After the kingdom of Arendelle is cast into eternal winter by the powerful Snow Queen Elsa (voice of Idina Menzel), her sprightly sister Anna (Kristen Bell) teams up with a rough-hewn mountaineer named Kristoff (Jonathan Groff) and his trusty reindeer Sven to break the icy spell. Chris Buck and Jennifer Lee co-directed this Walt Disney Animation Studios production based on Hans Christian Andersen's beloved fairy tale The Snow Queen.