Princess Celestia has a mission so grand that it stretches far beyond Equestria's borders, into the unknown of the "Great Blue Seas". Anything can happen, but with "Red Hair" Shanks and his crew along for the ride, they're up for any challenge.
When a pirate named Captain Jack Silver steals the Elements of Harmony, it's up to Twilight and the rest of the Mane Six to get them back. Soon enough they all find themselves on a swashbuckling adventure to find the SEVENTH Element of Harmony.
Captain Rainbow Dash must seize the fabled Dead Stallion's Chest or else be sent to Spike Jones' Locker. Meanwhile, Shining Armor must find Rainbow Dash or else he and Cadence will be hung.