Old Thunder was a sailor all his life. As the years pass by, he grows ever more restless about finding his own harbor. One fateful night in a tavern he meets one very pink mare that might change his view on things.
Glitter was banished from her hive because she's different: instead of feeding on love, she feeds on anger, fear, and sadness. Living among ponies, she spreads misery in her neighbourhood, until one stallion changes her life forever.
After being banished for casting a spell on ponies in a fit of madness, Cadence returns. Only by serving ponykind will she be able to regain the trust of her loved ones. Equestria seems as prosperous as ever... but its ruler is acting strangely.