Dr. Doofenshmirtz creates a helmet that can control everyone who wields it, and must battle Agent P while picking up Vanessa from a party. Meanwhile, Phineas, Ferb, Isabella, and Baljeet all fall ill and are forced to stay in bed for the day. (Buford also decides to remain in bed, but not because he is sick) and they create a new video game that lets them play as themselves against each other.
Vanessa and Her Gang
Doofenshmirtz and Perry
Phineas, Ferb and their Gang
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"Rollercoaster: The Musical!"