"Phineas and Ferb" Thaddeus and Thor/De Plane! De Plane! (TV Episode 2009) Poster

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In "Thaddeus and Thor", Phineas and Ferb compete with two visiting brothers to build the best treehouse. In "De Plane! De Plane!", the stepbrothers set out to build a plane like what Howard Hughes had built, using papier-mâché.

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