Born with the ability to control ice, Queen Elsa of Arandelle has always considered those talents as a curse after she accidentally hurt her sister Anna with it. Now, she's locked herself up, away from everyone, afraid to hurt her again..........afraid to hurt all of those people important to her.......forced to be as cold as ice. Who could help her overcome this fear, who can thaw her frozen heart?

The Guardians are alerted by Pitch's second return in a kingdom called Arendelle. The kingdom, already under Pitch's rule, has a queen - who has already been corrupted by Pitch's darkness - named Elsa. The power of the two combined are too much for the Guardians and they come to the conclusion that the only antidote to the problem is sending Jack back in time to find a single moment in the whole of Elsa's life where the entire course of events leading to the present can be changed so that the future of the Earth and all the people in it may be saved.

Elsa had always been told to keep her powers secret. That's all she ever knew was to hide and shut the world out. How could she ever let anyone in? And Jack, who has been searching his whole life to let someone in, to believe in him. With Jack's help, can Elsa finally be able to Let It Go?