Phineas and Ferb Season 4 Episode 31

Phineas and Ferb Season 4 Episode 31 SerialGo Watch Online Streaming — Frustrated by waiting in very long lines at the returns counter, Doofenshmirtz invents a "Back-to-the-Store-inator" to send things back to the store they came from. Meanwhile, Phineas and Ferb organize an extreme beatdown challenge, which their friends participate in, while Candace's obsession with catching her brothers coincides with her and Jeremy's visit to Extreme Water Park.