey McTropeface". The zoetrope rolls away in the early morning after Doofenshmirtz's "Turn-Over-inator" misfires on it. All the while, the "Mother Mugger", a criminal who steals umbrellas from mothers, is carried away to the cops by the zoetrope after he robs Linda. The zoetrope rolls through town, and Perry quickly thwarts Doofenshmirtz because Candace has to give him a bath at noon, toppling the roof of Doofenshmirtz's building. After its journey and due to the results of an inator misfire, the zoetrope launches into the air and diverts a meteor from striking Danville, ending up crashing and destroying Doofenshmirtz's inator, before finally docking next to a Ferris wheel in the park. Guest star: Michael Bublé as himself Lawrence's bookcase collapses and the kids build a new massive, complex one for him. As a result of being teased for not practicing photosynthesis as a boy in Gimmelshtump, Doofenshmirtz builds a "Face-Plant-inator" to create omnivorous plants with his face on them, but these turn on Doofenshmirtz and face him and Perry. Lawrence returns from trying to find his wrench in the garage to see the bookcase, going to fetch Linda to see it as Candace attempts to psychologically manipulate her to go outside. The inator misfires into the Flynn-Fletcher’s backyard and the kids fight the resulting Doofensmhirtz-plants off as they eat the bookcase down to a normal size until they are destroyed when Perry hits the inator's self-destruct button.
142	5	"A Chip to the Vet"	James Kim	Kim Roberson	Deena Beck & King Pecora	June 21, 2025 (2025-06-21)	505	N/A
		"More Than an Intern"	Amber Tornquist Hollinger	Sunny Karnan	HyeonJeong Chozon & Nadine Promes García
Linda and the boys take Perry to the veterinarian for his checkup, and Perry must avoid being microchipped at all costs. Candace tags along to see Jeremy working at Mister Slushy Dawg. As the appointment line is long, Phineas and Ferb build a pet grooming contraption during the wait. While at Slushy Dawg, Doofenshmirtz spots Perry at the vet and goes to antagonize him. After being mistaken for a temp vet doctor, Doofenshmirtz sees an opportunity to chip Perry as a "freebie" evil plot. As Perry and Doofensmhirtz evade one another through the clinic, Doofenshmirtz is sent through the kids' contraption getting stuck in it, pressurizing it to launch away. The boys decline to have Perry chipped after his appointment. Guest stars: Kelly Dempsey as Receptionist, Mindy Sterling as Veterinarian The kids have a game of rocket-powered lacrosse while sending a ball between Danville and Africa with a giant racquet. Perry is called in late to deal with Doofenshmirtz's latest plot. Carl goes to his series of part-time jobs, where incidentally Doofenshmirtz is pulling off his plot to bother people using live fish; Monogram tells Carl to help Perry sort this out quickly because of his expensive overtime pay. Carl assuages the issues that Doofenshmirtz creates as Perry pursues him across a restaurant, a birthday party, and during a pizza delivery. Perry foils Doofensmhirtz's plot to put a fish in the hands of everyone in Danville; an overload of fish causes the giant racquet to fly away. Carl delivers the pizza to Monogram, who makes his parking at O.W.C.A. free in return for his efforts to help the organization.
143	6	"The Aurora Perry-Alis"	Chris Ybarra	Olivia Olson & Martin Olson	Bryan L. Francis, Derek Lee Thompson & Sang Young Ha	June 21, 2025 (2025-06-21)	506	N/A
		"Lord of the Firesides"	James Kim	Oscar Lemus	Dodo Kitcharoen & Ryann Shannon
The Flynn-Fletchers takes a cruise to see the Tri-state Aurora, but cloud cover threatens to ruin the spectacle; Phineas and Ferb use clown balloons full of helium to lift the ship above them. Meanwhile, Doofensmhirtz brings Vanessa there as his supposed "break from evil"; Doofenshmirtz uses a "travel-size-inator" to shrink and steal various items around the ship, and Perry is sent to stop him; Major Monogram's aunt Olga and his son Monty are also aboard. As Vanessa and Monty begin to reconcile their relationship, Doofensmhirtz and Perry are shrunk and they fight. The inator misfires, shrinking both the balloons to bring the ship down, and the clouds so the Aurora is visible. This thwarts Candace's attempt to bust the boys, and as Doofenshmirtz reverses the shrink effect on himself and Perry, he is arrested for "bringing a pet on board". Isabella leads a Fireside Girls meeting to determine what cupcake flavor to bring for the Annual Fireside Cupcake Jamboree since Ms. Feyersied cannot make it. Perry has to ensure that Doofenshmirtz renews his license to conduct evil business in the proper fashion, and O.W.C.A.’s business license too. The Fireside girls reach an impasse over whether to bring vanilla or red velvet cupcakes, and they descend into chaotic disarray. Doofenshmirtz struggles through an evil assessment, Perry renews O.W.C.A.’s license, and Doofenshmirtz returns home, turning off his accidentally turned on "uncooperate-inator". This stops the girls' violence and they agree with Isabella's compromise.
144	7	"The Candace Suit"	Chris Ybarra	Kim Roberson	Deena Beck & King Pecora	June 28, 2025 (2025-06-28)	507	N/A
		"Agent T (for Teen)"	Amber Tornquist Hollinger	Scott Peterson	Samir Barrett & Wendy Grieb
