Frozen is a 2013 American 3D computer-animated musical fantasy-comedy film produced by Walt Disney Animation Studios and released by Walt Disney Pictures. It is the 53rd animated feature in the Walt Disney Animated Classics series. Inspired by Hans Christian Andersen's fairy tale The Snow Queen, and featuring the voices of Kristen Bell, Idina Menzel, Jonathan Groff, Josh Gad, and Santino Fontana, the film tells the story of a fearless princess who sets off on an epic journey alongside a rugged, thrill-seeking mountain man, his loyal pet reindeer, and a hapless snowman to find her estranged sister, whose icy powers have inadvertently trapped the kingdom in eternal winter.
The film underwent several story treatments for several years, before being commissioned in 2011, with a screenplay written by Jennifer Lee, and both Chris Buck and Lee serving as directors. Christophe Beck, who had worked on Disney's award-winning short Paperman, was hired to compose the film's orchestral score, while husband-and-wife songwriting team Robert Lopez and Kristen Anderson-Lopez penned the songs.
Frozen premiered at the El Capitan Theatre on November 19, 2013, and went into general release on November 27. The film has so far grossed $1.049 billion in worldwide box office revenue, $397 million of which has been earned in the United States and Canada; it was met with widespread critical acclaim, and several film critics considered it to be the best Disney animated musical since the studio's renaissance era. The film won two Academy Awards for Best Animated Feature and Best Original Song ("Let It Go"), the Golden Globe Award for Best Animated Feature Film, the BAFTA Award for Best Animated Film, five Annie Awards (including Best Animated Feature), and two Critics' Choice Awards for Best Animated Feature and Best Original Song ("Let It Go").
Elsa, princess of Arendelle, possesses the magical ability to create ice and snow. One night while playing, she accidentally injures her younger sister, Anna. The king and queen seek help from trolls, who heal Anna and remove her memories of Elsa's magic. The royal couple isolates the children in their castle until Elsa learns to control her powers. Afraid of hurting Anna again, Elsa spends most of her time alone in her room, causing a rift between the girls as they grow up. When the girls are teenagers, their parents die at sea during a storm.
When Elsa comes of age, the kingdom prepares for her coronation. Among the guests is the Duke of Weselton, who seeks to exploit Arendelle for profit. Excited to be allowed out of the castle again, Anna explores the town and meets Prince Hans of the Southern Isles, and the two immediately develop a mutual attraction. Despite Elsa's fear, her coronation goes off without incident. During the reception, Hans proposes and Anna hastily accepts. However, Elsa refuses to grant her blessing and forbids their sudden marriage. The sisters argue, culminating in the exposure of Elsa's abilities during an emotional outburst.
Panicking, Elsa flees the castle, while inadvertently unleashing an eternal winter on the kingdom. High in the nearby mountains, she casts off restraint, building herself a solitary ice palace, and unknowingly brings to life her and Anna's childhood snowman, Olaf. Meanwhile, Anna sets out in search of her sister, determined to return her to Arendelle, end the winter, and mend their relationship. While obtaining supplies, she meets mountain man Kristoff and his reindeer Sven. She convinces Kristoff to guide her up the North Mountain. The group then encounters Olaf, who leads them to Elsa's hideaway.
Anna and Elsa reunite, but Elsa still fears hurting her sister. When Anna persists in persuading her sister to return, Elsa becomes agitated and accidentally strikes Anna in the heart with her powers. Horrified, Elsa creates a giant snow creature to drive Anna, Kristoff, and Olaf away. As they flee, Kristoff notices Anna's hair is turning white, and deduces something is very wrong. He seeks help from the trolls, his adoptive family, who explain that Anna's heart has been frozen. Unless it is thawed by an "act of true love", she will become frozen solid forever. Believing that only Hans can save her, Kristoff races back with her to Arendelle.
Meanwhile, Hans, leading a search for Anna, reaches Elsa's palace. In the ensuing battle against the Duke's men, Elsa is knocked unconscious and imprisoned back at the kingdom. There, Hans pleads with her to undo the winter, but Elsa confesses she doesn't know how. When Anna reunites with Hans and begs him to kiss her to break the curse, Hans refuses and reveals that his true intention in marrying her was to seize control of Arendelle's throne. Leaving Anna to die, he charges Elsa with treason for her younger sister's apparent death.
Elsa escapes and heads out into the blizzard on the fjord. Olaf finds Anna and reveals Kristoff is in love with her; they then escape onto the fjord to find him. Hans confronts Elsa and tells her Anna is dead because of her. In Elsa's despair, the storm suddenly ceases, giving Kristoff and Anna the chance to reach each other. However Anna, seeing that Hans is about to kill Elsa, decides to throw herself between the two and subsequently freezes solid, blocking the blow.
As Elsa grieves for her sister, Anna begins to thaw, since her decision to sacrifice herself to save her sister constitutes an "act of true love." Realizing love is the key to controlling her powers, Elsa is able to thaw the kingdom and even helps Olaf survive in summer. Hans is sent back to the Southern Isles to face punishment for his crimes against the royal family of Arendelle, and Elsa cuts off trade with Weselton. Anna and Kristoff share a kiss, and the two sisters reconcile; Elsa promises never to shut the castle gates again.