Perhaps part of the reason Disney movies resonate with audiences is because they're based on material that's familiar, relatable, and even profound. So many Disney animated movies, like Sleeping Beauty, Snow White and the Seven Dwarfs, Mulan, and Cinderella, have scripts based on really old folk tales, legends, and fairy tales. Frozen is based on Snedronningen, or The Snow Queen, a fairy tale-type story first published in its original, Danish language form in 1844. The author: Hans Christian Andersen, who also wrote the source material for another Disney classic, The Little Mermaid. He lay the narrative groundwork for Frozen, but Frozen II was created entirely by modern-day screenwriters imagining new adventures for the characters inspired by Andersen's. The author's presence is still felt in Frozen II, however — at one point, as an affectionate passing reference. Toward the end of the movie, audiences see a flashback to when Elsa and Anna's parents — Iduna and Agnarr — were children. Iduna runs over to Agnarr and inquires about the book in which he's happily engrossed. He explains it's "a new Danish author." He means Hans Christen Anderson.