Moonbeam lives in the magical land of Glaucio. She is the daughter of Fiona, lead mare of the main herd in the land. When Fiona is brutally killed by Abaddon, Moonbeam is thrust into command of the herd. She must battle against Abaddon and his evil forces using her innocence and a gift from Stardust. Abaddon wishes to kill Stardust, the stallion in charge of all the land. Moonbeam and her friend, Comet, must fight together with mares and stallions of other herds to prevent this. If Abaddon succeeds, the land of Glaucio will be cast into 300 years of darkness, evilness and despair.