After years of loving her Malibu Stacy doll, it begins to dawn on Lisa that her favorite toy sets a bad example for little girls. Lisa tracks down Stacy Lovell, the original creator of the Malibu Stacy doll, and together they design and market a positive, pro-girl doll named Lisa Lionheart. The toy is almost a breakout success, but the sneaky corporate henchmen and women behind Malibu Stacy quickly create a new Malibu Stacy that knocks Lisa Lionheart out of commission.