Phineas and Ferb build a 木, ツリー house and remodel Candace's old one. Later, they get in a 木, ツリー House Fight against Candace and Stacy. Meanwhile, Perry tries to stop Dr. Doofenshmirtz from getting revenge on his brother Roger.
Hey, where's Perry?! Perry is sent on a mission to defeat a new villian and live with a new family, which leaves Phineas, Ferb, Candance, and Dr. Doof frantic!
