Anna, a fearless optimist, sets off on an epic journey - teaming up with rugged mountain man Kristoff and his loyal reindeer Sven - to find her sister Elsa, whose icy powers have trapped the kingdom of Arendelle in eternal winter. Encountering Everest-like conditions, mystical trolls and a hilarious snowman named Olaf, Anna and Kristoff battle the elements in a race to save the kingdom. From the outside Anna's sister, Elsa looks poised, regal and reserved, but in reality, she lives in fear as she wrestles with a mighty secret-she was born...