Phineas and Ferb S4E21 backdrop
Phineas and Ferb poster

Phineas and Ferb (2007)

S4E21 One Good Turn

Aug 09, 2013 Season 4 Episode 21 Animation, Comedy, Family, Sci-Fi & Fantasy

Candace and Stacy go head-to-head in the Ultimate Obstacle Course created by Phineas and Ferb. Meanwhile, Doofenshmirtz concocts a scheme to embarrass his brother, the Mayor, as part of his latest evil plan.