Sparkle, a baby unicorn, has a smaller horn than the other unicorns, and some kids make fun of her. Her best friend, Rainbow, supports her always. Sparkle joins a magic school to learn magic, but struggles initially. Then, she discovers that her magic was taken by her evil grandmother, the Dark Queen. Sparkle and Rainbow bravely go on an adventure to get Sparkle's magic back. They face many challenges, but with courage and friendship, they defeat the Dark Queen. Sparkle's magic returns, and she becomes a powerful unicorn. Everyone now celebrates Sparkle, and she even becomes a princess, staying close with Rainbow. They live happily after.