The boys build a biodome to help the Fireside Girls. In "Canderemy", Candace's day with Stacy is complicated when, thanks to Dr. Doofenshmirtz, she is fused together with Jeremy.

Candace uses boots that Phineas and Ferb invent to be in two places at once. / A retiring train conductor inspires Candace to become determinedly lackadaisical.

Phineas and Ferb make a mechanical version of a historical shark then fly to the moon to make some exquisite ice cream.

The boys invent a supercomputer to answer their questions, but Candace has other ideas./ Perry goes missing from his 100th battle with Doofenshmirtz.

Phineas and Ferb make Candace a new cell phone, which sends her to Easter Island. The boys make a flying carpet to please their father.

Candace gives herself a bad haircut. Dr. Doofenshmirtz intends to win a meatloaf contest with a family recipe and a Rotten-inator ray gun.

Phineas and Ferb have become boring, and Perry fears he knows how. Doofenshmirtz stresses from Vanessa walking in on a conversation where he sounded like he'd rather have a son.

Candace injures her ankle and is told to stay in bed. Phineas and Ferb build a traveling truck-stop diner.

The kids build a giant version of their favorite childhood game and have a bike race through town.

Ferb's cousins visit from England and challenge him to a soccer match.

Candace is bitten by a bat. Phineas and the gang wind up in the best haunted house ever. A mad scheme leaves Dr. Doofenshmirtz adversely affected by the full moon.

Phineas and Ferb decide to create their own language - Ferb Latin - and later end up creating a hybrid race while addressing a potato famine caused by Doofenshmirtz.

The boys decide to put on a traditional family Christmas special featuring their family, friends and a few very special guests, including Kelly Clarkson.

It's the stone age and Phinabunk and Gerb decide to invent the wheel. It's 16th century China and Phineas and Ferb set out to rescue kidnapped Princess Isabella from Doofus Khan.

Phineas and Ferbalot set out to quest for the legendary sword, Excaliferb.

Candace tries to recreate a lost gift. She also gets to rule a giant ant colony.

Phineas and Ferb are inspired by an antique escape chamber. Perry becomes Doofenshmirtz' butler, and the boys make a backyard amusement park out of cheese.

Lawrence Fletcher gets hit with Rodney's evil-izer while Candace mistakes Mom's junk sculpture for the work of Fineas and Ferb.

When Mom asks the kids to be quiet, Phineas and Ferb created ninja outfits.

The boys are attacked by an alien robot!

In "Let's Bounce", the boys use an anti-gravity device to suspend trampolines all over town to bounce on. In "Bully Bromance Breakup", Buford breaks up with Baljeet and joins up with Dr. Doofenshmirtz instead.

Mom is out of Doonkelberries for her famous Doonkelberry pie, so the boys set out to find some.

Phineas and Ferb ask Candace what SHE wants to do today, and an intellectually enhanced Baljeet becomes the greatest threat to mankind.

An errant blast from Doofenshmirtz' Babe-inator turns Phineas and Ferb into toddlers with Candace in charge of them. "Raiders of the Lost Ark" is spoofed.

Phineas and Ferb create a Perry that can go anywhere and do everything. / Phineas and Ferb invent a world full of giant leaf piles and gourds.

Phineas and Ferb invent a new game: jet-pack volleyball. / Phineas and Ferb create a flying saucer to help solve the mystery of crop circles.

Vanessa and Major Monogram's son, Monty, have coffee together. For a special Ducky Momo figurine, Candace makes multiple deals through Danville's annual Antique Show and Swap Meet.

Doofenshmirtz turns himself into a platypus to defeat Perry, Norm prepares to destroy Danville, and Candace becomes a puddle.

The Flynn-Fletchers and friends vacation to Africa while Perry aborts the trip to deal with Dr. Doofenshmirtz.

While Evil Carl seeks Agent P's paw-print to unlock the OWCA computer, Dr. Doofenshmirtz teams up with Major Monogram to track Carl and build a Re-Good-inator.

Danville learns that Crikey the Crocodile has gone missing, Candance wants to get her hands on Irving's digital scrapbook, and the boys present alternative TV programs.

Phineas and Ferb discover that a planet is hurtling directly toward Earth. Perry gets stuck in the desert with Dr. Doofenshmirtz.

Norm hosts an odd reality show.

Doofenshmitz puts Danville in a blackout for the sake of pity-appeal. Candace tries to bust the boys for retraining squirrels.