As Phineas and Ferb take Isabella for a ride on a space-faring giant pogo stick, Candace gets suits of herself made from Buford's collection of life-sized molds, aiming to disguise Linda to confuse the "force" that ruins her busting plans. Doofenshmirtz's "Leftover-Revive-inator" has made his potato salad sentient and hostile, so Perry works to help him stop this. Candace "tests" her hypothesis with Buford. As Stacy and the other kids don Candace suits, Candace cannot find Linda amongst the disguised Candaces. Doofenshmirtz's inator misfires onto a stray Candace suit, and the potato salad monster launches the boys' pogo stick into orbit, ruining her busting plan. The sentient suit has a cliffhanger ending. As Stacy learned of Perry's dual identity secret last summer, Perry shows her an instructional video on how to deal with the knowledge. Candace and Stacy serve food to a symposium of doctors and scientists, which Doofenshmirtz attends and takes a "tag and bag" challenge with Doctor Diminutive. When Perry is captured by the doctors, Stacy gives chase, and with Monogram's cognizance, she uses her particular set of skills to break into L.O.V.E.M.U.F.F.I.N. headquarters and rescues Perry from being executed by hippopotamuses, receiving a fedora from him as a token of his gratitude.
145	8	"The Haberdasher"	James Kim	Joshua Pruett	HyeonJeong Chozon & Nadine Promes García	June 28, 2025 (2025-06-28)	508	N/A
		"Out of Character"	Amber Tornquist Hollinger	Sunny Karnan	Bryan L. Francis & Sang Young Ha
Phineas and Ferb leave Isabella, Baljeet, and Buford to build something cool while they are with Linda; Candace decides to try and bust them. Meanwhile, Doofenshmirtz turns himself into a hideous moth, damaging Perry's hat such that he seeks a haberdasher to fix the microchip inside to avert an O.W.C.A. security breach. The three kids decide to combine their efforts to produce something impressive enough for Phineas and Ferb. Doofenshmirtz breaks into the haberdasher's office, and Perry defeats him by using a teleporting hat to obtain a laser gun from Doofensmhirtz that turns him back to normal. A misfire from the haberdasher turns the kids' invention into a moth that flies away before either Isabella can show Phineas and Candace can show Linda. Guest star: Alan Cumming as The Haberdasher Baljeet is invited to audition for the next Space Adventure film but does not know how to act so the other kids build him an immersive set. Meanwhile, Doofenshmirtz plans to zap his brother Roger with a "Deface-inator" to make his face instantly forgettable. Baljeet struggles getting into character, but the other kids stage an attack from an animatronic slug monster so they could elicit a true performance from Baljeet. The film's director Katherine Marshall reveals that Baljeet was asked to be an extra in the film instead of the lead character Exterra, but sees his performance and decides he is too good to be an extra. Doofenshmirtz's inator hits Roger's new statue, which boosts Roger's reputation when they believe Roger is showing humility. Katherine takes the set, foiling Candace's attempt to bust the boys. Guest star: Lake Bell as Katherine Marshall
146	9	"Meap Me in St. Louis"	James Kim & Chris Ybarra	Jon Colton Barry	Samir Barrett, Wendy Grieb, Dodo Kitcharoen & Derek Lee Thompson	July 5, 2025 (2025-07-05)	509	N/A
Meap believes that Big Mitch has been running fake tours as a front to obtain funds in search of the "Lost Treasure of Zachariah Yore" to fund his criminal empire. When his Alliance does not believe him, he goes rogue and reunites with the Flynn-Fletcher kids and their friends for assistance. The kids create "Stabby barf pain", a combination of all four seasons, to lure Mitch to Earth. Candace and Meap investigate the location of the treasure, tracking it to the Gateway Arch in St. Louis, Missouri. The alien tourists start to trash the city, but the kids are able to wrangle them together through a performance. Candace and Meap get caught infiltrating Mitch's ship and "accidentally" reveal the location of the treasure. As Doofenshmirtz has Perry help him find new ways to act "maniacal", Mitch steals Balloony, so the two follow onto the ship. As Mitch pulls the Arch out of the ground, the Alliance arrives and learns Meap was telling the truth, forcing Mitch to flee; Doofenshmirtz prevents the ship from self-destructing. Mitch steals Meap's ship, but he and Candace trick Mitch into pressing the self-destruction button, and he is captured. The Alliance Commander and Meap reward Candace for her bravery, and they take the boys' Stabby barf pain machine. Guest stars: John Stamos as Meap, Leslie Jones as The Alliance Commander, and David Mitchell as "Big Mitch"
147	10	"No Slumber Party"	Amber Tornquist Hollinger	Kim Roberson	Deena Beck & King Pecora	July 12, 2025 (2025-07-12)	510	TBD
		"The Ballad of Bubba Doof"	Chris Ybarra	Olivia Olson & Martin Olson	HyeonJeong Chozon & Nadine Promes García
Phineas, Ferb, and their friends have a slumber party at the same time Candace is having one with Stacy and Vanessa. Meanwhile, in a bid to one-up his neighbor who spoils all TV shows, Doofenshmirtz plans to watch the finale of the series Acquaintances and spoil it to the entire Tri-State Area with a giant megaphone. The kids hang out in an inflatable dome where the floor is made of popcorn to watch movies, while Stacy and Vanessa attempt to dissuade Candace from busting the boys. Doofenshmirtz's "Awake-inator" fails to keep him awake, and Perry destroys both of his machines. Stacy and Vanessa join the kids in their dome, so Candace forcefully drags her sleeping mother outside to see it. The inator misfires on some birds, who eat the popcorn and pop the dome, causing it to fly away. Phineas and Ferb build a "forced perspective" old west styled town in the backyard to convince Baljeet to like western movies. While Doofenshmirtz is out of town, Major Monogram and Carl get lost while on an excursion in the swamp, so Perry goes after them. Perry gets caught in a trap and taken to the shack of Doofenshmirtz's cousin, Bubba, who intends to eat Perry. Monogram and Carl discover Perry and the three manage to escape Bubba, who crashes into a beaver dam. Baljeet gains a fondness for western movies, and when Linda arrives, the town is revealed to be just a tiny model, which Candace confusingly points out is not how "forced perspective" works.
