Phineas and Ferb - Season 3

During summer vacation, kindhearted suburban stepbrothers Phineas and Ferb fill each day with a grand new invention, scheme, or project. Their controlling sister, Candace, is determined to catch them in the act and get them in trouble, but the boys keep staying one step ahead. Meanwhile, their pet platypus leads a secret life plotting against the evil Dr. Doofenshmirtz.