
Phineas Flynn and his stepbrother, Ferb Fletcher, are determined to make every day of their summer vacation fun. They try building a full-scale roller coaster, becoming musicians, building a backyard beach, and traveling back in time to meet dinosaurs. Their family pet, Perry the Platypus, doubles as a secret agent and battles evil. Meanwhile, older sister Candace is tattling on them to Mom and Dad, though she can never seem to catch them in the act.

In this musical, Phineas and Ferb revisit the day they built their gigantic rollercoaster.

The boys invent a pair of boots that make the wearer to be faster; the kids decide to create and race a giant hot air balloon.

Phineas and Ferb build a huge biodome; Candace pays a visit to Jeremy's house.

The boys make a mechanical version of a historical shark; the boys take some cows to the moon.