Lucía is not happy with the way she looks. The fairies decide to help her and send Roberta—an absentminded fairy with a big heart—to her aid. Roberta dutifully accompanies Lucía wherever she goes, but she does more harm than good with her mistaken spells and her stubbornness. Despite it all, Roberta the Fairy is finally able to show Lucía that she is beautiful and one-of-a-kind.