Frozen

Princess Elsa of Arendelle has naturally occurring magical powers, allowing her to create ice and snow. After she accidentally injures her younger sister Anna with her magic, their parents bring them to a colony of trolls led by Grand Pabbie. He heals Anna and erases her memories of Elsa's magic. The king and queen decide that until Elsa learns to control her powers, they will close the castle gates and isolate her. Years of isolation create a rift between the sisters and, when they are adolescents, their parents die in a shipwreck.
On Elsa's coronation day, the castle gates open to the public for the first time. Visiting dignitaries include the handsome Prince Hans of the Southern Isles, with whom Anna falls in love at first sight. Hans proposes to Anna, but Elsa objects to the marriage and lashes out, accidentally revealing her powers to the terrified court. Accused of witchcraft by the scheming Duke of Weselton, Elsa flees to the North Mountain and feels free for the first time. She builds an ice palace and decides to live a hermit's life, unaware that her magic has plunged Arendelle into an eternal winter.
Anna ventures out to find Elsa, leaving Hans in command. She meets an ice courier named Kristoff and his reindeer, Sven, and convinces them to bring her to the North Mountain. On the way they meet Olaf, a living snowman created by Elsa's magic, who agrees to guide them. At the ice palace, Anna tells Elsa about what has become of Arendelle. Elsa's fear makes her accidentally hit Anna with ice again, freezing her heart. Unknowing of this, Elsa creates a giant snow monster in desperation and casts Anna out of the castle to keep her safe.
With Anna slowly freezing to death, Kristoff takes her to the trolls for help. Grand Pabbie says that only "an act of true love" can thaw her heart. Kristoff and Olaf race Anna back to the castle so Hans can give her a true love's kiss. Meanwhile, Hans defeats the giant snow monster and imprisons Elsa, after a fight between her and the Duke of Weselton's bodyguards. Instead of kissing Anna, Hans reveals that he has been plotting to become ruler of Arendelle by marrying her and then killing Elsa, leaving Anna to freeze to death. The sisters escape, and Olaf helps Anna reunite with Kristoff, whom he has inferred is in love with Anna.
Hans confronts Elsa, saying that she has killed Anna. Elsa breaks down, which abruptly stops the extreme blizzard she recently created. Seeing Hans about to kill Elsa, Anna sacrifices her chance to be saved by Kristoff and steps between Elsa and Hans. She freezes solid, which devastates Elsa. As she hugs her sister, Anna slowly thaws; her heroism is "an act of true love". Realizing that love is the key to controlling her powers, Elsa ends the winter. Hans is arrested and exiled for treason and attempted assassination. Kristoff is appointed the royal ice deliverer, and he and Anna share a kiss. The sisters mend their relationship, and Elsa promises never to lock the castle gates again.