Premise: 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.
S03, E02 (First Aired: Mar. 11, 2011)
Phineas and Ferb invent a pair of boots that make the wearer extraordinarily fast; the kids decide to create and race a giant hot air balloon.
S03, E01 (First Aired: Mar. 4, 2011)
Phineas and Ferb build a huge biodome; Candace pays a visit to Jeremy's house.