Phineas and Ferb - Season 4 Episode 19 -
Season 4, Episode 19 - 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.
Please explain the problem in a few words.
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Max 255 characters.