The boys decide to ramp up their local summer block party with supersized attractions.
The kids work to save Mom after she is hit by Doof's inator.
The kids build a giant submarine sandwich submarine while Doof steals food.
Candace tries to bust the boys while taking her driving test, and Doof causes chaos in traffic.
The boys build an endless ice luge to beat the heat while Doof brings oil to a waterpark.
Candace and Doof see the same psychologist, who thinks their experiences may be connected.
The boys build a giant zoetrope that goes on an adventure of its own.
The kids build a massive bookcase that gets attacked by an army of Doof-plants.
The boys bring Perry to the vet for a checkup and build a pet wash while they wait.
Carl tries to help Perry stop Doof while working three other part-time jobs.
The Flynn-Fletchers take a cruise while Doof steals shrunken goods.
Isabella struggles to lead the Fireside Girls on her own while Doof renews his evil business license.
Candace puts Mom in a Candace costume in hopes that she'll finally see the boys' invention.
Stacy takes on an agent role with OWCA to rescue Perry from some evil scientists.
After Doof turns into a Mothman and eats Perry's hat, they pay a visit to the OWCA Haberdasher.
The boys build a space adventure film set to help Baljeet learn to act.
Meap enlists Candace and the kids to help bust his nemesis Mitch, before he can steal a long-lost treasure hidden somewhere on Earth.
The kids and Candace each have a sleepover party on the same night.
The kids build a western town while Agent P is captured by Doofenshmirtz's swamp-dwelling cousin, Bubba Doof.
Buford's Candace suit comes to life and tries to take over the real Candace's life.
Candace ignores her brothers for a day in order to help her Mom with a bust of her own.
Vanessa and Doof travel to Drusselstein while the boys dig for Mom's lost wedding ring.
The kids build a bird mansion for a rare macaw while Doof deals with giant praying mantises.
Doof's dream-project-inator misfires and projects people's dreams for all to see.
Doof becomes the center of his own solar system while Irving tries to impress Phineas and Ferb.
OWCA and LOVEMUFFIN face off in a soccer match while the boys help Buford with his aim
People around Danville turn evil after being hit by Doof's latest inator.
While Buford is sick, Baljeet makes him watch an episode of his favorite show, "Space Adventure!"
Isabella works with Doof to bake a giant pastry to impress foreign emissaries.
Doof gathers energy from people exercising while the kids pilot a boat that surfs concrete.
Candace and Jeremy make a Perry documentary as the kids play an extreme game of croquet.
Vanessa and Monty bring their warring fathers, Doof and Monogram, to a “meet the parents” dinner.
Buford goes on a whimsical adventure with a bread bowl hot tub.
Monogram and Carl inspect Agent P’s many lair entrances while Candace tries to speak to the Mysterious Force.
The kids go on a dungeon crawl while Doof tries a reality dating show.
Candace and the boys are stuck in an elevator next to Doof and Agent P.
The kids are visited by the Master of Fate while Agent P has his OWCA performance review.
Doof's fear of a vending machine apocalypse comes true while the kids have fun skipping rocks; Doof works to save Norm from the machines while the kids save the people of Danville.
An army of Candace Suits terrorizes Danville and it's up to Candace and Beatrice to stop them
Baljeet and Buford get stuck in the space between dimensions.
Watch Phineas and Ferb Season 5, Episode 21: Book Flub online on FlixGems. Candace ignores her brothers for a day in order to help her Mom with a bust of her own.