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The boys compete with a pair of visiting brothers who also like to build ambitious projects to see who can construct the best backyard fort; Doofenshmirtz attends a family reunion; the guys build a passenger plane to rival the famous Spruce Goose.
The boys produce a TV game show and Candace appears on it to catch Jeremy's attention; Phineas and Ferb build an elaborate car wash to help the Fireside Girls with a fund-raiser; Doofenshmirtz creates a device that literally makes mountains out of molehill (more…)
The guys believe Perry is lost and try to find him, not knowing he has been reassigned to track a new villain after Doofenshmirtz is downgraded to a low-level threat; the family is shipwrecked on an island where Doofenshmirtz is creating a new business.