Barbie stars as Kara, a modern-day princess with an everyday life. One day, after being kissed by a magical butterfly, Kara soon discovers she has amazing super powers allowing her to transform into Super Sparkle, her secret, crime-fighting alter ego who flies around the kingdom ready to save the day! But, it's not too long before her jealous cousin catches the butterfly and also transforms - this time into Dark Sparkle, her superhero nemesis. Their rivalry takes to the skies but when they discover the kingdom's true enemy, can they put aside their differences to form one super team?