A meteor impacts the nation of Equestria, Planet Equis. Tranquility is quickly snuffed out when a poison begins to spread violently. The Princesses cannot combat this unknown threat, as no knowledge of it exists. Help comes from an unexpected source.
Ridley, the dreaded leader of the Space Pirates, was finally put rest after his battle with Samus Aran, on planet Zebes, but after being cloned on the B.O.T.T.L.E ship, a reject clone was sent in a pod to a far off planet, Equestria.