Elsa's sister in the movie 'FROZEN' is ANNA, a four letter word. ANNA is a brave and determined young woman who embarks on a journey to find her estranged sister Elsa, whose icy powers have trapped their kingdom in an eternal winter. Along the way, she meets Kristoff, a rugged mountain man, and his loyal reindeer Sven, and Olaf, a lovable snowman. Together, they embark on a journey to save their kingdom and find out the true meaning of family.