Stepsister From Planet Weird
Adaptation of Frances Lin Lantz's novel about 14-year-old Megan Larsen and her future stepsister, Ariel. Megan is stunned to discover that her mother's exuberant new fiance and his seemingly perfect daughter are actually aliens who've taken sanctuary on Earth. Neither girl wants to see their parents get remarried, so they join forces to split up their parents. However, as their plot unfolds, they begin to worry that their wish will come true.