148	11	"Attack of the Candace Suit"	James Kim	Scott Peterson	Bryan L. Francis & Sang Young Ha	July 19, 2025 (2025-07-19)	511	TBD
		"Book Flub"	Amber Tornquist Hollinger	Kim Roberson	Dodo Kitcharoen & Derek Lee Thompson
The Candace Suit brought to life by Doofenshmirtz's leftover-revive-inator attempts to eat Jeremy, who runs for shelter at the Flynn-Fletchers' house. The Candace Suit eats Doofenshmirtz and tries to pass herself off as the real Candace before she slips on a banana peel and spits him out. The kids give chase to the Candace Suit, which fights the real Candace, swallows her, and successfully passes herself off as real for a day until Jeremy becomes suspicious and has Phineas and Ferb use their banana peeler to free the real Candace. Buford translates the Candace Suit's garbled speech that she had been feeling lonely ever since being brought to life. To make sure the Candace Suit is with somebody while also keeping humanity safe, the kids bring her to the Himalayas to live with Klimpaloon. Linda suspects that Samantha Sweetwater - a friend from her book club and mother of Fireside Girl Adyson - does not actually read the books. Linda and Candace discover that the club's latest book has been made into a movie and decide to bust Samantha. They infiltrate the Sweetwaters' backyard while Samantha is driving Adyson, recruiting their neighbor Irving. They see that the book has barely been touched but are unable to get closer when the Sweetwaters return early, so they go to the movie theater to catch Samantha. However, they discover that the entire book club could not finish the book and is at the theater to watch together. Samantha admits to Irving that she never reads the books. In the background, Linda constantly sees a giant tube man without realizing her sons built it, and Perry stops Doofenshmirtz from covering the entire Tri-State Area in guacamole. Guest star: Anna Faris as Samantha Sweetwater
149	12	"The Bad Old Days"	Chris Ybarra	Oscar Lemus & Olivia Olson	Samir Barrett, Wendy Grieb & Deena Beck	July 26, 2025 (2025-07-26)	512	TBD
		"Mantis Fact!"	James Kim	Sunny Karnan	Deena Beck & King Pecora
Doofenshmirtz takes Vanessa to Drusselstein to take her citizenship test, which he also decides to take since he was never able to finish his as a teenager. When they arrive, Doofenshmirtz is surprised to see how modernized the town has become, and how significantly easier and less humiliating the citizenship test is, disappointing him as he believes seeing the depressive state of the town he grew up in would give Vanessa her own "tragic backstory". He retools his original Inator into one that begins reverting the town back to its more primitive self, until Perry stops him. He ultimately decides to do what his parents never did for him and be there for Vanessa, and the two receive their citizenships. Meanwhile, Linda loses her wedding ring in the sink pipes, which fall deep below the house, so Phineas and the gang build a massive drill to head underground looking for it. Candace falls into the hole (briefly passing through Perry's lair unknowingly), is chased by mole people wanting her to be their Queen, and reunites with the kids. They find the ring and are blasted out of the underground by a flood of water thanks to Doof's inator. Phineas and the gang create a giant birdhouse on top of their tree in order to attract the Mockmacaw, a bird with the capability to shapeshift into anything and anyone, hoping to get a picture of it. Meanwhile, Perry discovers Doofenshmirtz’s lab has been taken over by giant mantises; thanks to a book on Mantis Facts given to him by Vanessa, Doofenshmirtz was inspired to use an Inator to make them bigger to deal with other bugs, only to make them too big. Doofenshmirtz is suddenly proposed to by one of the mantises, which he accepts and orders them to capture Perry. Perry soon informs Doofenshmirtz that mantis women eat their husbands, which they plan to do to him, forcing them to flee again. At the same time, Phineas and the gang manage to attract the Mockmacaws, but are unable to get a picture of their bird forms. In the city, Perry gives Doofenshmirtz a battery to power his Inator, allowing him to shrink the mantises back to bug size. However, one of the rogue blasts hits him, shrinking him to their size. Candace eventually notices the birdhouse and tries to get Linda to see it, only for it to shrink thanks to another rogue blast. Doofenshmirtz tries to grow himself back with the Inator, but accidentally shrinks himself even smaller than the mantises, and is surrounded by them. Later, Candace starts to freak out seeing Linda and the kids as Mockmacaws, and even herself starting to become one.
150	13	"The Nightmare-Inator"	Amber Tornquist Hollinger	Scott Peterson & Joshua Pruett	HyeonJeong Chozon & Nadine Promes García	August 2, 2025 (2025-08-02)	TBA	TBD
		"Doof in Retrograde"	Chris Ybarra	Joshua Pruett	Bryan L. Francis, Sang Young Ha & Deena Beck

