It was supposed to be the happiest day of Princess Cadence and Shining Armors life, but when one Cadence turns out to be a Changeling and the other has been trapped underground for days all hell breaks loose. With Changelings attacking Canterlot and Ponykind in need of a hero it is up to the legendary Taco Walker, Juan, to save the day, now armed with spicier tacos and a bigger cart to serve them with.