Season 4, Episode 21 One Good Turn

First Aired: August 9, 2013

Candace and Stacy compete in Phineas and Ferb's "Ultimate Obstacle Course"; Doofenshmirtz tries to humiliate his brother, the mayor, by making him accidentally insult another town's mayor.

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  • Premise: Animated adventures of two stepbrothers who build outlandish inventions in their backyard while their pet platypus, Perry, carries out secret spy missions. (more)

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