Production

Background and development

Series creators Dan Povenmire (left) and Jeff "Swampy" Marsh (right) returned for the fifth season.

Phineas and Ferb was renewed for a fourth season in August 2011. Originally set to be the final season, it concluded with an hour-long finale, "Last Day of Summer", on June 12, 2015. Povenmire and Marsh remained with the network and together created the series Milo Murphy's Law (2016–2019), after which Povenmire solely created the series Hamster & Gretel (2022–present). In April 2019, Disney announced a one-off film, Phineas and Ferb the Movie: Candace Against the Universe, and that it would be released on its then-new streaming service Disney+; the film premiered on August 28, 2020. On January 13, 2023, it was announced that a deal between Povenmire and Disney Branded Television would renew Hamster & Gretel for a second season, and revive Phineas and Ferb for two new seasons with 20 episodes each. In March 2023, it was revealed that co-creator Jeff "Swampy" Marsh would also return as executive producer and voice director for the revival.

Writing

In the writers' room, returning writer Martin Olson (left) was joined by his daughter Olivia (right) as a writing team.

Development on the fifth season of Phineas and Ferb began in May 2023, at which point Povenmire confirmed the then-ongoing Writers Guild of America strike would not affect its production. Povenmire and Marsh admitted their concerns that they would have trouble coming up with new ideas for the revival, but explained those concerns were alleviated due to their confidence in the writers' room, which contained both returning and new writers. They cited seven episodes in particular as standouts which they felt would appeal most to the returning audience. Vanessa Doofenshmirtz voice actress Olivia Olson joined the writers' room this season, after shadowing under her father Martin Olson—who wrote for the original run—as a writing team with him.

From this season onward, the show is script-driven rather than board-driven.

Animation

Having previously worked on Candace Against the Universe and Hamster & Gretel, Filipino animation studio Snipple Animation Studios animates the season in 2D using the software package Toon Boom Harmony.

