When Starlight Glimmer finds a mysterious item, it sends her, her teacher and her friends to a mysterious new world. Adrift in this new place and changed into something else entirely, the seven mares will need the help of this world residents to find a way home, and to save one of their own when she is taken by aggressive forces for a some purpose.

However, as the group travel this new world, they begin to unravel a mystery, one that if not stop could spell the end, not only to this world, but maybe Equrestia as well.