Elsa, princess of Arendelle, possesses cryokinetic powers, with which she is able to produce ice, frost, and snow at will. One night while playing, she accidentally injures her younger sister, Anna. The king and queen seek help from the troll king, who heals Anna and removes 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 quickly 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 her and Anna's childhood snowman, Olaf, to life. Meanwhile, Anna sets out in search of her sister, determined to return her to Arendelle, end the winter, and mend their relationship. When obtaining supplies, she meets an iceman named Kristoff and his reindeer, Sven, and convinces Kristoff to guide her up the North Mountain. On their journey, the group encounter 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 her powers lash out, accidentally striking Anna in the heart. Horrified, Elsa creates a giant snow creature to drive Anna, Kristoff, and Olaf away from her palace. As they flee, Kristoff notices Anna's hair turning white, and deduces that something is very wrong. He seeks help from the trolls, his adoptive family, who explain that Anna's heart has been frozen by Elsa. Unless it is thawed by an "act of true love", she will become frozen solid forever. Believing that only Hans can save her with a true love's kiss, 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 in Arendelle. There, Hans pleads with her to undo the winter, but Elsa confesses that she does not 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 is 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, telling her Anna is dead because of her. In Elsa's despair, the storm suddenly ceases, giving Kristoff and Anna the chance to find each other. However, Anna, seeing that Hans is about to kill Elsa, throws herself between the two just as she freezes solid, blocking Hans' attack.
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 thaws the kingdom and 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, while 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.
- The events of the original Frozen are implied to have happened in the backstory the same way they did in the movie. The Frozen storyline in Once Upon a Time's fourth season takes place two years after the events of the film.
- Elsa is named the Ice Queen rather than the Snow Queen in promotional materials because there is another character who goes by that name.
- Two of Hans' brothers, who were unseen in the film, appear on the show, and they are named Franz and Jurgen.
- The Snow Queen, Ingrid, is Anna and Elsa's aunt through the sisters' mother Gerda. Out of Ingrid and Gerda, they also have a middle sister named Helga. Therefore, Elsa inherited ice magic from her mother's side of the family.
- Queen Iduna is now named Gerda.
- Olaf is referred to in "Rocky Road", but he doesn't appear.
- The storyline featuring the Frozen characters is not considered canon in regards to Frozen 2. Jennifer Lee, who wrote the screenplay for the sequel, notes "No, that’s not canon. We didn’t see it. So I kinda made a point of certain things not to see so it wouldn’t affect us that way. Frozen 1 and Frozen 2 to me are one complete story and that’s really where we stay. So glad they had fun with that. I think they had a lot of fun with the characters."
- Queen Gerda is the hereditary monarch of Arendelle, not her husband. Frozen 2 establishes that it was the king.
|Original Character||Adapted as||First Featured in|
|Elsa||Elsa||"There's No Place Like Home"|
|Anna||Anna||"A Tale of Two Sisters"|
|The Duke of Weselton||The Duke of Weselton||"The Snow Queen"|
|Grand Pabbie||Grand Pabbie||"A Tale of Two Sisters"|
|Hans' Brothers||Hans' Brothers||"Rocky Road"|
|King of Arendelle||King of Arendelle||"A Tale of Two Sisters"|
|Kristoff||Kristoff||"A Tale of Two Sisters"|
|Marshmallow||A snowman (replica)||"A Tale of Two Sisters"|
|Queen of Arendelle||Gerda||"A Tale of Two Sisters"|
|Rock trolls||Rock trolls||"A Tale of Two Sisters"|
|Sven||Sven||"A Tale of Two Sisters"|
|Original Location||Adapted as||First Featured in|
|Arendelle||Arendelle||"A Tale of Two Sisters"|
|Southern Isles||Southern Isles (mentioned)||"Rocky Road"|
|Weselton||Weselton (mentioned)||"The Snow Queen"|
|Arendelle castle||Arendelle castle||"A Tale of Two Sisters"|
|Arendelle docks||Arendelle docks||"A Tale of Two Sisters"|
|Ice palace||Ice palace (mentioned)||"Rocky Road"|
|Wandering Oaken's Trading Post and Sauna||Wandering Oaken's Trading Post||"Family Business"|
|Valley of the Living Rock||Rock trolls valley||"A Tale of Two Sisters"|
|Original Item||Adapted as||First Featured in|
|Elsa's gloves||Concealing gloves||"There's No Place Like Home"|
|Royal ship||Royal ship||"A Tale of Two Sisters"|
- ↑ "A Tale of Two Sisters", Once Upon a Time, ABC.
- ↑ Marshall, Andrew (September 30, 2019). Frozen 2: Once Upon A Time's Frozen Season Isn't Canon. Screen Rant. “"No, that’s not canon. We didn’t see it. So I kinda made a point of certain things not to see so it wouldn’t affect us that way. Frozen 1 and Frozen 2 to me are one complete story and that's really where we stay. So glad they had fun with that. I think they had a lot of fun with the characters."”
- ↑ screenshot) (February 28, 2015). "Is any monster made of snow ever the same as the original? This was my problem with Frosty the Snowman when I was a kid." (
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