The Evil Queen is once again free, and she has a trap ready for Prince Wendell of the Nine Kingdoms. Her dog transforms into Prince Wendell and Prince Wendell becomes a dog. The real Prince Wendell accidentally falls through a magic mirror into the 10th kingdom - New York City. Now Virginia and Tony Lewis - average working schmoes - have been thrust into the situation and must travel to a hidden fantasy world to help Prince Lewis return to his true form.

Prince Wendell's aides are beginning to suspect that something is amiss with the prince's absence, just weeks from his coronation. The Huntsman has captured Virginia under orders from the Evil Queen, and Tony and the Wolf save her. They find a village with the magic mirror that will take them home, but Wolf is captured and put on trial for attacking local sheep.

Prince Wendell's coronation is cancelled due to his absence, as unbeknownst to his kingdom, he is still trapped as a dog and traveling with Virginia and Tony Lewis. To their horror, the imposter Prince Wendell arrives to be crowned king and the forces of the Evil Queen chase the true Wendell deep into the wilderness. Even worse, the magic mirror needed to return to New York has shattered.

The imposter Prince Wendell, a puppet of the Evil Queen, is about to be crowned king. The ghost of Snow White reveals to Virginia that she is destined to save the nine kingdoms. They sneak into the ball and make plans to expose the fake prince as an imposter and turn the real Wendell back into a human. The fate of the kingdoms are in the balance.