Buford has lost his goldfish, so Phineas and Ferb help him search for it.

Meanwhile, after accidentally saving a kitten, everyone thinks Dr. Doofenshmirtz is now on the side of good, to his annoyance.
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!!Tropes
* AccidentalHero: Happened to Doofenshmirtz when he saved a kitty. He actually tripped with a bump and the kitty casually fell on his shopping bag.
* HeelFaceTurn: Everyone ''thinks'' Dr. D did this. He wants to clear up the misunderstanding.
* InelegantBlubbering: Buford does this while on the search.
* InsistentTerminology: Buford isn't crying over his lost goldfish, he's "sweating from [his] eyes".
* WeWantOurJerkBack: Even ridiculously-tolerant Phineas is annoyed by Buford being a total crybaby.