Recording

Voice recording began by September 2023, and was not affected by the then-ongoing 2023 SAG-AFTRA strike. Candace Flynn actress Ashley Tisdale was concurrently pregnant during voice recording and refused to record new screams, feeling it would "scare the baby"; she suggested the producers use any of her "17 years" worth of archive audio instead.

The opening credits theme has undergone slight changes for the new season; the first line was changed to "There's another 104 days of summer vacation" (for episodes 2 to 6 only), and Phineas Flynn actor Vincent Martella re-recorded his lines for consistency with how Phineas sounds temporally.

Release

Broadcast and streaming

The fifth season premiered in summer 2025, with the first two episodes airing on June 5 on Disney Channel, and the first ten episodes streaming on Disney+ starting June 6 in the United States and select international markets. A sneak peek of the new season premiered on May 26, 2025. A sneak peek of the first episode was released on May 21.

Promotion

In April 2023, a press release commemorating the 40th anniversary of Disney Channel confirmed that the revival will air on the network. The revival was originally scheduled to be released in 2024. At Disney Television Animation's presentation during the Annecy International Animation Film Festival in June 2024, Povenmire and Marsh made an appearance to promote the series and give details on the production. They specified the revival was being treated as "Phineas and Ferb season 5", and that it would take place in the following year after the events of the season 4 finale, "Last Day of Summer", during a new summer vacation. The duo also previewed a musical animatic which introduces the first episode.

Reception

On Rotten Tomatoes, 100% of 8 critics gave the season a positive review. Rolling Stone's Alan Sepinwall declared his relief at the return of something as "funny, optimistic, joyous, and inventive" as Phineas and Ferb". Collider's Aidan Kelley wrote the season retained the same "vibrant animation, well-written characters, and infectious sense of humor", and remarked it didn't need to differentiate itself from past seasons in order to "spread its infectious positivity"; The Seattle Times's Chase Hutchinson wrote it was "plenty silly, with knowing gags galore and plenty of ridiculous musical numbers", without losing its ability to derive enjoyment from a solid forumula. ComicsBeat's Tim Rooney wrote that Phineas and Ferb "reclaim[s] its throne as the most fun family friendly entertainment on TV".

Screen Rant's Abigail Stevens and Collider's Kelley both felt the first two episodes were only just adequate enough as a premiere, describing them as "just big enough" to serve as a return so that the series could get on with its formula, and "just a little too safe"; Rolling Stone's Sepinwall noted the series addressed the "high bar" the earlier episodes set for itself by having Doofenshmirtz admit he was "starting slow" with his -inators and the titular duo insisting they could top themselves this time around; and The Seattle Times's Hutchinson wrote that the season "settles back into comfortable comedic rhythms", while "playfully" acknowledging it has a "lot to live up to". ComicsBeat's Rooney felt the first half of the premiere was a show of confidence while the second was a bold display of emotion and drama reflective of the collective confidence of the series's staff. Collider's Kelley and Rolling Stone's Sepinwall both noted the 2015 ending of the series's story as the characters embarked to college, and agreed the series needed to be innovative to justify its existence in the time between then.

Stevens felt Doofenshmirtz's return to evil was the worst character regression, ComicsBeat's Rooney recognized the writing's self-reflexive-ness in returning the villain to his hero, Perry, while Collider's Kelley hailed him as the standout, praising what they guessed was "stellar improvisational humor" from Povenmire and opining his dynamic with Perry was the best amongst the series's dynamics. Rolling Stone's Sepinwall compared the focus on the series's supporting characters to that of the fourth season, and pointed out episodes that expanded upon previously established plot points, such as Stacy's knowledge of Perry being a secret agent and Buford having life-size molds of the main cast; ComicsBeat's Rooney praised the cast for "effortlessly" returning to their roles, singling out Martella for sounding the same in his 30s as he did during the original run.

Stevens noted the signs of Phineas, Ferb, and Candace growing up despite the "debatable" idea of the series having character development during its floating timeline. She further opined the subsequent episodes were slightly inferior in quality to the original run, nonetheless praising the inventions, and the "snappy" and "dynamic" musical numbers. Rolling Stone's Sepinwall admitted he saw nothing save one exception in the five episode sampler he watched that he felt could stand up to the original run's best, but lauded the series's ability to return after so long and still feel like itself as a "remarkable achievement". The Seattle Times's Hutchinson wrote despite it not breaking much new ground, it still was "breath of fresh air" and its message of creativity was an amiable effort towards young people. Stevens praised the lessons about family, friendship, and creativity amongst the "small bits of growth very subtly laid out" she could see the makings of.