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, E17 (First Aired: Jan. 15, 2012)
Phineas and Ferb are cavemen and invent something useful; Dr. Doofenshmirtz tries to remodel his place; Phineas and Ferb must rescue Princess Isabella.
S03, E07 (First Aired: Jul. 15, 2011)
Candace spends the entire day in the backyard so that she can bust her brothers; Dr. Doofenshmirtz thinks Vanessa overhears him say he would rather have a son to do his evil bidding.