Perry disappears so Phineas and Ferb create a mechanical device that can assume any form to find him; Doofenshmirtz duplicates his own head so he will be twice as smart; the guys create a colorful fall world, and Doofenshmirtz mentors a student.
Candace enters an obstacle-course race with her dad, but he's replaced by a robot version of himself; the boys build a replica of Niagara Falls in their backyard; Candace babysits Jeremy's sister; Doofenshmirtz creates a solution that makes things fall apa (more…)
Phineas and Ferb create a computer that can answer any question, so Candace asks it to tell her how to bust her brothers; the guys build a fun house; Perry misses his 100th battle against Doofenshmirtz when Candace takes him to a charity pet wash.
The guys build an ATV that can handle extreme terrains and even buildings; Phineas and Ferb plan to construct the world's tallest building; Doofenshmirtz tries to rotate the moon to its dark side because he believes doing so will cause evil to increase.
The boys transform the family auto into a race car and enter it into competition; Perry tries to stop Doofenshmirtz from deflating every inflatable item in the world; the guys create a tropical beach paradise in their backyard; Doofenshmirtz steals lawn gn (more…)
The boys become cowboys and drive a herd of cattle; Doofenshmirtz plans to release termites that will consume everything made of wood so he can launch an aluminum-siding business; the boys use a snow-cone machine to create a winter paradise during the midd (more…)
The boys visit an Egyptian-themed movie theater and attempt to get a mummy of their own, but they end up capturing Candace, who is wrapped in toilet paper; Doofenshmirtz tries to raise the city's water level so his real estate will become beachfront proper (more…)
Phineas enters a thumb-wrestling competition with a local bully after getting tips from boxing champion Evander Holyfield; Doofenshmirtz creates a hypnotic device to control people's minds so they will be forced to sing to him on his birthday; the boys tak (more…)
Candace and the boys visit their grandparents at a lake house, where the guys try to scare Candace with a fake Bigfoot; the guys engage in a tree-house fight after they remodel their own and one for Candace; Doofenshmirtz goes on a date and attempts to sab (more…)
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