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.
A creature named Yoshi lands in Equestria with a problem on his hands. Can the Equestrians help him get back home and assist him with his problem, or will he be delayed by means out of (or perhaps within) his control?