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. But her jealous cousin also catches the butterfly and transforms into Kara's superhero nemesis, Dark Sparkle. When they discover the kingdom's true enemy, can they put aside their differences to form one super team? Read and find out!
- Princess Kara would rather go on an adventure than perform her royal duties. A headstrong heroine, she gains magical powers which transform her into the superhero Super Sparkle.
- Corinne, Princess Kara's cousin, is jealous of her cousin's royal lifestyle. When she gains magical powers, she finally has her chance to steal the spotlight from her cousin as Dark Sparkle.
- Madison and Makalya are Kara's best friends. These competitive, eccentric twin geniuses provide Princess Kara with all the hi-tech gadgets she needs to be Super Sparkle.
- Baron Von Ravendale is the royal advisor who is secretly concocting a potion so he can gain superpowers and take over the kingdom. When he drinks the potion, he gains superpowers and tries to destroy Windemere.