
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.

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.

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.