The adventures of two brothers named Phineas Flynn and Ferb Fletcher, who live in the town of Danville and want to occupy their summer vacation.
Their sister is obsessed with their inventions.
Phineas and Ferb have a platypus, named Perry, who is a secret agent.
He fights against Professor Heinz Doofenshmirtz who has an evil plan, also creating inventions in order to take control of the city.
At the end of the episode, the sister tries to show the boys' construction to her mother, saying, "Mom! Phineas and Ferb built…”, but the children's invention often ends up unintentionally hidden, displaced or destroyed by the confrontation between Perry and Doofenshmirtz.
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