After she is saved from oblivion at the hands of Heaven's Exorcists by a masked stranger, Princess Octavia of the Ars Goetia finds herself wrapped up in a series of unforeseeable events, starting with a boat ride down the forgotten catacombs of Hell with her Feline-Saviour... whom she will eventually find to be quite the interesting fellow indeed.

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.