While Dora and Boots are looking up at the stars, they see a dragon, a castle, and some beautiful crystal constellations. When Boots notices that Dora's crystal looks like the one in the sky, the crystal constellations, Dora's necklace, and even her storybook begin to glow. The storybook's pages turn, magically stopping on the Crystal Kingdom story. What will happen next?

When a prophecy traps a kingdom in eternal winter, Anna, a fearless optimist, teams up with extreme mountain man Kristoff and his sidekick reindeer Sven on an epic journey to find Anna's sister Elsa, the Snow Queen, and put an end to her icy spell. Encountering mystical trolls, a funny snowman named Olaf, Everest-like extremes and magic at every turn, Anna and Kristoff battle the elements in a race to save the kingdom from destruction.