Princess Kara is the main protagonist in Barbie in Princess Power. She is played by Barbie and voiced by Kelly Sheridan. Kara is a modern princess who wished to do more important things for her kingdom, and one day, she is kisses by a magic butterfly. The butterfly gives Kara super powers, so she develops a secret crime-fighting alter ego named Super Sparkle. The butterfly also kisses Kara's jealous cousin, Corinne, who becomes Kara's nemesis, Dark Sparkle.