The Summer Sun Celebration is about to begin, and Twilight Sparkle and her friends have been invited to stay at the palace for the festivities. There is something different about this year though… Unusual ponies are seen in Canterlot and strange occurrences have been reported. An ominous wind blows through the air as Shining Armor attempts finish his tour of duty as captain of the Royal Guard and comes face to face with an enigmatic gray stallion.

Dark happenings loom on the horizon.