Season 4, Episode 19 Happy Birthday, Isabella

First Aired: July 12, 2013

Phineas and the gang celebrate Isabella's birthday.

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  • Premiered: August 17, 2007
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  • Premise: Two stepbrothers come up with new inventions and schemes to stay ahead of their punk sister. Meanwhile, their pet platypus plots to take down Dr. Doofenshmirtz. (more)

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