Snapped: Killer Couples (2013)

S2E4 Attack of the 50 Foot Sister

Title: The Giant Sister Strikes Back Plot: Phineas and Ferb whip up a gradual growth serum to assist Baljeet in nurturing his enormous watermelon. However, Candace seizes the opportunity to use it on herself, hoping to grow taller for her perfect image. Meanwhile, Perry the Platypus is on a mission to thwart Doofenshmirtz, who is concocting his most repulsive scheme yet!