Phineas and Ferb invent, scheme, and stay one step ahead of their bratty sister. Meanwhile, their pet platypus plots against evil Dr. Doofenshmirtz.

Phineas Flynn (Vincent Martella) and Ferb Fletcher's (Thomas Brodie-Sangster's) backyard is the neighborhood hotspot for all of their cool inventions. Meanwhile, their elder sister Candace (Ashley Tisdale) is obsessed with busting her brothers for all the inventions to her mom once and for all. Simultaneously, their secret-agent pet, Perry the Platypus (Dee Bradley Baker) fouls the "evil" schemes and plans of Dr. Heinz Doofenshmirtz (Dan Povenmire).

An animated comedy about two stepbrothers who find inventive things to do on each day of their summer vacation, such as building a roller coaster out of materials you would find in your everyday home like Popsicle sticks, indoor plumbing, et cetera. Unbeknownst to them, their pet, Perry the Platypus (Dee Bradley Baker), leads a double life as a secret agent.