When their kingdom becomes trapped in perpetual winter, fearless Anna joins forces with mountaineer Kristoff and his reindeer sidekick to find Anna's sister, Snow Queen Elsa , and break her icy spell. Although their epic journey leads them to encounters with mystical trolls, a comedic snowman, harsh conditions, and magic at every turn, Anna and Kristoff bravely push onward in a race to save their kingdom from winter's cold grip.