The fourth season of Phineas and Ferb first aired on Disney Channel on December 7, 2012, and December 31, 2012, on Disney XD. The series centers on stepbrothers Phineas Flynn and Ferb Fletcher trying to make every day of their summer vacation the best ever, while their older sister Candace Flynn tries to bust them. Other main characters include secret agent Perry the Platypus (who is also Phineas and Ferb's pet) and the evil scientist Dr. Heinz Doofenshmirtz. While the fourth season was intended to be the series' last, in January 2023, Disney revived the series and ordered two additional seasons. The fifth season was set to premiere in 2024 but was later announced to be released the following year 2025 instead.