S04E19Phineas and Ferb season 4 episode 19: Happy Birthday, Isabella
Aired 12 July 201311 minRated TV-G
Where to watch Phineas and Ferb Season 4 in Australia
Phineas and Ferb season 4 is streaming in Australia on Disney+ (subscription, listed for the whole show). You can also buy it on Apple TV from $14.99.
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Availability checked 16 November 2026.
What happens in “Happy Birthday, Isabella”
Phineas and the gang celebrate Isabella's birthday in a big way, but all she really wants is some quiet time with Phineas. Meanwhile, Doofenshmirtz has installed his Bugs Me-Inator onto an evil bug bus and is driving around Danville turning all the things that bug him literally into bugs.
Episode summary: TMDB.
Before you watch
- It is episode 19 of 48 of season 4, so watch episodes 1 to 18 first.
- It runs about 11 minutes.
- Directed by Robert Hughes, written by Kim Roberson, Kaz and Scott D. Peterson.
Phineas and Ferb trailer
The official trailer for the series (no preview of this episode has been published).
Play video: Phineas and Ferb trailer
Cast and crew of this episode
- Director
- Robert Hughes
- Writers
- Kim RobersonKazScott D. Peterson
Credits: TMDB.
More from Phineas and Ferb Season 4
Every episode of Season 4Phineas and Ferb episode guide
Episode names, air dates, runtimes, stills and ratings: TMDB. Air dates are the first broadcast anywhere; where it streams is our daily Australian check.