Elsa (Idina Menzel), princess of Arendelle, has powers the power of snow and ice. But one night, while playing with her little sister Anna (Kristen Bell), Elsa accidentally injures her sibling. The king and queen seek help from trolls, whose leader, Grand Pabbie (Ciaran Hinds), heals Anna and erases her memories of her sister’s powers. Deciding to keep their daughter’s dangerous gift hidden until she learns to control it, the royal family lock themselves away inside their castle. Elsa, scared she’ll hurt someone again, spends most of her time alone in her room, creating a rift between the two sisters as they grow up. As teenagers, their parents die traveling across the sea during a storm. Anna, believing herself to be the reason Elsa isolates herself, tries to regain her sister’s affections, to no avail. Three years later, the people of Arendelle prepare for Elsa’s summer coronation. Among the visiting dignitaries is the Duke of Weselton (Alan Tudyk), a tradesman who wants to exploit Arendelle for profit. Excited that the castle’s gates are open to the public for a day, Anna explores the town and meets Prince Hans (Santino Fontana) of the Southern Isles, with the pair quickly developing a mutual attraction. After an incident free coronation, during the reception Hans proposes to Anna, who hastily accepts. Elsa refuses to grant her blessing, setting off an argument between the sisters, which leads to her abilities being exposed to everyone. Panicked, Elsa flees, inadvertently unleashing an eternal winter on the kingdom in the process. No longer held back by her fear of being discovered, she celebrates her powers, building herself an ice palace and unknowingly bringing to life her childhood snowman, Olaf (Josh Gad). Anna sets out in search of Elsa, determined to return her to Arendelle, end the winter, and mend their relationship. While getting supplies, she meets mountain man Kristoff (Jonathan Groff) and his reindeer Sven. Anna convinces Kristoff to guide her to the North Mountain in search of her sister. The group meets Olaf, who leads them to Elsa’s palace, where Anna must plead with her sister to bring back summer.