Rainbow Dash, one of the best rookie flyers in Equestria, a loyal friend, and the newest resident of Ponyville. She seems unstoppable, a cyan bolt of lightning tearing through her competition as she trains to join the Wonderbolts. One day, however, a stunt during training takes a horrifying turn as a brutal accident lands her in the hospital. She recovers to a clean bill of health physically, but she has suffered severe brain damage, and has forgotten most of her life. As she begins to recover her memories, a small orange Pegasus filly starts following her around, cheering Rainbow on when she performs her death-defying stunts and calling Rainbow her hero and idol. But why?
Well, little Scootaloo knows that one of the strongest bonds in the world is sisterhood.