Song: Aren't 你 A Little Young To Build A Rollercoaster? By: a rollercoaster engineer and Phineas Flynn Episode: Rollercoaster: The Musical All rights go to 迪士尼 i don't own this video
Phineas and Ferb build a 树 house and remodel Candace's old one. Later, they get in a 树 House Fight against Candace and Stacy. Meanwhile, Perry tries to stop Dr. Doofenshmirtz from getting revenge on his brother Roger.
