It's been a few weeks into winter, and Elsa can't shake the feeling that she's been getting. With help from Anna and Kristoff, she finds her childhood hero: Jack Frost. However, no one can see Jack unless they believe in him. With much in common, Jack and Elsa grow close to each other and everything seems perfect. That is, until both of their pasts come back. One thing leads to another, and soon, the only thing that can save the day is the Kingdom of Arendelle. The citizens must drop all of their fears and believe in Jack and the Guardians or else fear will take control of them all.