When Celestia sealed Nightmare Moon away, she left her kingdom to fend for itself for five long years. In that time, Equestria almost fell apart, but it was brought back together by four ponies willing to fight for it. Now, as the Knights of Friendship spread peace and harmony throughout the lands, a dangerous new threat emerges from Zebra lands.
Fueled by the same friendship that saved Equestria, a dark shadow threatens the world and it's again up to Heart Chase, Constance, Ridgeline, and Bard to lead the charge. But what happens when opposing friendships collide?