The Masked Matterhorn. Fili-Second. Radiance. Mistress Marevelous. Zapp. Saddle Rager. Hum Drum. These seven heroes protect Maretropolis from all kinds of threats. They were as close as friends could be. That all would change when three of their most hated enemies team up against the Power Ponies and unleash a threat that no pony can stop. The Power Ponies' friendship will be put to the test when they are on the brink of the end.