While in school, the Cutie Mark Crusaders find out that everything they have believed about Santa Claws may be just a lie told by their families. Determined to learn the truth, the girls agree to stay up on Hearth's Warming Eve. That night, Apple Bloom is shocked to find a mysterious train magically appear on her front lawn. She takes an extraordinary train ride up north, and embarks on a journey of discovery that wonderful things come to ponies who believe.

This i a parody of "The Polar Express" by Chris Van Allsburg