Phineas and Ferb - Season 3 (2011)

Phineas Flynn and his resourceful stepbrother, Ferb Fletcher, happily set out to conquer boredom and make every day of their 104-day summer vacation count. Among their fun-filled projects are building a full-scale roller coaster, creating a new season called swinter, becoming overnight pop music sensations, building a backyard beach complete with a surf competition, and traveling back in time to the Jurassic period. Throughout the escapades, they're accompanied by Perry the Platypus, their seemingly mindless family pet who, unbeknownst to all, has a double life as suave secret Agent P, deftly battling the evil Dr. Doofenshmirtz to save the world. Meanwhile, older sister Candace is aghast at her brothers' bold antics and makes it her life's work to tattle on them to Mom and Dad, though somehow she can never seem to catch them red-handed.