Each day, two kindhearted suburban stepbrothers on summer vacation embark on some grand new project, which annoys their controlling sister, Candace, who tries to bust them. Meanwhile, their pet platypus plots against evil Dr. Doofenshmirtz. The fourth season of Phineas and Ferb first aired on Disney Channel on December 7, 2012 and December 31, 2012 for Disney XD.