In "Frozen," fearless optimist Anna (voice of Kristen Bell) teams up with rugged mountain man Kristoff (voice of Jonathan Groff) and his loyal reindeer Sven in an epic journey, encountering Everest-like conditions, mystical trolls and a hilarious snowman named Olaf (voice of Gad) in a race to find Anna's sister Elsa (voice of Menzel), whose icy powers have trapped the kingdom of Arendelle in eternal winter.