Beaten, but not gone, Queen Chrysalis decides to play her hand in a desperate attempt to take over Equestria. This plan involves creating a changeling unlike any other, a self-sufficient pony with the goal of overpowering the Elements of Harmony and the Equestrian princesses. However, Pox turns out to be harder to control and while masquerading as a Night Guard, Pox finds himself expressing an interest toward the Princess of the Moon. Can Luna convince Pox to ignore his given purpose, or will he overthrow the peace?