The third season of Phineas and Ferb first aired on Disney Channel on March 4, 2011, and on Disney XD on March 5, 2011. The season features two step-brothers on summer vacation trying to make every day the best day ever, while their sister tries to bust them. The five main characters are: brothers Phineas Flynn and Ferb Fletcher, secret agent Perry the Platypus, the evil scientist Dr. Heinz Doofenshmirtz, and the brothers' older sister Candace Flynn.
Recurring characters are across-the-street neighbor Isabella Garcia-Shapiro, the boys' mother and father Linda Flynn-Fletcher and Lawrence Fletcher, Major Monogram, Carl the Intern, Jeremy Johnson, Baljeet, Buford Van Stomm, Stacy Hirano, and more.
