Time passes and young Anna asks Elsa once again, “Do You Want to Build a Snowman.” She misses her and does not know why they don’t get to hang out anymore. Time passes and a slightly older Anna continues to ask Elsa to hang out with her and describes how bored she has become. Elsa is struggling with controlling her powers. Her parents travel away to try and find answers, and they get into a shipwreck on their journey and pass away. Time passes again, and adult Anna continues to try and make a connection with her sister, who continues to feel isolated by her powers.

It is Elsa’s coronation day, and Anna is incredibly excited to have people back in the castle, throw a big party, and meet people “For The First Time in Forever.” Elsa on the other hand, is very nervous about becoming queen and worries about her ice powers being exposed. During the festivities, Anna literally runs into Prince Hans of the Southern Isles, and they immediately hit it off. Anna apologizes for being awkward and overly excited since she has had such a sheltered life, but Hans shares that he too is clumsy and the 13th son in line for the throne of his kingdom. Through her nerves and doubts, Elsa completes the coronation ceremony and becomes queen of Arendelle.

At the party, Anna and Elsa connect and bond over their excitement over the party, chocolate, and getting out of dancing with The Duke of Weselton, one of Arendelle’s trading partners who suspects something strange is happening in the palace. When Anna asks Elsa if they can keep the gates open, she is quickly shut down. Hans swoops in on her sadness and the two of them bond over their similarities and shared interests, because “Love is an Open Door.” Hans proposes and Anna says yes. The two of them ask for Elsa’s blessing, and she does not approve because “You can’t marry a man you just met.” Elsa decides the party is over and shuts the gates. Anna is frustrated, and in her frustration takes off one of Elsa’s gloves. They argue more, and Elsa can no longer hide her ice powers and exposes them in front of all of the party guests.

Elsa runs away and, in her panic, freezes all of Arendelle. Anna decides to chase after her and leaves Hans in charge while she is gone. At the foot of the mountain, Kristoff, an ice harvester, and his “talking” reindeer, Sven, are frustrated that their job is no longer useful. But they remind themselves that they have each other and that “Reindeer Are Better Than People.” A very cold and disheveled Anna finds them and lets them know that she is trying to find her sister. They agree to help her reach the North Mountain, and Kristoff is also shocked that Anna agreed to marry a man she just met. As they travel up the mountain, they playfully fight with each other, “What Do You Know About Love?”

As they continue their journey, they run into Olaf, the snowman the sisters made when they were kids, who is now alive. Before he can take them to where Elsa is, he describes how happy he would be “In Summer.” Back in Arendelle, Hans is trying to keep the townspeople warm and safe, while the Duke of Weselton is spreading fear and mistrust of the sisters. After finding Anna’s frozen dress, Hans leads a group of people to rescue her, but the Duke has more sinister plans for Elsa. While everyone is trying to reach her on the mountain or in Arendelle, Elsa is coming into her own powers and self-confidence. She realizes that she shouldn’t be hiding herself or her potential, she has to “Let It Go.”

Kristoff and Anna stumble upon “Wandering Oaken’s Trading Post and Sauna” and Oaken and his family explain to them the comfy and cozy concept of “Hygge!” Along with Olaf and Sven, the pair make it to Elsa’s gorgeous ice palace. The sisters reconnect and Anna learns the truth about their past and still wants a connection to Elsa, who is afraid she will hurt her again. In her frustration and fear, Elsa accidentally creates another storm and blasts Anna in the chest and then pushes the group out of her palace.

Kristoff calls for the Hidden Folk, who helped raise him and Sven, to help Anna’s rapidly turning white hair and plummeting cold temperature. They immediately assume that he and Anna are together and doesn’t understand why they aren’t, even if he is a bit of a “Fixer Upper.” In all of their celebration, they do not realize that Anna is injured, and she faints. Pabbie realizes she has a frozen heart, which can only be taken away by true love, so they take her back to Hans. He and the other volunteers storm Elsa’s ice palace and take her hostage while she struggles with overcoming and accepting what she has done, and that she is not a “Monster.”

Anna finally gets to Hans in the palace and asks him to kiss her to save her, but he reveals he does not love her. He did everything to try and take the throne. He plans to fake their marriage so that when Elsa and Anna are gone, he takes complete power. She waits in the empty cold palace, and Olaf sneaks in and builds a fire to help her stay warm, even though it hurts him because “some people are worth melting for.” Olaf shows Anna that Kristoff is really the one who loves her and is on his way back to help her.

Hans announces that Anna was killed by Elsa and that they got married, leaving him in charge. In a blizzard that gets “Colder by the Minute,” Anna is trying to reach Kristoff, Elsa escapes her shackles and is told by Hans that Anna is dead. Before he kills Elsa, Anna steps in between them and freezes fully. After a moment of sadness shared by all, Anna begins to thaw, because the real act of true love was their sisterhood. Elsa realizes that love is the key to undoing all that has happened and begins to thaw Arendelle. Anna goes to Kristoff and kisses him, then she stands up to Hans and punches him in the face. All of the townspeople understand what happened and honor Elsa as their queen, who can now freely use her powers. Everyone agrees to fill their world with “light and love.”